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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 pilosula

HABIT Annual; caespitose. Culms erect, or geniculately ascending; 30–75 cm long; without nodal roots, or rooting from lower nodes. Culm-nodes glabrous. Lateral branches lacking. Leaf-sheaths glabrous on surface. Ligule an eciliate membrane; 4–6 mm long. Leaf-blades 15–30 cm long; 2–3 mm wide. Leaf-blade surface scaberulous; rough on both sides; glabrous, or pubescent; sparsely hairy; hairy adaxially. Leaf-blade margins scaberulous. Leaf-blade apex acuminate.

INFLORESCENCE Inflorescence a panicle.

Panicle open, or contracted; lanceolate, or ovate; dense, or loose, or effuse; (5–)10–30 cm long. Primary panicle branches 2–5 -nate; whorled at most nodes. Panicle branches flexuous; smooth, or scaberulous.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels smooth; tip widened.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets elliptic; laterally compressed; 2.5–5.5 mm long; breaking up at maturity; disarticulating below each fertile floret.

GLUMES Glumes persistent; similar; exceeding apex of florets; firmer than fertile lemma; shiny; gaping. Lower glume lanceolate; 2.7–5.5 mm long; 1.1 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume primary vein scaberulous. Lower glume lateral veins absent. Lower glume apex acute. Upper glume lanceolate; 2–5 mm long; 1.3–1.4 length of adjacent fertile lemma; membranous; 1-keeled; 1 -veined. Upper glume primary vein scaberulous. Upper glume lateral veins absent. Upper glume apex acute.

FLORETS Fertile lemma elliptic; 1.5–3.5 mm long; hyaline; without keel; 5 -veined. Lemma lateral veins excurrent, or extending close to apex. Lemma surface pubescent. Lemma apex truncate; awned; 1 -awned. Principal lemma awn dorsal; arising 0.25–0.33 way up back of lemma; geniculate; 4–6 mm long overall; with twisted column. Palea 0.25–0.33 length of lemma; hyaline.

FLOWER Lodicules 2; membranous. Anthers 3; 0.75–1.5 mm long.

FRUIT Caryopsis with adherent pericarp. Hilum linear.

DISTRIBUTION Asia-temperate: China. Asia-tropical: India.

NOTES Aveneae. Bor 1993.

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