GrassBase - The Online World Grass Flora

Descriptions

W.D. Clayton, M. Vorontsova, K.T. Harman & H. Williamson

© Copyright The Board of Trustees, Royal Botanic Gardens, Kew.

Polevansia

HABIT Perennial. Culms 8–40 cm long. Ligule a ciliolate membrane.

INFLORESCENCE Inflorescence composed of racemes.

Racemes borne along a central axis; in a multilateral false spike; unilateral. Rhachis flattened.

Spikelets solitary. Fertile spikelets sessile.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets elliptic; dorsally compressed; 4–4.5 mm long; breaking up at maturity; disarticulating below each fertile floret.

GLUMES Glumes persistent; reaching apex of florets; thinner than fertile lemma. Lower glume ovate; 0.5 length of upper glume; hyaline; without keels; 0 -veined. Lower glume lateral veins absent. Lower glume surface without pits. Lower glume apex obtuse. Upper glume lanceolate; 1 length of adjacent fertile lemma; membranous; without keels; 1 -veined. Upper glume apex acute.

FLORETS Fertile lemma elliptic; coriaceous; without keel; wingless; 3 -veined. Lemma lateral veins obscure. Lemma surface unwrinkled; without grooves. Lemma apex dentate; 2 -fid; mucronate. Palea 1 length of lemma; coriaceous; 2 -veined.

FRUIT Caryopsis with adherent pericarp; ellipsoid.

DISTRIBUTION Africa.

Please cite this publication as detailed in How to Cite Version: 27th January 2014.