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Feddes Repertorium. 20 21;00 :1– 8. wileyonlinelibrary.com/journal/fedr
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© 2021 Wiley-VCH Gmb H
1 | INTRODUCTION
The genus Henckelia Spreng. (Gesneriaceae), in the
sense of Weber et al. (2011), presently includes about
73 species, distributed from China and N India to S
India and Sri Lanka and from W India to Vietnam. In
India, it is represented by 37 species, of which 21 spe-
cies occur in western, eastern Himalaya and northeast
India, and 16 species in the Western Ghats.
During the authors’ work on the floristic diversity of
the Eastern Himalayan state Arunachal Pradesh, India,
specimens of two Henckelia species were collected
in the Lower Subansiri and Kurung Kumey districts
(Figure 1), that proved new on closer inspection. They
are formally described here as new species.
2 | MATERIAL AND METHODS
Specimens of the two new species of Henckelia were
collected during plant collection trips to Arunachal
Pradesh from 2017 to 2019. Type specimens were de-
posited at ARUN and ASSAM. For comparison, mate-
rial was studied from ARUN, ASSAM, BM, CAL, E, G,
K, L, MH, P and PE. The number of mature individuals
found in the type locality was recorded for both species
for assessment of the conservation status.
3 | TAXONOMIC TREATMENT
1. Henckelia dasii Taram, D.Borah, R.Kr.Singh & Tag,
sp. nov. (Figure 2)
Type: India, Arunachal Pradesh, Lower Subansiri
district, Ziro Valley, 27° 29' 04.7" N 93° 49' 47.5" E, 1950
m, 22 August 2018, M. Taram 31878 (holotype ASSAM;
isotypes ARUN).
Diagnosis: The species is different from all other
species of Henckelia by its urceolate calyx, with the
lobes fused up to more than 3/4 of its length and small
calyx lobes. It is superficially similar to H. umbellata
Kanthraj & K.N.Nair (Figure 3) in having large, broadly
ovate bracts enclosing the flower buds and pedicels, but
can be easily distinguished by the eglandular leaves,
shorter peduncles, shorter pedicels, smaller urceolate
calyx, fused up to more than 3/4 of its length, corolla
smaller, white with light pinkish tinge, glabrous, eglan-
dular, stamens glabrous, eglandular, shorter, stamino-
des shorter, glabrous, ovary smaller, style eglandular,
disc annular, shorter. For details see Table 1.
RESEARCH PAPER
Two new species of Henckelia (Gesneriaceae) from the
Eastern Himalayan state Arunachal Pradesh, India
MomangTaram1 | DipankarBorah2 | Rajeev KumarSingh3 | HuiTag1
Revised: 3 June 2021
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Accepted: 27 July 2021
DOI: 10.1002/fedr.202100006
1Departm ent of Botany, Rajiv Gandhi
University, Rono Hills, Doimukh,
Arunach al Pradesh 791 112, India
2Department of Botany, Goalpara College,
Goalpara, Assam 783 101, India
3Botanical Survey of India, Southern
Regiona l Centre, TNAU Campus, Lawley
Road, Coimbatore, Tamil Nadu 6 41 003,
India
Correspondence
Rajeev Kumar Singh, Botanical Sur vey of
India, So uthern Regional Centre, TNAU
Campus, L awley Road, Co imbatore 641
003, Tamil Nadu, India.
Email: rksbsiadsingh@gmail.com
Funding information
Board of Research in Nuclear Sci ences;
Department of Atomi c Energy,
Government of India
Abstract
Two new species of Henckelia from the Eastern Himalayan state Arunachal
Pradesh, India, are described and illustrated. The first, Henckelia dasii Taram,
D.Borah, R.Kr.Singh & Tag is allied to H. umbellata Kanthraj & K.N.Nair, the
second, H. lallanii Taram, D.Borah, Tag & R.Kr.Singh is close to H. urticifolia
(Buch.- Ham. ex D.Don) A.Dietr. (type species of the former Chirita sect. Chirita).
The differences are given in Table 1 and 2, respectively. A key is presented for
the 21 Henckelia species presently known from N and NE India.
KEYWORDS
Kurung Kumey district, Lower Subansiri district, new species, northeast India
