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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 imbecilla

HABIT Perennial; caespitose; clumped loosely. Basal innovations extravaginal. Culms erect, or geniculately ascending; 15–35 cm long. Ligule an eciliate membrane; 0.8–1.6 mm long; glabrous on abaxial surface; entire, or erose; obtuse. Leaf-blades filiform; involute; 2–13 cm long; 0.2–0.4 mm wide; flaccid. Leaf-blade surface ribbed; scabrous; rough adaxially. Leaf-blade apex abruptly acute.

INFLORESCENCE Inflorescence a panicle. Peduncle smooth.

Panicle spiciform; linear; 5–9 cm long; 0.2–0.3 cm wide. Primary panicle branches appressed. Panicle axis scaberulous. Panicle branches scaberulous.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels scaberulous.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets lanceolate; laterally compressed; 1.5–2.4 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus glabrous.

GLUMES Glumes persistent; similar; reaching apex of florets, or exceeding apex of florets; firmer than fertile lemma; gaping. Lower glume lanceolate; 1.5–2.4 mm long; 1 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume primary vein scabrous. Lower glume lateral veins absent. Lower glume apex acute. Upper glume lanceolate; 1.5–2.4 mm long; membranous; 1-keeled; 1 -veined. Upper glume primary vein scabrous. Upper glume lateral veins absent. Upper glume apex acute.

FLORETS Fertile lemma ovate; 1.5–1.9 mm long; hyaline; without keel; 5 -veined. Lemma lateral veins obscure; extending close to apex. Lemma apex erose; truncate; muticous, or awned; 1 -awned. Principal lemma awn subapical; straight; 0–1 mm long overall; not or scarcely exserted from spikelet. Palea 0.1–0.2 mm long; 0.05–0.1 length of lemma; hyaline.

FLOWER Lodicules 2; 0.2–0.4 mm long; membranous. Anthers 3; 0.6–1 mm long.

FRUIT Caryopsis with adherent pericarp; 1–1.4 mm long. Hilum linear.

DISTRIBUTION Australasia: New Zealand.

NOTES Aveneae. Edgar 1994.

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