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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 subulata

HABIT Perennial; caespitose; clumped densely. Basal innovations intravaginal. Culms 3–9 cm long. Leaf-sheaths scaberulous. Ligule an eciliate membrane; 0.8–1 mm long; scaberulous on abaxial surface; erose. Leaf-blades involute; 1.5–4 cm long; 0.3–0.6 mm wide. Leaf-blade surface scaberulous; rough on both sides. Leaf-blade apex abruptly acute.

INFLORESCENCE Inflorescence a panicle; aerial, or shorter than basal leaves. Peduncle antrorsely scabrous above.

Panicle spiciform; oblong; 1–2 cm long. Primary panicle branches appressed. Panicle branches scaberulous.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels scaberulous.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets lanceolate; laterally compressed; 2–3.3 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus glabrous.

GLUMES Glumes persistent; similar; exceeding apex of florets; firmer than fertile lemma; gaping. Lower glume lanceolate; 2–3.3 mm long; 1 length of upper glume; membranous; light green; 1-keeled; 1 -veined. Lower glume primary vein scabrous. Lower glume lateral veins absent. Lower glume surface scabrous. Lower glume apex acute. Upper glume lanceolate; 2–3.3 mm long; membranous; light green; 1-keeled; 1 -veined. Upper glume primary vein scabrous. Upper glume lateral veins absent. Upper glume surface scabrous. Upper glume apex acute.

FLORETS Fertile lemma ovate; 1.3–1.6 mm long; hyaline; without keel; 5 -veined. Lemma lateral veins extending close to apex. Lemma margins scabrous. Lemma apex erose; truncate; muticous, or awned; 1 -awned. Principal lemma awn dorsal; arising 0.66 way up back of lemma; straight; 1–2 mm long overall. Palea 0.3–0.4 mm long; 0.25 length of lemma; hyaline.

FLOWER Lodicules 2; 0.4 mm long; membranous. Anthers 3; 0.5–0.7 mm long.

FRUIT Caryopsis with adherent pericarp. Hilum linear.

DISTRIBUTION Australasia: New Zealand.

NOTES Aveneae. Edgar 1994.

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