Cochinchinochloa (Gramineae: Bambusoideae-Bambusineae), a new bamboo genus endemic to Braian mountain, southern Vietnam

H.N Nguyen,V.T Tran,T.T Hoang

doi:10.3767/000651913x669068

Abstract

A clambering bamboo endemic to Braian mountain, southern Vietnam represents a new monotypic endemic genus, Cochinchinochloa H.N.Nguyen & V.T.Tran (Gramineae: Bambusoideae-Bambusinae), which is described and illustrated. Its culm nodes and the nodes of leafy branches exhibit a thick swollen patella, and in the reproductive state this taxon bears pseudospikelets having two perfect florets, with an elongated rachilla internode between the perfect florets, a rachilla extension bearing an imperfect floret at maturity, a narrowly 2-keeled palea with a distinct abaxial groove, three lodicules, six stamens, free filaments, a glabrous ovary with a long style and three stigmas, and an oblong caryopsis with a relatively thin pericarp.

Highlights

Asian clambering or scrambling genera in the tribe Bambu seae Kunth ex Nees, which are characterized by each node giving rise to several branches, with one becoming longer and dominant, and with a basic caryopsis have been clearly demarcated into groups
Investigating essentially these aspects for taxa (Maclurochloa, Soejatmia, Neololeba, Mullerochloa) previously classified in Bambusa, Wong (1993, 2005) and Widjaja (1997) found many additional characters distinguishing one or more of these genera from the type alliance of Bambusa s.s. (Table 1) Maclurochloa differs from Bambusa in having only one or two perfect flowers in the spikelet, which has 3 – 5 transitional glumes, of which the upper ones are as large as the lemma, and an ovary summit is not thickened; the primary-branch bud prophyll has free margins in Maclurochloa, but in Bambusa has fused margins
Living plants of this species were found in Braian mountain, Di Linh District, Lam Dong Province, southern Vietnam in January 2011

Summary

Introduction

Asian clambering or scrambling genera in the tribe Bambu seae Kunth ex Nees, which are characterized by each node giving rise to several branches, with one becoming longer and dominant, and with a basic caryopsis have been clearly demarcated into groups. The pseudospikelet of Mullerochloa is characterized by having 4–9 flowers, the rachilla internodes are not truly elongate, and there are 4 stamens with fused filaments (Wong 2005).

Results

Conclusion