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A New Species of Bulbophyllum (Orchidaceae) from Yunnan, China

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Bulbophyllum dulongjiangense X. H. Jin, a new species from Yunnan, China, is described and illustrated. The new species is related to B. gyrochilum Seidenfaden but differs from it by having larger flowers, longer lateral sepals to 2.3 cm with the dorsal sepal to 1.4 cm, falcate column stelids to 1.5 mm, and lip with two dorsal ridges.
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A New Species of Bulbophyllum (Orchidaceae) from Yunnan, China
Jin Xiao-Hua
Herbarium, Institute of Botany, Chinese Academy of Sciences, Nanxinchun 20, Beijing 100093,
People’s Republic of China. xiaohuajin@ibcas.ac.cn, and Key Laboratory for Plant Biodiversity
and Biogeography, KIB/CAS, Kunming 650204, People’s Republic of China.
xiaohuajin@mail.kib.ac.cn
ABSTRACT . Bulbophyllum dulongjiangense X. H. Jin,
a new species from Yunnan, China, is described and
illustrated. The new species is related to B.
gyrochilum Seidenfaden but differs from it by having
larger flowers, longer lateral sepals to 2.3 cm with the
dorsal sepal to 1.4 cm, falcate column stelids to
1.5 mm, and lip with two dorsal ridges.
Key words: Bulbophyllum, China, Orchidaceae,
sect. Desmosanthes, Yunnan.
Bulbophyllum Thouars is an orchid genus com-
prising about 1000 species widely extending from
tropical America, Africa, Madagascar, and mainland
Asia to Australasia. There are about 100 species
in China and about 65 in Yunnan (Tsi, 1999; Li,
2003). During fieldwork along the Dulong River in
northwest Yunnan, a new species of Bulbophyllum
was found.
Bulbophyllum dulongjiangense X. H. Jin, sp. nov.
TYPE: China. Yunnan: Gongshan Co., Dulong-
jiang, Dandanlika Mts., 4 Nov. 2004, X. H. Jin
6479 (holotype, KUN; isotype, PE). Figure 1.
Haec species habitu Bulbophyllo gyrochilo Seidenfaden
subsimilis, sed floribus majoribus, sepalis longioribus,
sepalo dorsali multo breviore quam sepalis lateralibus,
stelidiis longioribus et falcatis, labio cristis extensis ab
basi ad apicem differt.
Epiphytic on tree; rhizome pendent and free-
hanging with roots at its base; roots terete, arising
from nodes of pseudobulbs and rhizomes, running
along rhizome; pseudobulbs cylindrical, spaced
closely along the rhizome, adpressed, pointing toward
the apex of the rhizome at an acute angle to the
rhizome, 1.5–2 cm, 0.5–0.8 cm diam. Leaf 1 of each
pseudobulb, lanceolate 3.5
6 0.9–1 cm, acute,
slightly oblique. Inflorescences arising from pseudo-
bulb base, sub-umbelliform, 0.8 cm, shorter than
pseudobulbs, 10- to 15-flowered, with 2 to 3
membranous infertile bracts, 5 mm; fertile bracts
lanceolate, 0.7–0.8 mm. Ovary with pedicel 0.5–
0.6 cm; flowers pale yellow, patent; dorsal sepal
linear, caudate, 1.2–1.4
6 0.1 cm; lateral sepals
linear, oblique at base, caudate, 2.1–2.3
6 0.2 cm;
petals oblong, acuminate, 1-veined, 1.9–2.1
6 1.3–
1.5 mm; lip yellow, oblong, fleshy, pubescent at
margin, 2 dorsal ridges ranging from base to tip, 2–
2.2
6 0.9–1 mm; column stout, winged, 1–1.1 mm;
column stelids falcate, 1.5 mm; column foot 1 mm;
pollinia 2; anther cap entire, dorsal ridged. Fruits
not seen.
Distribution and phenology. This new species is
epiphytic on branches and tree trunks on the
eastern slope of the Dandanlika Mountains. Up
to now, only one population of about 150
clusters has been found. Flowering October to
November.
Bulbophyllum dulongjiangense is closely related
to B. gyrochilum from Doi Sutep and Chong Tha,
Thailand. Both have pendent, free-hanging rhizomes,
roots extending along the rhizomes, and short-scaped
sub-umbellate inflorescences. However, they can be
readily distinguished by their flower size, length of
sepals, and callus on lip. Bulbophyllum dulongjian-
gense has larger flowers, dorsal sepal to 1.4 cm,
lateral sepals to 2.3 cm, and lip with two dorsal
ridges, whereas B. gyrochilum has smaller flowers,
sepals of equal length or the lateral sepals slightly
longer (about 4–5 mm), and the lip is only somewhat
papillose.
Seidenfaden (1979) stated that it was difficult to
arrange a natural sectional system for Bulbophy-
llum gyrochilum;thisisalsotrueofitsallied
species, B. dulongjiangense. The new species has
a pendent, free-hanging rhizome and roots extend-
ing along the rhizome from the nodes of the
pseudobulb and the rhizome. This habit is similar
to that of plants in Bulbophyllum sect. Polyble-
pharon Schlechter. At the same time, its sub-
umbellate inflorescences and caudate sepals are
reminiscent of those of the plants in Bulbophyllum
sect. Cirrhopetalum (Lindley) P. Royen. Despite
this, we assign the new species to Bulbophyllum
sect. Desmosanthes (Blume) J. J. Smith based on its
sub-umbellate and many-flowered inflorescences
and free lateral sepals.
NOVON 16: 497–499. PUBLISHED ON 19 DECEMBER 2006.
Acknowledgments. This research was funded by
the Ministry of Science and Technology of China
(2005DKA21006). We thank Eduardo Borba and
an anonymous reviewer for their critical comments
on the manuscript. We are grateful to Victoria C.
Hollowell for editorial advice and Ling Wang for
the excellent illustration. We are indebted to the
officials of Chinese Forest Bureau and Yunnan
Forest Bureau for their kind help during the
fieldwork.
Figure 1. Bulbophyllum dulongjiangense X. H. Jin. —A. Habit. —B. Lateral view of flower. —C. Petal. —D. Decurved lip.
—E. Lateral view of column and lip. Drawn from the holotype Jin 6479, KUN.
498 Novon
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Volume 16, Number 4 Jin 499
2006 Bulbophyllum from Yunnan, China
ResearchGate has not been able to resolve any citations for this publication.
Bulbophyllum. 666-714
  • H Li
Li, H. 2003. Bulbophyllum. 666-714. in Li, H., editor. editors. Flora Yunnanica, Vol. 14. Science Press. Beijing.
Orchid genera in Thailand Bulbophyllum Thou
  • G Seidenfaden
Seidenfaden, G. 1979. Orchid genera in Thailand Bulbophyllum Thou. Dansk Bot. Ark. 33(3): 80-82.
  • Z H Tsi
Tsi, Z. H. 1999. Bulbophyllum. Pp. 164-257 in Z. H. Tsi (editor), Flora Reipublicae Popularis Sinicae, Vol. 19. Science Press, Beijing.
  • H Li
Li, H. 2003. Bulbophyllum. Pp. 666-714 in H. Li (editor), Flora Yunnanica, Vol. 14. Science Press, Beijing.