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The grass genera of the world

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

Ellisochloa P.M. Peterson & N.P. Barker

~ Danthonia, Merxmuellera

Type species: E. rangei (Pilg.) P.M. Peterson & N.P. Barker.

Habit, vegetative morphology. Perennial; caespitose. Culms 12–50 cm high. Leaf blades filiform or linear; narrow; 3.5–30 cm long, 1–3 mm wide; not pseudopetiolate. Ligule a fringe of hairs.

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

Inflorescence. Inflorescence paniculate; contracted; lanceolate to oblong; non-digitate; spatheate (or embraced by the flag leaf), or espatheate; not comprising ‘partial inflorescences’ and foliar organs. Spikelets solitary; not secund; pedicellate.

Female-fertile spikelets. Spikelets 9–18 mm long; cuneate; compressed laterally; disarticulating above the glumes; disarticulating between the florets; with conventional internode spacings. Rachilla prolonged beyond the uppermost female-fertile floret; the rachilla extension with incomplete florets, or naked. Hairy callus present (pubescent or pilose).

Glumes two; more or less equal; exceeding the spikelets; long relative to the adjacent lemmas (1.3–1.7 times the length of the lowest lemma); pointed (acute to acuminate); awnless; non-carinate; membranous, lanceolate, similar. Lower glume 1 nerved, or 3 nerved. Upper glume 1 nerved, or 3 nerved. Spikelets with incomplete florets. The incomplete florets distal to the female-fertile florets. The distal incomplete florets merely underdeveloped. Spikelets without proximal incomplete florets.

Female-fertile florets 2–3. Lemmas oblong; chartaceous, decidedly firmer than the glumes; not becoming indurated; incised; 2 lobed; deeply cleft (to about half the lemma length); awned. Awns 1; median; from a sinus; 9–18 mm long, geniculate. Awn bases twisted. Lemmas hairy. The hairs in tufts; in transverse rows (with a transverse row of tufts). Lemmas non-carinate; presumably without a germination flap; 9 nerved. Palea present; relatively long (more or less equalling the lemma). Palea back glabrous, or hairy. Lodicules present; 2; truncate, fleshy; glabrous. Stamens 3.

Fruit, embryo and seedling. Disseminule a free caryopsis. Pericarp fused.

Abaxial leaf blade epidermis. Microhairs absent. Subsidiaries triangular.

Transverse section of leaf blade, physiology. Lamina mid-zone in transverse section almost terete (circular in section). The adaxial channel reduced to a small groove.

C3; XyMS+. Mesophyll with non-radiate chlorenchyma. Midrib not readily distinguishable.

Classification. Watson & Dallwitz (1994): not described separately. Soreng et al. (2015): Chloridoideae; Centropodieae. 2 species (E. papposa, E. rangei).

Distribution, phytogeography, ecology. Namibia and South Africa.

Species of coarse alluvial sands.

References, etc. Morphological/taxonomic: Grassbase (2016).

Special comments. 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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