| # The grass genera of the world |

L. Watson, T.D. Macfarlane, and M.J. Dallwitz

### Maclurochloa K.M. Wong

~ Bambusa

Type species: M. montana (Ridley) K.M. Wong.

Habit, vegetative morphology. Perennial; sympodially rhizomatous. The flowering culms leafy. Culms woody and persistent; cylindrical; branched above. Buds from which the primary culm branches arise 1. Primary branches clumped. The branching fastigiate, or suffrutescent, or dendroid (?). Culm leaf sheaths present. Leaves not basally aggregated. Leaf blades lanceolate; broad; flat; pseudopetiolate.

Reproductive organization. Plants bisexual, all with bisexual spikelets; with hermaphrodite florets. The spikelets hermaphrodite.

Inflorescence. Inflorescence indeterminate; with pseudospikelets (each subtended by a bract smaller than the lemmas); a complex of ‘partial inflorescences’ and intervening foliar organs. Spikelets not secund; sessile to subsessile.

Female-fertile spikelets. Spikelets unconventional; elliptic; probably compressed laterally; disarticulating above the glumes; disarticulating between the florets. Rachilla prolonged beyond the uppermost female-fertile floret; the rachilla extension with incomplete florets.

Glumes empty, transitional several (3–5); shorter than the spikelets (but the upper as long as the lemmas); shorter than the adjacent lemmas (i.e., falling short in the intact pseudospikelet); hairless; pointed; awnless; similar. Spikelets with incomplete florets. The incomplete florets distal to the female-fertile florets. The distal incomplete florets 1; merely underdeveloped; awnless.

Female-fertile florets 1, or 2. Lemmas entire; pointed; awnless, or mucronate; hairless. Palea present. Lodicules present; 3; free; membranous; ciliate; not toothed; heavily vascularized. Stamens 6; with free filaments. Anthers not penicillate; without an apically prolonged connective. Ovary apically hairy (?); with a conspicuous apical appendage. The appendage broadly conical, fleshy. Styles free to their bases. Stigmas 3.

Fruit, embryo and seedling. Fruit small to medium sized (about 4 mm); fusiform, or ellipsoid. Pericarp fused.

Transverse section of leaf blade, physiology. Mesophyll without ‘circular cells’.

Classification. Watson & Dallwitz (1994): genus not recognised. Soreng et al. (2015): Bambusoideae; Bambuseae; Bambusinae. 1 species (M. montana).

Distribution, phytogeography, ecology. Peninsular Malaya.

Paleotropical.

References, etc. Morphological/taxonomic: Clayton et al. (2016), Grassbase; K. M. Wong (1993): Four New Genera of Bamboos (Gramineae: Bambusoideae) from Malesia. Kew Bulletin 48, 517–532.

Special comments. Anatomical data wanting.

Illustrations. • Maclurochloa montana, as Bambusa: Holttum, Gardens Bull. Singapore (1958).

We advise against extracting comparative information from the descriptions. This is much more easily achieved using the DELTA data files or the interactive key, which allows access to the character list, illustrations, full and partial descriptions, diagnostic descriptions, differences and similarities between taxa, lists of taxa exhibiting or lacking specified attributes, distributions of character states within any set of taxa, geographical distribution, and classifications. See also Guidelines for using data taken from Web publications.

Cite this publication as: ‘Watson, L., Macfarlane, T.D., and Dallwitz, M.J. 1992 onwards. The grass genera of the world: descriptions, illustrations, identification, and information retrieval; including synonyms, morphology, anatomy, physiology, phytochemistry, cytology, classification, pathogens, world and local distribution, and references. Version: 15th June 2025. delta-intkey.com’.

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