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Descriptions

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

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

Agrostis isopholis

HABIT Perennial. Culms geniculately ascending; 30–45 cm long; 3–4 -noded; with 0.3–0.4 of their length below uppermost node. Culm-nodes glabrous. Lateral branches lacking, or sparse. Leaf-sheaths smooth. Ligule an eciliate membrane; 2–3 mm long; obtuse. Leaf-blades flat, or involute; 5–10 cm long; 1–1.5 mm wide. Leaf-blade surface smooth, or scaberulous; rough adaxially. Leaf-blade margins scaberulous. Leaf-blade apex attenuate; filiform.

INFLORESCENCE Inflorescence a panicle.

Panicle open; oblong; 7–17 cm long. Primary panicle branches 3–5 cm long. Panicle branches capillary; flexuous; smooth.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels 2–4 mm long.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets elliptic, or oblong; laterally compressed; 2.5–3 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus pilose.

GLUMES Glumes persistent; similar; exceeding apex of florets; firmer than fertile lemma; shiny; gaping. Lower glume lanceolate; 2.5–3 mm long; 1 length of upper glume; membranous; glandular (minutely on veins); 1-keeled; 3 -veined. Lower glume primary vein scaberulous. Lower glume apex acute. Upper glume lanceolate; 2.5–3 mm long; 1 length of adjacent fertile lemma; membranous; glandular (minutely on veins); 1-keeled; 3 -veined. Upper glume primary vein scaberulous. Upper glume apex acute.

FLORETS Fertile lemma oblong, or ovate; 2.5–3 mm long; cartilaginous; without keel; 5 -veined. Lemma lateral veins excurrent. Lemma surface asperulous; pilose; hairy below. Lemma apex truncate; muticous, or awned; 1 -awned. Principal lemma awn dorsal; arising 0.5–0.6 way up back of lemma; straight; 1–2.5 mm long overall. Palea 1.5 mm long; 0.5–0.6 length of lemma; hyaline; 2 -veined. Rhachilla extension 0.3–0.5 mm long; pubescent.

FLOWER Lodicules 2; membranous. Anthers 3; 1 mm long.

FRUIT Caryopsis with adherent pericarp. Hilum linear.

DISTRIBUTION Africa: west-central tropical.

NOTES Aveneae. FTA.

Please cite this publication as detailed in How to Cite Version: 3rd February 2016.