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Hemiboea angustifolia (Gesneriaceae), a new species endemic to a tropical limestone area of Guangxi, China

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  • Guangxi Institute of Botany, CAS

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Hemiboea angustifolia, a new species of Gesneriaceae from Guangxi, China, is described and illustrated. The new species is morphologically similar to H. cavaleriei var. paucinervis and H. longgangensis, both found in southwestern Guangxi, China. A description of H. angustifolia, together with illustrations, a distribution map, habitat description, conservation assessment and a diagnostic comparison with H. longgangensis, H. cavaleriei var. cavalerieri and H. cavaleriei var. paucinervis are presented.
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Accepted by Hajo Esser: 3 Oct. 2011; published: 14 Oct. 2011 53
PHYTOTAXA
ISSN 1179-3155 (print edition)
ISSN 1179-3163 (online edition)
Copyright © 2011 Magnolia Press
Phytotaxa 30: 5359 (2011)
www.mapress.com/phytotaxa/Article
Hemiboea angustifolia (Gesneriaceae), a new species endemic to a tropical
limestone area of Guangxi, China
FANG WEN, WEN-XIU TANG & YI-GANG WEI*
Guangxi Inst. of Botany, Guangxi Zhuang Autonomous Region and Chinese Academy of Sciences, 541006, Guilin, China.
*Author for Correspondence. E-mail: wenfang0608@139.com, twx@gxib.cn, weiyigang@yahoo.com.cn
Abstract
Hemiboea angustifolia, a new species of Gesneriaceae from Guangxi, China, is described and illustrated. The new
species is morphologically similar to H. cavaleriei var. paucinervis and H. longgangensis, both found in southwestern
Guangxi, China. A description of H. angustifolia, together with illustrations, a distribution map, habitat description,
conservation assessment and a diagnostic comparison with H. longgangensis,H. cavaleriei var. cavalerieri and H.
cavaleriei var. paucinervis are presented.
Key words: Gesneriaceae, Guangxi, Hemiboea angustifolia, new species, taxonomy
Introduction
Hemiboea Clarke is a medium-sized genus of Gesneriaceae mostly occurring in China. Three taxa can also be
found in neighboring countries, namely H. cavaleriei var. paucinervis W.T.Wang & Z.Y.Li (in Li 1983) and H.
subcapitata Clarke (1888: sub tab. 1798) in northern Vietnam (Li & Wang 2004), and H. bicornuta (Hayata
1913: 154) Ohwi (1936: 662) in Iriomote-Shima of Ryukyu, Japan (Li 1996). The subtropical and tropical
areas of Guangxi, Guangdong, Yunnan and Guizhou are the most diverse regions in this genus (Li 1983,
1987). Recently, a Chinese endemic genus, Metabriggsia Wang (1983: 1), was revised and merged with
Hemiboea (Weber et al. 2011). The two species of Metabriggsia, M. ovalifolia (1983: 2) and M.
purpureotincta Wang (1983: 3), were combined to Hemiboea ovalifolia (W.T.Wang) A.Weber & Mich.Möller
and H. purpureotincta (W.T.Wang) A.Weber & Mich.Möller (in Weber et al. 2011). Thus, this genus
comprises at least 27 species and five varieties in China (Li & Wang 2004, Xu et al. 2010).
During the course of a floristic investigation in 2005, we collected a rare unknown species of Hemiboea
from a limestone area in Daxin County, Guangxi, which is different from all known species in having
glabrous, lanceolate leaves and few yellowish white flowers in a single cyme. It belongs to H. section
Subcapitatae Clarke (1888: sub tab. 1798). After consulting national floras and relevant literature (Li 1987,
Wang 1990, Wang et al. 1998, Li & Wang 2004, Wei et al. 2010), as well as herbarium specimens, we
concluded that our specimens represent a new species, which is described and illustrated here.
Taxonomic Treatment
Hemiboea angustifolia F.Wen & Y.G.Wei, sp. nov. (Fig. 1 & Fig. 2 A–F)
Haec species H. cavaleriei var. cavaleriei, H. cavaleriei var. paucinervi et H. longgangensi affinis, a quibus foliis
anguste lanceolatis vel lanceolatis, floribus majoribus, 4.85.4 cm longis, corollae tubis 3.64.0 cm longis, orificio
WEN, TANG & WEI54 Phytotaxa 30 © 2011 Magnolia Press
1.4–1.6 cm diametro, ovario (circa 13 mm longo) longiore, disco circa 2.2 mm alto, stigmate capitato, depresso
differt.
Type:—CHINA. Guangxi: Daxin County, Encheng Town, growing on the damp stones at the entrance of a
medium-sized karst caves where spring runs out from the opening, at evergreen broadleaf forest margins,
mostly on soils of limestone crevices somewhat rich in alkaline, altitude 162–170 m, 21 November 2008, F.
Wen & W.X. Tang 08112101 (holotype IBK!, isotypes PE!).
Perennial herb. Stems ascending, 40–80 cm high, 5–7 mm in diameter, rounded, glabrous, simple, with 10–12
nodes or more. Leaves opposite, ca 20, the lower ones commonly caducous; petiole 1–2 cm long, glabrous;
leaf blade subcarnose or thinly leathery, thickly herbaceous when dry, narrowly lanceolate to lanceolate, 10.5
16.5 × 1.5–4.4 cm, apex acute or acuminate, base narrowly cuneate, zygomorphic or slightly oblique, margin
entire, glabrous on both sides, lateral veins 5–7 on each side of midrib. Cymes subterminal or terminal, 3- or
more-flowered, peduncle 1.0–1.5 cm long, glabrous; involucre nearly spheroidal or cordate, 1.8–2.3 cm in
diameter, whitish green or pale yellowish green, glabrous. Pedicel ca 2.2–3.5 mm long, glabrous. Calyx white
or pale green, 5-parted from the base, lobes equal, lanceolate to narrowly triangular, 7.8–8.8 × 0.30–0.35 mm,
glabrous. Corolla outside greyish-white or waxy-white, adaxial light purple, inside brownish yellow, 4.8–5.4
cm long, adaxial outside glandular-puberulent, abaxial outside extremely short pubescent to nearly glabrous,
inside glabrous; tube 3.6–4.0 cm long, 1.4–1.6 cm in diameter at the orifice, ca 4.8–5.2 mm in diameter at the
base, inside with a ring of hairs adnate to 8.0–8.5 mm above the corolla base; limb distinctly 2-lipped, adaxial
lip 2-lobed, lobes oblate, 5.2–6.5 × 8.8–9.3 mm; abaxial lip 3-lobed towards the middle, lateral two lobes
rotund, 5.1–5.7 × 5.7–6.3 mm, central lobe oblate or oblate-oval, ca 5.7 × 9.2 mm. Stamens 2, adnate to ca
18.5–19.2 mm above the corolla base; filaments linear, geniculate from the middle, linear, glabrous; anthers
slightly elliptic, glabrous, 3.2–3.5 × 2.8–3.0 mm. Staminodes 2, glabrous, adnate to 17.0–18.1 mm above the
corolla base, 5.7–6.0 mm long with adherent capitate apex. Disc ring-like, ca 2.2 mm high, margin repand,
glabrous. Pistil 2.5–2.7 cm long; ovary linear, ca 13 mm long, 2.5–2.7 mm in diameter, glabrous; style ca 12–
14 mm long; stigma capitate, middle slightly depressed, ca 1.6 mm in diameter. Capsule linear, ca 3.0–3.5 cm
long, 3.5–4.0 mm in diameter, glabrous, slightly curved. Flowering in November, fruiting in December.
Distribution:CHINA (Endemic to Daxin County, SW Guangxi Autonomous Region) (see Map. 1).
Habitat & Ecology:Hemiboea angustifolia has been only found in Encheng Town, Daxin County,
Guangxi, China. The climatic type of type locality belongs tropical monsoon climate, the rainfall averages
1326 mm/year, and mean annual temperature was 21.3 °. The vegetation type of this region is special
evergreen tropical seasonal rain forest on limestone hills.
Etymology:The specific epithet refers to the narrow and linear leaves of this new taxon. The
morphology of the blade is obviously different from other species in this genus.
Conservation status:—According to the detailed information from our careful field investigation
surrounding the type area for five times in two years, the population size of this new species is fewer than 100
individuals, all at one site. They grow on the bottom of limestone cliff in a karst gorge. According to IUCN
red list categories (IUCN 2001, Pullin 2004), we therefore assess Hemiboea angustifolia as Critically
Endangered, CR B2ab (i, iii, v) + C2a (ii).
Vernacular name:—CHINA: pizhenye banshuojutai.
Additional specimens examined (paratype):—CHINA. Guangxi: Daxin County, Encheng Town, same
locality as type, 21 November 2010, F. Wen & W.X. Tang 10112112 (IBK!).
Hemiboea angustifolia is a member of H. sect. Subcapitatae and is similar to H. cavaleriei var. cavaleriei, H.
cavaleriei var. paucinervis and H. longgangensis, but differs by narrowly lanceolate to lanceolate, larger
greyish-white or waxy-white flowers (4.8–5.4 cm long; tube 3.6–4.0 cm long, 1.4–1.6 cm in diameter at the
orifice, 4.8–5.2 mm in diameter at the base), longer pistil and ovary, higher disc and capitate stigma slightly
depressed in the middle. The morphology of these taxa, one as a variety, is summarized in Table 1.
Phytotaxa 30 © 2011 Magnolia Press 55
HEMIBOEA ANGUSTIFOLIA (GESNERIACEAE), A NEW SPECIES
TABLE 1. Morphological comparison between Hemiboea angustifolia, H. longgangensis, H. cavaleriei var. cavaleriri
and H. cavaleriei var. paucinervis.
Characters H. angustifolia H. longgangensis H. cavaleriei var.
cavaleriei H. cavaleriei var.
paucinervis
Leaf blade
shape narrowly lanceolate to
lanceolate narrowly elliptic-
lanceolate oblong lanceolate, ovate
lanceolate or elliptic
elliptic to ovate or broadly
lanceolate, sometimes
falcate; margin entire or
sparsely serrate
Leaf blade
size 10.5–16.5 × 1.5–4.4 cm 6–13.5 × 2–4 cm 5–20 × 2–8 cm 5–20 × 2–8 cm
Pubescence
of leaf
blade glabrous on both sides adaxially sparsely
pubescent, abaxially
glabrous
adaxially sparsely
pubescent, abaxially
glabrous, only sparsely
pubescent on the veins
adaxially usually glabrous,
rarely sparsely pubescent
Peduncle 1.0–1.5 cm long, outside
glabrous 1–2 cm long, outside
glandular pubescent 0.5–6.5 cm long, glabrous 0.5–6.5(–10.0) cm long,
outside glabrous
Leaf lateral
veins 5–7 on each side of midrib 5–6 on each side of midrib 6–14 on each side of
midrib 4–8(–9) on each side of
midrib
Involucre 1.8–2.3 cm in diameter,
glabrous
ca. 1 cm in diam., outside
sparsely glandular-
pubescent
1.0–2.5 cm in diam., apex
uspidate, outside
glabrous
1.0–2.5 cm in diam.,
outside glabrous
Corolla
size
4.8–5.4 cm long; tube 3.6–
4.0 cm long, 1.4–1.6 cm in
diameter at the orifice,
4.8–5.2 mm in diameter at
the base
ca. 2.4–3.0 cm long; tube
ca. 2.4 cm, ca. 1 cm in
diameter at the orifice, ca.
4 mm in diameter at the
base
3.0–4.8 cm long; tube 2.3
3.3 cm, 1.3–1.5 cm in
diameter at the orifice, 6–
8 mm in diameter at the
base
3.0–4.8 cm long; tube 2.3
3.3 cm, 1.3–1.5 cm in
diameter at the orifice, 6–8
mm in diameter at the base
Corolla
lobes
adaxial lip lobes oblate,
5.2–6.5 × 8.8–9.3 mm;
abaxial lateral two lobes
rounded, 5.7–6.3 × 5.1–
5.7 mm, central oblate or
oblate-oval, ca. 5.7 × 9.2
mm
adaxial lip lobes ovate, ca.
3.5 mm, abaxial lip lobes
broadly ovate, ca. 6 mm
adaxial lip lobes
semicircular, 6–10 mm,
abaxial lip lobes broadly
ovate, 7–15 mm
adaxial lip lobes
semicircular, 6–10 mm,
abaxial lip lobes broadly
ovate, 7–15 mm
Hair ring in
the corolla adnate to 8.0–8.5 mm
above the corolla base adnate to ca. 3.5 mm
above the corolla base adnate to 4.0–6.0 mm
above the corolla base adnate to 4.0–6.0 mm
above the corolla base
Stamens adnate to 18.5–19.2 mm
above the corolla base;
anthers slightly elliptic
adnate to ca. 9 mm above
the corolla base; anthers
elliptic
adnate to 10–15 mm
above the corolla base,
narrowly linear, anthers
elliptic
adnate to 10–15 mm above
the corolla base; anthers
nearly rotund
Stami-
nodes
2, glabrous, adnate to
17.0–18.1 mm above the
corolla base, 5.7–6.0 mm
long with adherent
capitate apex
3, glabrous, laterally
adnate to ca. 12 mm above
the corolla base, ca. 7 mm
long, the central one
linear, ca. 1.2 mm long
3, lateral 5–7 mm long,
apex capitate, the central
one (if existent) small, ca.
2 mm long, apex truncate
2, rarely 3, lateral 5–7 mm
long, apex capitate, the
central one (if existent)
small, ca. 2 mm long, apex
truncate
Pistil 3.5–3.7 cm long, glabrous ca. 1.8 cm long, sparsely
glandular puberulent 1.7–2.5 cm long, glabrous, 1.7–2.5 cm long, glabrous,
Disc ca. 2.2 mm high ca. 0.9 mm high 1.0–1.2 mm high 1.0–1.2 mm high
Ovary ca. 13 mm long, glabrous 6–8 mm long, sparsely
glandular puberulent linear ca. 6 mm long, glabrous
Stigma capitate, slightly
depressed in the middle slightly swollen, truncate obtuse Obtuse
Capsule linear, ca 3.0–3.5 cm long,
glabrous, slightly curved linear lanceolate, 2.0–2.5
cm long linear lanceolate, curved,
1.5–2.5 cm long linear lanceolate, curved,
1.5–2.5 cm long
WEN, TANG & WEI56 Phytotaxa 30 © 2011 Magnolia Press
FIGURE 1. Hemiboea angustifolia. A) habit; B) corolla opened with stamens and staminodes; C) stamens; D) pistil with
opened calyx; E) stigma; F) transverse section of ovary. Drawn from F.Wen & W.X.Tang 08112101.
Phytotaxa 30 © 2011 Magnolia Press 57
HEMIBOEA ANGUSTIFOLIA (GESNERIACEAE), A NEW SPECIES
FIGURE 2. A–F) Hemiboea angustifolia. A) Habit; B) Involucre; C) Flowers; D) Buds; E) Top view of cyme; F)
Opened flower. GH) Hemiboea longgangensis. G) Habit; H) Flower. IJ) Hemiboea cavaleriei var. paucinervis. I)
Habit; J) Involucre and flowers.
WEN, TANG & WEI58 Phytotaxa 30 © 2011 Magnolia Press
MAP 1. Distribution of Hemiboea angustifolia and related taxa. A) Known distribution of H. angustifolia; B) Oval area,
distribution of H. cavaleriei var. paucinervis; C) Known distribution of H. longgangensis; D) Oval dotted line area,
distribution of H. cavaleriei var. cavaleriei
Acknowledgements
The authors are grateful to Yun-Xi Zhu (IBK) for the pretty drawing, H.-J. Esser (M) for writing the Latin
diagnosis, and anonymous manuscript reviewers for their helpful suggestions. This work was supported by
the Guangxi Natural Science Foundation (2011GXNSFB018050), Science Research Foundation of Guangxi
Institute of Botany (Guizhiye11001) and Science and Technology Innovation Program of Guangxi Academy
of Sciences and West Light Foundation of The Chinese Academy of Sciences.
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Guangxi, China. Nordic Journal of Botany 28(3): 313–315.
... Thus, Metabriggsia is reduced to synonymy with Hemiboea and its two species are transferred to that genus (Weber et al., 2011). So, now it has been revised 29 species and six varieties in China, northern Vietnam, Iriomote-Shima of Ryukyu, Japan (Li, 1996(Li, , 2004Wen et al., 2011;Xu et al., 2012;Pan et al., 2012). China, the center of species diversity of the genus, has all species distributed from South China eastward to Taiwan and northward to Henan andGanshu (Li, 1983, 1987), with 4 species recorded in Guangdong province before 2012 (Wei et al., 2010). ...
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... These indicated that Metabriggsia taxa were morphologically most similar to Hemiboea instead of being related to Briggsia W. G. Craib (1920) or Didymocarpus N. Wallich (1819) as had been suggested by Wang (1983), and no morphological characters supported the separation of Metabriggsia from Hemiboea, which was also corroborated by the molecular phylogeny, which showed Metabriggsia taxa nested within Hemiboea ). In addition, eight new species and one new variety were described in recent years (Li and Liu 2004, Wei 2010, Xu et al. 2010, Huang et al. 2011, Wen et al. 2011, Pan et al. 2012, Zhou et al. 2013, Zhang et al. 2014. A total of 33 species and six varieties have been documented in the genus up to date, with all except H. roseoalba S. B. Zhou, X. ...
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Hemiboea subcapitata C. B. Clarke is a widespread and morphologically varied species including three varieties, H. subcapitata var. subcapitata C. B. Clarke, H. subcapitata C.B. Clarke var. guangdongensis (Z. Y. Li) Z. Y. Li and H. subcapitata C. B. Clarke var. pterocaulis Z. Y. Li. However, previous description and our recent extensive observations indicated that H. subcapitata var. pterocaulis can be readily distinguished from the rest of H. subcapitata (i.e. H. subcapitata var. subcapitata and H. subcapitata var. guangdongensis) by some distinct morphological characters and the nonoverlapping phenological periods. Further, the present phylogenetic analyses using the nuclear ITS and plastid trnL-F DNA sequences also revealed that the sampled individuals identified as H. subcapitata var. pterocaulis grouped together and were clearly separated from other H. subcapitata. Based on these observations, we elevate the variety to the status of species, Hemiboea pterocaulis (Z. Y. Li) J. Huang, X. G. Xiang & Q. Zhang, comb. & stat. nov.
... The flowering plants were collected and researched by authors in Nov. 2010. When comparing it with those known species (Li, 1983(Li, , 1987Wang et al., 1990;Wei and Wen, 1995;Weitzman et al., 1997;Wang et al., 1998;Li and Liu, 2004;Li and Wang, 2004;Xu et al., 2010;Huang et al., 2011;Wen et al., 2011), it is confirmed that this specimen represents a undescribed species in Hemiboea. Herbs perennial. ...
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A new species of Gesneriaceae, Hemiboea pseudomagnibracteata B. Pan & W. H. Wu from limestone areas in Guangxi, China, is described and illustrated. The new species is close to Hemiboea magnibracteata Y. G. Wei & H. Q. Wen, but differs in its leaf blade oblong-elliptic to obovate, apex acuminate; calyx 5-parted to the base, lobes equal, linear-lanceolate, 8-12 × 2-2.5 mm; corolla white, outside glabrous, with densely brown spots, inside white with densely brown spots.
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Before 2010, Hemiboea Clarke (1798: 18) included about 23 species and 5 varieties mostly in central, southern and southwestern China, northern Vietnam and southern Japan (Ryukyu Islands), with the highest species diversity in southern and southwestern China (Weber 2004, Li & Wang 2004). Over the last two decades, 11 new taxa have been found and described in southern and southwestern China: eight new species and one new variety from Guangxi province (Li 2004, Li & Liu 2004, Xu et al. 2010, 2012, Wen et al. 2011, 2013, Pan et al. 2012, Zhou et al. 2013), two new species from Yunnan (Zhang et al. 2014, Chen et al. 2018), and one from Guizhou (Li et al. 2018). Meanwhile, the genus Metabriggsia Wang (1983: 1) including two species was revised and merged within Hemiboea (Weber et al. 2011). Additionally, H. subcapitata var. pterocaulis Li (2004: 261) was assigned from a variety to a distinct species, namely H. pterocaulis (Z.Y.Li) J.Huang, X.G.Xiang & Q.Zhang in Huang et al. (2017: 8) based on extensive morphological, phenological and molecular studies.
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Hemiboea sinovietnamica W. B. Xu & X. Y. Zhuang, a new species of Gesneriaceae from a limestone area along the boundary of Sino-Vietnam, is described and illustrated. The new species is similar to H. longgangensis Z. Y. Li with its yellowish corolla, but differs in having leaf blades glabrous on both sides, involucre trigonous, 2–3 cm in diameter, glabrous outside, glabrous cymes, a white calyx that is glabrous outside, and glabrous pistil and capsule.
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Conserving biodiversity requires identifying and addressing the myriad of problems generated when humans exploit natural resources. This chapter first explores ways in which priorities for both conservation action and research emerge and are evaluated. Effective conservation depends on identifying priorities for specific research and/or action. The first route is more reactive and involves the detection, through surveillance monitoring, of a change in status of a taxon, species group, habitat or ecosystem. The second route is more proactive and works by identifying potential threats that may cause significant negative changes in the future. Recognizing that conservation is ultimately a societal process underpinned by values and beliefs, the chapter describes how decisions about resource allocation for conservation actions can be informed by explicit use of scientific evidence in decision-making frameworks. The chapter ends by outlining future challenges to the development of decision-making frameworks for conservation that encompass policy, management and research
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Based on molecular data and morphology, Metabriggsia is reduced to synonymy with Hemiboea and its two species transferred to that genus.
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Hemiboea purpurea Yan Liu & W. B. Xu, a new species of Gesneriaceae from Guangxi, China, is described and illustrated. The new species is similar to H. follicularis C. B. Clarke, but differs by smaller leaf blades, 3–10×2–5 cm, corolla purple, ca 2.0–2.5 cm long, exserted from the involucre, filaments glandular-puberulent and staminodes 3. It is only known from one site in the Rongshui County.
Hooker's Icones Plantarum; or figures, with brief descriptive characters and remarks of new or rare plants 18: sub t
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Clarke, C.B. (1888) Hooker's Icones Plantarum; or figures, with brief descriptive characters and remarks of new or rare plants 18: sub t. 1798.
Icones Plantarum Formosanarum nec non et Contributiones ad Floram Formosanam 3. Government of Formosa, Taihoku
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Hayata, B. (1913) Icones Plantarum Formosanarum nec non et Contributiones ad Floram Formosanam 3. Government of Formosa, Taihoku, pp. 154-155.
Taxa Nova Hemiboeae (Gesneriaceae)
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Li, Z.Y. (1983) Taxa Nova Hemiboeae (Gesneriaceae). Acta Phytotaxonomica Sinica 21(2): 194-203.
A study of the genus Hemiboea (Gesneriaceae)
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Li, Z.Y. (1987) A study of the genus Hemiboea (Gesneriaceae). Acta Phytotaxonomica Sinica 25(2): 81-92.
The geographical distribution on the subfamily Cyrtandroideae Endl. emend. Burtt (Gesneriaceae)
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Li, Z.Y. (1996) The geographical distribution on the subfamily Cyrtandroideae Endl. emend. Burtt (Gesneriaceae). Acta Phytotaxonomica Sinica 34(4): 341-360.