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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 tripilifera

HABIT Annual. Culms erect, or geniculately ascending; slender; 12–60 cm long; 2–3 -noded. Culm-nodes brown. Leaf-sheaths smooth; glabrous on surface. Ligule an eciliate membrane; 3–7 mm long; acute. Leaf-blades 4–16 cm long; 2–5 mm wide. Leaf-blade surface smooth, or scaberulous. Leaf-blade margins scaberulous. Leaf-blade apex acuminate.

INFLORESCENCE Inflorescence a panicle.

Panicle open; elliptic, or pyramidal; 5–16 cm long; 1–8 cm wide. Primary panicle branches spreading. Panicle branches capillary; scaberulous.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels scaberulous.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; laterally compressed; 4.5–5.5 mm long; 0.8–1 mm wide; breaking up at maturity; disarticulating below each fertile floret. Floret callus 0.33 mm long; pubescent. Floret callus hairs 1 mm long.

GLUMES Glumes persistent; similar; exceeding apex of florets; firmer than fertile lemma; shiny; gaping. Lower glume lanceolate; 4–5.5 mm long; 1 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume primary vein scaberulous. Lower glume lateral veins absent. Lower glume apex acuminate. Upper glume lanceolate; 4.2–5 mm long; 1.3–1.7 length of adjacent fertile lemma; membranous; 1-keeled; 1 -veined. Upper glume primary vein scaberulous. Upper glume lateral veins absent. Upper glume apex acuminate.

FLORETS Fertile lemma oblong; 3 mm long; hyaline; without keel; 5 -veined. Lemma lateral veins excurrent. Lemma apex dentate; 4 -fid; truncate; awned; 3 -awned. Principal lemma awn dorsal; arising 0.33 way up back of lemma; geniculate; 6–7.5 mm long overall; with twisted column. Palea 2.2–2.5 mm long; 0.75 length of lemma; hyaline; 2 -veined. Palea keels scaberulous; adorned above. Rhachilla extension 0.4 mm long; pilose.

FLOWER Lodicules 2; 0.7 mm long; membranous. Anthers 3; 0.5–0.7 mm long.

FRUIT Caryopsis with adherent pericarp; ellipsoid; 1.3 mm long. Hilum linear.

DISTRIBUTION Asia-tropical: India.

NOTES Aveneae. Rajbhandari 1994.

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