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GrassBase - The Online World Grass Flora
Descriptions
W.D. Clayton, M. Vorontsova, K.T. Harman & H. Williamson
© Copyright The Board of Trustees, Royal Botanic Gardens, Kew.
Lachnagrostis deflexa
HABIT Annual, or perennial; short-lived; caespitose. Culms erect, or geniculately ascending; 20–70 cm long; 1–1.5 mm diam. Leaf-sheaths loose, or inflated; longer than adjacent culm internode; smooth; glabrous on surface. Ligule an eciliate membrane; (5–)7–9 mm long; scaberulous on abaxial surface; lacerate; acute. Leaf-blades 3–12 cm long; 1.5–3 mm wide. Leaf-blade surface scaberulous.
INFLORESCENCE Inflorescence a panicle.
Panicle open; oblong; 10–20 cm long. Primary panicle branches spreading, or reflexed. Panicle branches stiff; scabrous.
Spikelets solitary. Fertile spikelets pedicelled. Pedicels 1–5 mm long.
FERTILE SPIKELETS Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets lanceolate, or elliptic; laterally compressed; (3–)3.3–4 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus pubescent. Floret callus hairs 0.5–0.6 mm long.
GLUMES Glumes persistent; similar; exceeding apex of florets; firmer than fertile lemma; gaping. Lower glume lanceolate; (3–)3.3–4 mm long; 1–1.1 length of upper glume; membranous; 1-keeled. Lower glume primary vein scabrous. Lower glume surface asperulous. Lower glume margins ciliate. Lower glume apex acuminate; awned; 1 -awned. Lower glume awn 1–1.7 mm long. Upper glume lanceolate; 2.9–3.7 mm long; 1.3–1.4 length of adjacent fertile lemma; membranous; 1-keeled. Upper glume primary vein scabrous. Upper glume surface asperulous. Upper glume margins ciliate. Upper glume apex acuminate; awned; 1 -awned. Upper glume awn 1–1.7 mm long.
FLORETS Fertile lemma oblong; 2.2–2.7(–3) mm long; hyaline; without keel; 5 -veined. Lemma lateral veins excurrent (0.3–0.7mm). Lemma surface glabrous. Lemma apex dentate; 4 -fid; awned; 1 -awned. Principal lemma awn dorsal; arising 0.5 way up back of lemma; geniculate; 4.5–6.5 mm long overall; with twisted column. Column of lemma awn 0.3–0.4 length of limb. Palea 1.9–2.2 mm long; 0.8–0.9 length of lemma; hyaline. Rhachilla extension 1.5–2 mm long; pilose.
FLOWER Anthers 3; 0.5–0.7(–0.8) mm long.
DISTRIBUTION Australasia: Australia.
NOTES Aveneae. Brown 2009.
Please cite this publication as detailed in How to Cite Version: 3rd February 2016.
