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Descriptions

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

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

Lachnagrostis aemula

HABIT Annual; caespitose. Culms erect; 25–60 cm long; 2–4 -noded. Culm-internodes smooth, or scaberulous. Culm-nodes glabrous. Leaf-sheaths scaberulous. Ligule an eciliate membrane; scaberulous on abaxial surface; lacerate; obtuse. Leaf-blades 8–20 cm long; 2–7 mm wide. Leaf-blade surface scaberulous; rough adaxially. Leaf-blade apex acute, or acuminate.

INFLORESCENCE Inflorescence a panicle; embraced at base by subtending leaf. Peduncle antrorsely scabrous above.

Panicle open; pyramidal. Primary panicle branches ascending, or spreading; whorled at most nodes; branching divaricately. Panicle branches scabrous.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels clavate; 2–8 mm long; scabrous.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; laterally compressed; 3.5–6 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus pubescent. Floret callus hairs 0.2–0.6 mm long; 0.05–0.1 length of lemma.

GLUMES Glumes persistent; similar; exceeding apex of florets; firmer than fertile lemma; gaping. Lower glume lanceolate; 3.5–6 mm long; 1.1 length of upper glume; membranous; purple; 1-keeled; 1 -veined. Lower glume primary vein scabrous. Lower glume lateral veins absent. Lower glume apex acuminate. Upper glume lanceolate; 3–5 mm long; membranous; purple; 1-keeled; 1 -veined. Upper glume primary vein scabrous. Upper glume lateral veins absent. Upper glume surface scabrous. Upper glume apex acuminate.

FLORETS Fertile lemma lanceolate; 1.8–3.5 mm long; hyaline; without keel; 5 -veined. Lemma lateral veins extending close to apex. Lemma surface pilose. Lemma apex dentate; 4 -fid; with outer lobes longer; truncate; awned; 1 -awned. Principal lemma awn dorsal; arising 0.5 way up back of lemma; geniculate; 5–6 mm long overall; with twisted column. Palea 0.9 length of lemma; hyaline. Rhachilla extension 0.5 mm long; pilose.

FLOWER Lodicules 2; membranous. Anthers 3; 0.6–1.2 mm long.

FRUIT Caryopsis with adherent pericarp. Hilum linear.

DISTRIBUTION Australasia: Australia.

NOTES Aveneae. Vickery 1994.

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