GrassBase - The Online World Grass Flora


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

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

Agrostis leptostachys

HABIT Annual; caespitose. Basal innovations intravaginal. Culms erect; 15–35 cm long. Leaf-sheaths smooth, or scaberulous. Ligule an eciliate membrane; 2–4.5 mm long; glabrous on abaxial surface, or scaberulous on abaxial surface; erose; truncate. Leaf-blades flat, or involute; 3.5–10 cm long; 1–2 mm wide. Leaf-blade surface ribbed; grooved adaxially; scabrous; rough on both sides. Leaf-blade margins scaberulous. Leaf-blade apex acute.

INFLORESCENCE Inflorescence a panicle; deciduous as a whole. Peduncle antrorsely scabrous above; fracturing.

Panicle open; ovate; effuse; 7–16 cm long; 2–12 cm wide. Panicle axis scabrous. Panicle branches capillary; scabrous.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; without rhachilla extension, or with a barren rhachilla extension. Spikelets lanceolate; laterally compressed; 4.5–5.5 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus pilose. Floret callus hairs 1 mm long; 0.25–0.33 length of lemma.

GLUMES Glumes persistent; similar; exceeding apex of florets; firmer than fertile lemma; gaping. Lower glume lanceolate; 1 length of upper glume; membranous; much thinner on margins; light green; 1-keeled; 1 -veined. Lower glume primary vein scabrous. Lower glume lateral veins absent. Lower glume surface asperulous; rough above. Lower glume apex acute, or acuminate. Upper glume lanceolate; 4.5–5.5 mm long; 2 length of adjacent fertile lemma; membranous; with hyaline margins; light green; 1-keeled; 1 -veined. Upper glume primary vein scabrous. Upper glume lateral veins absent. Upper glume surface asperulous; rough above. Upper glume apex acute, or acuminate.

FLORETS Fertile lemma elliptic; 2.5–3 mm long; hyaline; without keel; 5 -veined. Lemma lateral veins excurrent. Lemma surface pubescent. Lemma apex truncate; awned. Principal lemma awn dorsal; arising 0.5–0.66 way up back of lemma; straight, or curved; 4–6 mm long overall. Palea elliptic; 0.5–0.66 length of lemma; hyaline; 2 -veined. Rhachilla extension 0.5 mm long; pilose; with 0.5–1 mm long hairs.

FLOWER Lodicules 2; lanceolate; 1 mm long; membranous; acute. Anthers 3; 0.8–1.2 mm long.

FRUIT Caryopsis with adherent pericarp; 1.5 mm long.

DISTRIBUTION Australasia: New Zealand.

NOTES Aveneae. Edgar 1997.

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