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The grass genera of the world

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

Greslania Bal.

Habit, vegetative morphology. Shrubby perennial. Culms 100–300 cm high; woody and persistent; sparsely branched above, or unbranched above. Buds from which the primary culm branches arise 1. The branching simple. Culm leaf sheaths absent. Rhizomes pachymorph. Leaf blades pseudopetiolate. Contra-ligule absent.

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

Inflorescence. Inflorescence determinate; large, falsely paniculate (apical, of aggregated 1-spikelet racemes and their bracts and prophylls); non-digitate; spatheate; a complex of ‘partial inflorescences’ and intervening foliar organs. Spikelet-bearing axes very much reduced; persistent.

Female-fertile spikelets. Spikelets lanceolate, or ovate. Rachilla prolonged beyond the uppermost female-fertile floret; the rachilla extension with incomplete florets.

Glumes two; awnless; similar. Spikelets with incomplete florets. The incomplete florets distal to the female-fertile florets. The distal incomplete florets merely underdeveloped (rudimentary, pistillate). Spikelets without proximal incomplete florets.

Female-fertile florets 1. Lemmas not becoming indurated; entire; blunt; awnless; ‘lemma nerves obscure’. Palea present; not convolute; awnless, without apical setae; 2-keeled. Lodicules present; 3. Stamens 6. Ovary apically glabrous; with a conspicuous apical appendage. The appendage broadly conical, fleshy. Styles fused (short). Stigmas 3.

Fruit, embryo and seedling. Pericarp fleshy; free.

Abaxial leaf blade epidermis. Costal/intercostal zonation conspicuous. Papillae present; intercostal (in the stomatal bands only). Intercostal papillae over-arching the stomata; several per cell (various shapes, cuticularised). Mid-intercostal long-cells having markedly sinuous walls (these pitted, thick). Microhairs present; panicoid-type. Stomata common (obscured by papillae). Intercostal short-cells common; in cork/silica-cell pairs; silicified. Intercostal silica bodies tall-and-narrow. Costal short-cells conspicuously in long rows, or predominantly paired. Costal silica bodies saddle shaped.

Transverse section of leaf blade, physiology. C3; XyMS+. Mesophyll with non-radiate chlorenchyma; with arm cells; with fusoids (large). Leaf blade with distinct, prominent adaxial ribs; with the ribs more or less constant in size. Midrib conspicuous; having complex vascularization. Bulliforms present in discrete, regular adaxial groups; in simple fans (in the furrows). All the vascular bundles accompanied by sclerenchyma. Combined sclerenchyma girders present (with most bundles).

Special diagnostic feature. Not rush-like.

Classification. Watson & Dallwitz (1994): Bambusoideae; Bambusodae; Bambuseae. Soreng et al. (2015): Bambusoideae; Bambusodae; Bambuseae; Bambusinae. 4 species.

Distribution, phytogeography, ecology. New Caledonia.

References, etc. Leaf anatomical: Metcalfe 1960.

Special comments. Fruit data wanting. Illustrations. • G. rivularis and G. montana (Camus, 1913). • Abbreviations for Camus (1913) figures


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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: 13th November 2017. delta-intkey.com/grass’.

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