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The grass genera of the world

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

Lepargochloa Launert

~ Loxodera (L. rhytachnoides)

Habit, vegetative morphology. Perennial; decumbent. Culms about 20–90 cm high; herbaceous; unbranched above. Culm nodes hairy. Leaves not basally aggregated; non-auriculate. Leaf blades narrowly linear; narrow; to 6 mm wide; flat, or rolled (involute); without cross venation. Ligule an unfringed membrane; 2 mm long.

Reproductive organization. Plants bisexual, all with bisexual spikelets; with hermaphrodite florets. The spikelets all alike in sexuality; homomorphic.

Inflorescence. Inflorescence a terminal, spiciform ‘raceme’; espatheate (seemingly); not comprising ‘partial inflorescences’ and foliar organs. Spikelet-bearing axes ‘racemes’ and spikelike; solitary; with substantial rachides; persistent (seemingly). ‘Articles’ non-linear (subclavate); not appendaged (but the tips bristly-hairy); transversely jointed; densely long-hairy. Spikelets paired; sessile and pedicellate; consistently in ‘long-and-short’ combinations; in pedicellate/sessile combinations. Pedicels of the ‘pedicellate’ spikelets free of the rachis. The ‘shorter’ spikelets hermaphrodite. The ‘longer’ spikelets hermaphrodite.

Female-fertile spikelets. Spikelets 7–9 mm long; compressed dorsiventrally; falling with the glumes (presumably?). Rachilla terminated by a female-fertile floret. Hairy callus present. Callus short.

Glumes two; more or less equal; long relative to the adjacent lemmas; hairy (G1 with setaceous hairs, G2 ciliate); with distinct hair tufts (the setaceous hairs of the G1 in tufts); awnless; very dissimilar (G1 leathery, rugose, convex to flattened on the back, G2 thinner and boat-shaped). Lower glume not two-keeled; convex on the back to flattened on the back; not pitted; rugose to tuberculate; 7 nerved. Upper glume 3 nerved. Spikelets with incomplete florets. The incomplete florets proximal to the female-fertile florets. Spikelets with proximal incomplete florets. The proximal incomplete florets 1; paleate; male. The proximal lemmas awnless; 2(–3) nerved; decidedly exceeding the female-fertile lemmas; similar in texture to the female-fertile lemmas (thinly membranous); not becoming indurated.

Female-fertile florets 1. Lemmas ovate-elliptic; less firm than the glumes (thinly membranous); not becoming indurated; entire; pointed, or blunt; awnless; hairless (with ciliate margins); non-carinate; without a germination flap; 3 nerved. Palea present; relatively long; entire (acute or sub-acute); awnless, without apical setae; not indurated; 2-nerved; 2-keeled. Lodicules present; 2; free; fleshy; glabrous. Stamens 3. Anthers not penicillate; without an apically prolonged connective. Ovary apically glabrous. Stigmas 2.

Classification. Watson & Dallwitz (1994): Panicoideae; Andropogonodae; Andropogoneae; Rottboelliinae. Soreng et al. (2015): Panicoideae; Andropogonodae; Andropogoneae; Rottboelliinae (?). 1 species.

Distribution, phytogeography, ecology. Tropical southern Africa.

References, etc. Morphological/taxonomic: Launert 1961.

Special comments. Fruit data wanting. Anatomical data wanting.


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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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