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The grass genera of the world

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

Lophopogon Hackel

Habit, vegetative morphology. Low, delicate annual, or perennial; caespitose. Culms herbaceous; branched above, or unbranched above.

Reproductive organization. Plants bisexual, all with bisexual spikelets; with hermaphrodite florets. The spikelets of sexually distinct forms on the same plant; hermaphrodite and male-only; overtly heteromorphic (the pedicellate spikelets awned, the sessile members of the lower pairs awnless); in both homogamous and heterogamous combinations (the upper pairs homogamous, the lower pairs with the sessile spikelets male).

Inflorescence. Inflorescence of spicate main branches; contracted; digitate. Primary inflorescence branches 2 (the two short ‘racemes’ closely appressed to form an ovate head). Inflorescence espatheate; not comprising ‘partial inflorescences’ and foliar organs. Spikelet-bearing axes ‘racemes’; paired; with very slender rachides; disarticulating; disarticulating at the joints. ‘Articles’ disarticulating obliquely; densely long-hairy (the hairs reddish). Spikelets paired; sessile and pedicellate (the pedicel tips oblique); consistently in ‘long-and-short’ combinations; in pedicellate/sessile combinations. Pedicels of the ‘pedicellate’ spikelets free of the rachis. The ‘shorter’ spikelets male-only (in the lower part of the inflorescence), or hermaphrodite (above). The ‘longer’ spikelets hermaphrodite.

Female-sterile spikelets. The lower sessile spikelets male-only, dorsally compressed, awnless. The male spikelets with glumes; 2 floreted. The lemmas awnless.

Female-fertile spikelets. Spikelets compressed laterally; falling with the glumes. Rachilla terminated by a female-fertile floret. Callus pointed.

Glumes two; very unequal; with distinct hair tufts (G1 truncate, with transversely placed tufts, at least in upper spikelets); awned (G2 only, the awn short); very dissimilar (G1 hair-tufted, truncate, 3-toothed and awnless, the G2 short-awned). Lower glume not two-keeled; convex on the back; not pitted; distinctly nerved. Spikelets with incomplete florets. The incomplete florets proximal to the female-fertile florets. The proximal incomplete florets 1.

Female-fertile florets 1. Lemmas linear; less firm than the glumes; incised; 2 lobed; deeply cleft; awned. Awns 1; median; from a sinus; geniculate. Lemmas non-carinate; without a germination flap. Lodicules absent. Stamens 2.

Classification. Watson & Dallwitz (1994): Panicoideae; Andropogonodae; Andropogoneae; Andropogoninae. Soreng et al. (2015): Panicoideae; Andropogonodae; Andropogoneae; Saccharinae. 2 species.

Distribution, phytogeography, ecology. India.

Species of open habitats.

Special comments. Fruit data wanting. Anatomical data wanting. Illustrations. • L. tridentatus: Rangachariyar K., Hndbk. S. Indian Grasses (1921)


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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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