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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 hideoi

HABIT Perennial; caespitose. Rhizomes short. Culms erect; 20–40 cm long; 0.5–0.8 mm diam.; 4–5 -noded. Leaf-sheaths smooth. Ligule an eciliate membrane; 0.8–1 mm long; truncate, or obtuse. Leaf-blades 3–10 cm long; 1–2 mm wide. Leaf-blade surface scabrous; rough adaxially.

INFLORESCENCE Inflorescence a panicle.

Panicle open; ovate; effuse; 5–8 cm long; 2–3 cm wide; with spikelets clustered towards branch tips. Primary panicle branches 4–7 -nate; 1–3 cm long. Panicle branches scabrous.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels filiform; 3–8 mm long.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets elliptic; laterally compressed; 3–3.5 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus pubescent. Floret callus hairs 0.2 length of lemma.

GLUMES Glumes persistent; similar; exceeding apex of florets; firmer than fertile lemma. Lower glume lanceolate; 3–3.5 mm long; 1.1–1.2 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; 2.7–3 mm long; 1.7–1.8 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 oblong; 1.5–1.7 mm long; hyaline; without keel; 5 -veined. Lemma lateral veins excurrent. Lemma surface scaberulous; rough above. Lemma apex dentate; 4 -fid; awned; 5 -awned. Principal lemma awn dorsal; arising 0.1 way up back of lemma; geniculate; 3–3.5 mm long overall; with twisted column. Lateral lemma awns arising on apex of lobes; 0.8–1 mm long; shorter than principal. Palea 0.2 length of lemma; hyaline; 2 -veined.

FLOWER Lodicules 2; membranous. Anthers 3; 0.8–1 mm long.

FRUIT Caryopsis with adherent pericarp; oblong; 1.25 mm long. Hilum linear. Endosperm farinose.

DISTRIBUTION Asia-temperate: eastern Asia.

NOTES Aveneae. Koyama.

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