Cephalostachyum chevalieri a new synonym of Kinabaluchloa wrayi Poaceae: Bambusoideae, and a new bamboo record for Vietnam Van Tien Tran , Nian-He Xia , Hoang Nghia Nguyen and My Hanh
Trang 1Cephalostachyum chevalieri a new synonym of Kinabaluchloa wrayi
(Poaceae: Bambusoideae), and a new bamboo record for Vietnam
Van Tien Tran , Nian-He Xia , Hoang Nghia Nguyen and My Hanh Diep
V T Tran and N.-H Xia (nhxia@scbg.ac.cn), Key Laboratory of Plant Resources and Sustainable Utilization/Guangdong Provincial Key Laboratory of Digital Botanical Garden, South China Botanical Garden, the Chinese Academy of Sciences, CN-510650 Guangzhou, China – H N Nguyen, Forest Science Inst of Vietnam, Dong Ngac, Tu Liem, Hanoi, Vietnam – M H Diep, Ho Chi Minh City Univ of Natural Science, 227 Nguyen Van Cu, Ho Chi Minh City, Vietnam
Cephalostachyum chevalieri A Camus is found to be a new synonym of Kinabaluchloa wrayi (Stapf ) K M Wong, extending
the species range from the Malay Peninsula to Vietnam Its type, Chevalier 4485, and other specimens collected from the type locality, have the same culm leaf, pseudo-spikelet and fl ower characteristics as K wrayi
Th e genus Kinabaluchloa K M Wong (Wong 1993) was
separated from Bambusa to accommodate two species,
K wrayi (Stapf ) K M Wong and K nebulosa K M Wong
in Malaysia Whereas K wrayi was only recorded from
Peninsular Malaysia, K nebulosa is known only in Borneo,
recorded from Sabah and Sarawak (Malaysian Borneo) and
Brunei Kinabaluchloa is distinguished from Schizostachyum
Nees, which it otherwise superfi cially resembles in its branch
complement of many subequal branches developing from a
single culm bud, by ovaries that are slightly hairy at the apex,
from which three stigmas arise directly, and the presence of
a vestigial terminal fl ower in the pseudo-spikelet Of the two
species, K wrayi is characterised by one perfect fl ower, whereas
K nebulosa has two perfect fl owers (Wong 1993, 1995)
Cephalostachyum chevalieri A Camus was proposed based
on the type specimen Chevalier 4485 – a fl owering branch
collected by Poilane in the Nha Trang Mountains (Camus
1943) Very few diagnostic characters were given in the
protologue of this species, only the presence of an apical
sterile fl oret, two stigmas in the fl ower, and an ovary with
a steeple-like appendage on a pubescent apex were
men-tioned, but no descriptions of the culm leaves were provided
With this information alone, it was not possible to directly
compare this species with Kinabaluchloa
Recently, it we got the possibility to examine the type
material of C chevalieri , isotype material of K wrayi (kept
at P) and compare these with our collections from the type
locality at Mount Hon Ba (Khanh Hoa Province) and
from Mount Bidoup (Lam Dong Province) near the type
locality Th e branch complement of many subequal branches
developing from a single culm bud was generally similar
in these collections (Fig 1A, D) Th e culm leaves of the
Vietnamese material were essentially similar in all aspects to that described for K wrayi (Wong 1993, 1995) and bear a
ring of spreading pale bristles at their base around the culm node (Fig 1B) and have narrowly linear blades (Fig 1C) and low rim-like auricles bearing stiff pale bristles Dissection of pseudo-spikelets from the Paris isotype confi rmed the pres-ence of one perfect fl ower and a terminal vestigial fl ower in the pseudo-spikelet (Fig 1F), 3 lodicules (Fig 1G) and 3 stigmas in the sole perfect fl ower (Fig 1H), as was found in
K wrayi
It is clear that C chevalieri does not belong in
Cephalostachyum Munro, which is a genus characterised by
very long-awned bracts and glumes at the base of pseudo-spikelets that are tightly aggregated into a terminal ball-like head, and two stigmas (Holttum 1958, Xia 1993, Wong
2004, Yang et al 2007) Instead, C chevalieri belongs in Kinabaluchloa and appear synonymous to K wrayi , as
described above
Kinabaluchloa wrayi (Stapf) K M Wong
(1993)
Basionym : Bambusa wrayi Stapf, Bull Misc Inform Kew
(1893, p 14)
Type : Malay Peninsula, Perak, Gunong Inas, Wray 4166
(holotype: K, isotypes: P, SING)
Taxonomic synonym: Cephalostachyum chevalieri A Camus
(1943, p 74) syn nov
Type : Annam, A Chevalier 4485 (holotype: P)
© 2014 Th e Authors Nordic Journal of Botany © 2014 Nordic Society Oikos
Subject Editor: Torbjörn Tyler Accepted 2 May 2012
Nordic Journal of Botany 32: 468–470, 2014
doi: 10.1111/j.1756-1051.2013.00979.x,
Trang 2Figure 1 (A) branch complement at a node from V T Tran 704, (B) node with culm leaf removed Note ring of spreading bristles from V
T Tran 703, (C) culm leaf with refl exed linear blade from V T Tran 703, (D) type specimen of Cephalostachyum chevalieri , Chevalier 4485
(P), (E) single pseudo-spikelet from (P), (F) fl ower with palea addorsed to a rachilla internode bearing a vestigial terminal fl ower, from (P), (G) lodicules from (P), (H) stigmas from (P)
Distribution
Malay Peninsula: Peninsular Malaysia Borneo: Sabah,
Sarawak and Brunei (Wong 1995) Vietnam: Hon Ba
Mountain (Khanh Hoa Province), Bidoup Mountain
(Lam Dong Province), Chu Yang Sin (Kon Tum
Province), in montane forest at elevations between 500
and 1600 m a.s.l
Additional specimens examined
Vietnam, Khanh Hoa Province, Hon Ba Mountain, 500 m a.s.l., 15 Jul 2009, V T Tran 703 (FSIV ⫽ Forest Science Inst of Vietnam), 15 Jul 2009, V T Tran 7031 (IBSC); Vietnam, Lam Dong Province, Bidoup Mountain, 1550 m a.s.l., 15 Dec 2009, V T Tran 704 (FSIV) 15 Dec 2009, V
T Tran 7041 (IBSC)
Trang 3Acknowledgements – Th is work was supported by the South China
Botanical Garden (SCBG), the SEP Bamboos Project and Forest
Science Institute of Vietnam (FSIV) We gratefully acknowledge
Dr K M Wong (Singapore Botanic Garden) for helpful comments
on early drafts of the manuscript We also thank the Board of
the Mus é um National d / Histoire Naturelle Paris, as well as Prof
Jean-Noel Labat, Dr Sovanmoly Hul, and Dr Th omas Haevermans
for their kind help in locating specimens
References
Camus, A 1943 Cephalostachyum chevalieri A Camus, bamboo
nouveau de L ’ Indochine – Bull Soc Bot Fr 94: 74 – 75
Holttum, R E 1958 Th e bamboos of the Malay Peninsula – Gard Bull Singap 16: 1 – 135
Wong, K M 1993 Four new genera of bamboos (Gramineae: Bambusoideae) from Malesia – Kew Bull 48: 517 – 532 Wong, K M 1995 Th e bamboos of Peninsular Malaysia – For
Res Inst Malaysia, pp 150 – 151
Wong, K M 2004 Bamboo, the amazing grass A guide to the diversity and study of bamboos in southeast Asia – Int Plant Genet Resour Inst., Univ of Malaya, Kuala Lumpur Xia, N H 1993 Studies on the genus Schizostachyum and other
bamboos from China – J Trop Subtrop Bot 1: 1 – 10 Yang, H Q et al 2007 Generic delimitations of Schizostachyum
and its allies (Gramineae: Bambusoideae) inferred from GBSSI and trnL-F sequence phylogenies – Taxon 56: 45 – 54