Journal of
Threatened Taxa | www.threatenedtaxa.org | 26 August 2018 | 10(9): 12290–12293
Notes on Cinnamomum travancoricum Gamble
(Lauraceae) - a Critically Endangered species from
the southern Western Ghats, India
A.J. Robi 1,
P. Sujanapal 2 & P.S. Udayan
3
1 Department of Botany, Bishop Abraham
Memorial College, Thuruthicad, Pathanamthitta,
Kerala 689597, India
2 Kerala Forest Research Institute, Peechi, Thrissur, Kerala 676503,
India
3 P.G. Department of Botany & Research
Centre, Sree Krishna College, Ariyannur
P.O., Guruvayur, Thrissur,
Kerala 680102, India
1 ajrobin80@gmail.com (corresponding
author), 2 sujanapalp@gmail.com, 3 psudayan@rediffmail.com
doi: https://doi.org/10.11609/jott.4095.10.9.12290-12293
Editor: N.P. Balakrishnan, Coimbatore,
India. Date of publication: 26
August 2018 (online & print)
Manuscript details: Ms # 4095 |
Received 23 February 2018 | Final received 24 July 2018 | Finally accepted 19
August 2018
Citation: Robi, A.J., P. Sujanapal
& P.S. Udayan (2018). Notes on Cinnamomum
travancoricum Gamble (Lauraceae)
- a Critically Endangered species from the southern Western Ghats, India. Journal of Threatened
Taxa 10(9): 12290–12293; https://doi.org/10.11609/jott.4095.10.9.12290-12293
Copyright: © Robi. et
al. 2018. Creative Commons Attribution 4.0
International License. JoTT allows
unrestricted use of this article in any medium, reproduction and distribution
by providing adequate credit to the authors and the source of publication.
Funding: Department of Science and Technology, Govt. of India.
Competing interests: The authors declare no competing interests.
Acknowledgements: The authors are thankful to Dr.
M. Sanjappa, former Director, Botanical Survey of
India, Kolkatta, Dr. G.V.S.
Murthy, Botanical Survey of India, Coimbatore, Dr. N.
Sasidharan Kerala Forest Research Institute, Thrissur and Dr. A.K. Pradeep, University of Calicut, Calicut for their
help. The authors are also thankful to
the Department of Science & Technology, Govt. of India, New Delhi for the
financial support and The Director, Kerala Forest Research Institute, Peechi for facilities and support. The facilities provided
by the Kerala Forest Department during fieldwork are thankfully acknowledged. Also thankful to the unknown reviewers of the manuscript.
Cinnamomum Schaeff. belongs to the family Lauraceae,
with approximately 350 species distributed from Southeast Asia to Australia and
the New World (Rohwer 1993; van der Werff 2009). The
species was described by Gamble (1925) based on the specimen collected by T.F. Bourdillon from Chemunji Hills of
Agasthyamala Biosphere Reserve, Kerala, India in
1895. Owing to its affinity to C. sulphuratum Nees several
botanists incorrectly reported this species from different localities (Ramachandran & Nair 1988; Mohanan
& Sivadasan 2002; Geethakumary
et al. 2013). During recent
explorations in 2012 from the Kerala part of the Western Ghats, the present
authors collected one unknown Cinnamomum species
from Pandipath in Agasthyamala
Biosphere Reserve, Thiruvananthapuram district of Kerala. Scrutiny of the collected specimens and
comparison with the type sheets deposited at L (Nationaal
Herbarium Nederland, Leiden), CAL (Central National Herbarium, Howrah, India),
TBGT (Tropical Botanic Garden and Research Institute, Trivandrum, India) proved
that the collected material was C. travancoricum Gamble,
a Critically Endangered and endemic plant with a very narrow distribution in
Kerala. The misleading report of Geethakumary et al. (2013) from the Anamalai
Hill ranges, however, confused us and it led us to the reinvestigation of the
literature, type specimens and expert opinions to confirm the correct identity
of the species. There are only a few
small trees identified from the top edge of the hills. The present effort is a collection of the
species after type specimen.
Cinnamomum travancoricum
Gamble
in Kew Bull. 1925: 128. 1925 & Fl. Madras 2: 1224.
1925; Bor, Man. Ind. For.
Bot. 52. 1953; Kosterm., Bibl. Laur. 358. 1964; Chandras. in A.N. Henry et al. Fl.
Tamil Nadu 2: 208. 1987; M. Mohanan
& A.N. Henry, Fl. Thiruvanthapuram 392. 1994; Gopalan & A.N. Henry, Endemic
Pl. Agasthyamala 81. 2000; N. Mohanan & Sivad., Fl. Agasthyamala 568. 2002; Sasidh., Biodiv.
Doc. Kerala - Fl. Pl. 397. 2004 (Images 1 & 2).
Type: India, Kerala, Chemunji,
Travancore, ±1200m, 05.iv.1895, Bourdillon 545
(K000778624 (Royal Botanic Gardens, Kew) image! “inadvertently”
lectotypified by Kostermans
in 1983).
Specimens
examined: 545 (K000778623 image!), 5.iii.1895, India, Kerala, Travancore, Chemunji, 1,220m, coll. T.F. Bourdillon;
23319 (KFRI!), 24.ii.2012, Thiruvananthapuram District, Pandipath,
±1,600m, coll. A.J. Robi & P. Sujanapal.
Small
trees, up to 6m tall; bark greyish; branchlets
slender, angular, densely sub-appressed or appressed pilose; terminal buds
not perulate, small, sub-appressed
pilose. Leaves simple, opposite, estipulate, trinerved; petioles 6–10 mm long, slender, shallowly
grooved above, sub-appressed pilose;
lamina 3.5–8 × 2–3 cm, elliptic or subovate-elliptic,
base cuneate or acute, apex obtusely acuminate or
attenuate, thinly coriaceous, glabrous adaxially (young leaves appressed
pilose), smooth, glossy adaxially,
glaucous, densely appressed
sericeous abaxially; midrib
slightly raised or impressed adaxially, raised,
prominent and slender abaxially; lateral veins 2,
paired, opposite, thin, at 2–5 mm above the base and terminate near the tip of
lamina, faint and glabrous adaxially,
prominent, densely appressed sericeous
abaxially; major intercostal veins scalariform, prominent abaxially;
minor intercostal veins finely reticulate, prominent abaxially
and faint adaxially. Inflorescences pseudo-terminal
and axillary reduced cyme (or racemose), 1–4 cm long,
slender, few flowered, unbranched, densely brown sub-appressed pubescent, 3–5 flowers per peduncle. Flowers c. 6mm long, greenish, densely brown-sericeous; pedicels c. 3mm long, thick, greenish, densely appressed sericeous; tepals 6 in 2 whorls of 3 each, equal, ovate, c. 2 × 1 mm
long, obtuse at apex, thick, densely sub-appressed
light brown pilose, appressed
pilose inside (hairs long, coarse) caducous, greenish, margin ciliate; stamens 9 in 3 whorls
of 3 each, c. 1.5–2.5 mm long; outer whorl 3, anthers elliptic, 4-locular,
fleshy, introrse; filaments densely pilose, thin, eglandular; middle
whorl almost the same as the outer; inner whorl 3, latrorse;
anthers c. 2mm long, oblong, 4-locular, with obtuse tips; filaments with
2-glands attached near the basal portion; sessile, oblong, obtuse at apex, pilose; staminodes 3, c. 1.5mm
long, sagittate, stipitate,
densely pilose; ovary c. 1.5mm long, ellipsoid, glabrous; style c. 1mm long, glabrous,
stigma large and peltate. Fruits unknown.
Flowering:
February–April.
Distribution:
Endemic to the southern Western Ghats; Kerala (Thiruvananthapuram
District). It is very rare in the high
altitude wet evergreen forests, collected from Pandipath
of the Agasthyamala Biosphere Reserve (Image 3).
Ecology:
This species grows mainly along the wet evergreen forests at an altitude range
of 1200–1500 m and the associated species are mainly Beilschmiedia
jacobii Robi, Udayan & S. George, Elaeocarpus
venustus Bedd., Garcinia travancorica Bedd., and Litsea gorayana Udayan & Robi. Only five mature individuals were noted on
the hilltop. Natural regeneration of
this species is very poor due to the fragmented forest patches.
Notes:
In the protologue Gamble mentioned only one specimen,
T.F. Bourdillon 545 (K000778624 image!), but there
are well-preserved specimens at L, CAL, TBGT.
While revising the genus Cinnamomum in
southern India, Kostermans (1983) typified the name C.
travancoricum and it should be considered as
‘inadvertent’ lectotypification according to Art. 7.11 of ICNAFP (Turland et al. 2018). Geethakumary et al.
(2013) misidentified C. sulphuratum as C.
travancoricum and reported its occurrence in Munnar sholas, Idukki District of
Kerala. Later, Deepu
et al. (2017) lectotypified C. travancoricum,
but it was superfluous. In this paper we report its recollection from Pandipath of Agasthyamalai
region.
According
to Walter & Gillet (1997), the species was
recorded as Vulnerable; however, the number
of individuals identified from the locality was five. According to the IUCN Red List category and
criteria, the extent of occurrence of C. travancoricum
is estimated to be less than 50km2 in a single location with a decline in
quality of habitat (CR B1ab(iii)). The total number of mature individuals in the
known population is less than 5 (D).
Based on this evidence the conservation status of C. travancoricum is assessed as Critically Endangered (B1ab(iii)+D).
References
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