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LEPIDAGATHIS DALZELLIANA (ACANTHACEAE), A NEW SPECIES FROM THE NORTHERN WESTERN GHATS AND LECTOTYPIFICATION OF THE NAME LEPIDAGATHIS PROSTRATA DALZELL

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Lepidagathis dalzelliana sp. nov., (Acanthaceae: Barlerieae), is described from Maharashtra, India. The new species is closely allied to Lepidagathis clavata Dalzell. in appearance, but differs by long lanceolate, hairy bracts, and spatulate, oblanceolate to ovate-lanceolate glabrous leaves. Colored photographs and notes are provided to facilitate its distinction from closely allied species. In addition, we have designated the lectotype for the name Lepidagathis prostrata Dalzell.
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ISSN: 2320-5407 Int. J. Adv. Res. 11(06), 907-911
907
Journal Homepage: - www.journalijar.com
Article DOI: 10.21474/IJAR01/17143
DOI URL: http://dx.doi.org/10.21474/IJAR01/17143
RESEARCH ARTICLE
LEPIDAGATHIS DALZELLIANA (ACANTHACEAE), A NEW SPECIES FROM THE NORTHERN
WESTERN GHATS AND LECTOTYPIFICATION OF THE NAME LEPIDAGATHIS PROSTRATA
DALZELL
Sushant More1, Rohit Mane2, Mandar Sawant3 and Harshal Bhosale4
1. Institute of Science, Dr. Homi Bhabha State University, Mumbai, Maharashtra.
2. Department of Botany, Rayat Shikshan Sanstha, Balwant College, Vita, Sangli, Maharashtra, India.
3. Srushthi Conservation Foundation, Pune Maharashtra.
4. Environment Resources Management Mumbai, India Pvt Ltd, Mumbai, Maharashtra.
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Manuscript Info Abstract
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Manuscript History
Received: 25 April 2023
Final Accepted: 28 May 2023
Published: June 2023
Key words: -
Acanthaceae, India, Plateau, Barlerieae
Lepidagathis dalzelliana sp. nov., (Acanthaceae: Barlerieae), is
described from Maharashtra, India. The new species is closely allied to
Lepidagathis clavata Dalzell. in appearance, but differs by long
lanceolate, hairy bracts, and spatulate, oblanceolate to ovate-lanceolate
glabrous leaves. Colored photographs and notes are provided to
facilitate its distinction from closely allied species. In addition, we have
designated the lectotype for the name Lepidagathis prostrata Dalzell.
Copy Right, IJAR, 2023, All rights reserved.
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Introduction:-
Genus Lepidagathis Wild. Consists of 151 species distributed mainly in the tropics and sub-tropics (POWO, 2019).
In the last 16 years, there are ten novelties namely L. balkrishnannii Ramadevi & Binoj Kumar, L. benojiana Jithin
& Jose, L. shrirangii Natekar, Kambale & Chandore, L. ushae Borude. Gosavi & Chandore, L.
ananthapuremanensis V.S.A. Kumar, P. Biju, Sindhu Arya, Josekutty & Augustine, L. sabui Chandore, Borude,
Madhav & S.R. Yadav, L. rajasekharae K. Prasad & A.M. Reddy, and L. mahakassapae S. More, M. Sawant, H.S.
Bhosale & Kambale, L. decumbens N. Dhatchan. & S. Soosairaj, L. gandhii Gnanasek., A.F.J. King, S.M. Kasim &
Arisdason have been described in India (Ramadevi, S. and Binojkumar, S. S. 2008, Jithin & Jose 2017; Natekar et
al. 2019; Borude et al. 2020; Biju et al. 2020; Chandore et al. 2020; Prasad & Reddy 2020; More et al. 2022;
Balachandran. N. et al. 2022, Gnanasekaran et al. 2023). During 2020 - 2023, while studying the species of
Lepidgathis found on the plateaus of low-elevated coastal Konkan and high-elevated Northern Western Ghats,
several specimens of the genus Lepidagathis were collected and investigated through careful dissection under a
stereo zoom microscope likewise, high-resolution photographs of the specimens available on digital sources were
acquired from the curator of the respective herbaria K, BLAT, BM, BSI, CAL, MNHN, BSD (as per Thiers, 2023)
and detailed protologues of all Lepidgathis species found in India were studied.
After scrutiny, it was revealed that the specimens collected from Mhavashi, Chalkewadi, and Kaas plateau did not
match with any of the Lepidgathis described so far, and further that the name Lepidagathis prostrata Dalzell. has no
type designated yet. Hence in the present paper, we have designated a lectotype for the name L. prostrata Dalzell.
and described a new species to science.
Corresponding Author: - Sushant More
Address:- Institute of Science, Dr. Homi Bhabha State University, Mumbai, Maharashtra.
ISSN: 2320-5407 Int. J. Adv. Res. 11(06), 907-911
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Typification
Lepidagathis prostrata Dalzell. Hooker’s J. Bot. Kew Gard. Misc. 2: 138 (1850)
Lectotype (designated here): - INDIA, Maharashtra, Bombay [Bombay presidency]
Dalzell. s.n. K (K001392460, Image!) [Fig. 1]
Remarks
Dalzell described Lepidagathis prostrata (1850) based on his collections from Malvan, Bombay presidency [Now in
Maharashtra state]. We referred four specimens collected by Dalzell conserved at K (K001392457), (K001392458),
(K001392459), and (K001392460) out of these (K001392460!) is designated here as lectotype, being a complete
specimen and agrees well with the protologue according to article 9.3 of Schenzen code (Turland et.al 2018).
New species
Lepidagathis dalzelliana S. More, Mane, M. Sawant & H.S. Bhosale sp. nov. [Fig. 2]
Type. INDIA, Maharashtra, Satara District, Mhavashi, Dadhamwadi, WGS 84, 17°27'57.17"N, 73°54'20.44", alt.
1125 m a.s.l., 9, March 2021; S. More & R. Mane, RMSM 192 (Holotype, CAL; Isotype, BLAT).
Lepidagathis dalzelliana sp nov. is morphologically allied to L. clavata Dalzell. but can be distinguished by leaves
broadly oblanceolate to ovate-lanceolate, base attenuate (versus leaves oblong-lanceolate, base truncate), terminal,
axillary, 3-4 cm long, elongated or pyramidal shaped spikes (versus terminal, 7-8 cm long, oblong or clavate spikes),
floral 2.5 - 3cm. long, lanceolate, sterile ca. 3.5 - 3.9 cm long, ovate-lanceolate, hairy bracts (versus floral 1-1.5 cm.
long, ovate, hairy, sterile 1.8-2 cm long, lanceolate, plicate, glabrous bracts).
Description
Decumbent, sub-shrub 30 60 cm long, much branched; stems obtusely quadrangular, minutely hairy or glabrous,
nodes thick with adventitious roots, internodes 1.5 2.0 cm long. Leaves opposite, sessile, broadly oblanceolate to
ovate-lanceolate, 3 5.5 x 1.5 3.2 cm, apex acute, base attenuate, margin entire, subtly ciliate, glabrous. Spikes
axillary or terminal, elongated or pyramidal shaped, 3 4 cm long; Flowers few, sessile, bracteate, bracteolate.
Floral bracts lanceolate, 2.5 3 × 0.5 0.8 cm., densely hairy on both sides, 3 5 parallel nerves, margin entire,
apex spinous; Lower bracts ovate to ovate-lanceolate, sterile, ca. 3.5 3.9 x 0.8 1 cm long glandular-hairy, leaf-
like, apex spinous. Bracteoles two, 1.6 × 0.4 cm, linear-lanceolate, densely hairy, margin entire, apex spinous-
pointed. Calyx five-partite, sepals densely hairy, margin entire; the three outer segments unequal in length, apex
spinous-pointed, the upper 2 × 0.5 cm, ovate-lanceolate, 4 5 nerved; lower two connate at base, 1.6 × 0.4 cm,
ovate-lanceolate, 3 4 nerved; the inner two lateral segments 1.4 × 0.3 0.4 cm, ensiform. Corolla bilabiate, 1.5
1.8 cm long, tube 5 6 mm long, sparsely hairy above; dilated in the lower half, light pinkish to pale yellow. Upper
lips 5 mm long, notched, lobes rounded. The lower lips of three unequal lobes, 5 6 mm long. Middle lobe longer,
lateral two smaller, elliptic. Stamens 4, didynamous; filaments 4 - 8 mm long, white; anther lobes 2 mm long. Disc
annular, nectariferous. Ovary ovoid, glabrous, 2 mm long; Styles slender, curved, ca. 1.7 cm long, hairy in the lower
half; stigmas minute, shallowly lobed. Capsules turbinate, 10 × 4 mm., glabrous, acute at apex. Seeds two, Golden
yellow, 2.8 × 3 mm ovoid to orbicular, with amber-colored hygroscopic long hairs.
Etymology
The new species is named after Nicol Alexander Dalzell conservator of forests and superintendent of the Botanical
Gardens in the Bombay Presidency, to honour his work and contributions to the field of the botany of Western
Maharashtra.
Phenology
(Flowering and Fruiting): November to April
Distribution
Lepidagathis dalzelliana sp. nov is distributed on the plateaus of Satara district namely Mhavashi, Kaas, and
Chalkewadi Plateau, and is endemic to the state of Maharashtra.
Paratypes
India, Maharashtra, Satara district, Chalkewadi Plateau, WGS 84, 17°35'12.28"N,73°49'47.49"E, alt. 1136 m a.s.l.,
13 March 2021, S. More, SSM 193,194 (BSI); India, Maharashtra, Satara district, Satara taluka, Kaas plateau, WGS
84, 17°43'33.19"N,73°49'26.10"E, alt. 1253 m a.s.l., 27 October 2021, S. More, SSM 195 (BLAT).
ISSN: 2320-5407 Int. J. Adv. Res. 11(06), 907-911
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Habitat and ecology
Lepidagathis dalzelliana grows on high-altitude lateritic plateaus from 1000 to 1298 m a.s.l., in accumulated soil
and among small stone boulders in association with Ischaemum impressum Hack. Lepidagathis mahakassapae S.
More, M. Sawant, Kambale & H.S. Bhosale., Justicia trinervia vahl. and Blumea malcolmii Hook.f. It was also
observed that Crematogaster sp. ants were feeding and passing the nectar droplets to each other.
Notes
It is observed that the population of Lepidagathis dalzelliana sp. nov from Kaas and Chalkewadi is highly robust in
appearance whereas the Mhavashi population is delicate. At first glance, sterile bracts of new species can be
mistaken for leaves but the presence of a spine at the apex and glandular hairy nature differs it from the actual
glabrous leaves. Lepidagathis dalzelliana sp. nov. is likely to be confused with one form of highly variable species
L. cuspidata Nees. which grows as a prostrate plant on the open plateaus of northern Western Ghats around
Mahabaleshwar, and Panchgani tableland, unlike its typical form which grows as erect subshrub up to 100 to 150
cm. in height. But can be distinguished by unique longer lanceolate, hairy bracts and spatulate, broadly oblanceolate
to ovate-lanceolate glabrous leaves in the former whereas hairy cuspidate leaves and glandular-hairy, ovate bracts in
the latter.
Figure 1: - Lectotype of Lepidagathis prostrata Dalzell. (K, K001392460). © The Board of Trustees for the Royal
Botanic Gardens, Kew. (Reproduced with permission).
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Figure 2: - a - Habit of Lepidagathis dalzelliana sp. nov., b - Spike close up, c - Style and ovary, d - Capsule, e -
Seed, f - Flower, g - Vegetative twig showing leaves, h - Bracts abaxial and side view, i - Bracteoles, j - Sepals
(Photographs © Sushant More & Rohit Mane).
Acknowledgments: -
The authors are grateful to Mr. Shripad Halbe, and Brihad Bhartiya Samaj, Mumbai for funding the Fieldwork. SM
Thanks Authorities Directors of Royal Botanic Gardens, Kew, Dr. Homi Bhabha state university, Mumbai, Institute
of Science, Mumbai, and Blatter Herbarium, St. Xavier’s College, Mumbai, for the laboratory and library resources.
We also thank Dr. Rutuja Kolte, Belgaon for providing the flowering specimen of Lepidagathis clavata for study.
RM is thankful to the Head of, the Department of Botany and the Principal of Balwant College, Vita for providing
the necessary facilities.
Reference: -
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