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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 palustris
HABIT Perennial; caespitose. Butt sheaths purple. Culms erect, or geniculately ascending; 25–80 cm long; 1–2 mm diam. Culm-internodes distally glabrous. Lateral branches lacking, or sparse. Leaf-sheaths longer than adjacent culm internode; smooth. Ligule an eciliate membrane; (4–)6–8 mm long; lacerate; acute. Leaf-blades erect; filiform; involute; 5–15(–20) cm long; 0.2–1.5 mm wide. Leaf-blade surface smooth, or scaberulous.
INFLORESCENCE Inflorescence a panicle.
Panicle open; oblong; effuse; 10–35 cm long. Primary panicle branches spreading; 2–8 cm long. Panicle branches scabrous.
Spikelets solitary. Fertile spikelets pedicelled. Pedicels scabrous.
FERTILE SPIKELETS Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets lanceolate, or elliptic; laterally compressed; (3.2–)3.4–3.7(–4) mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus pubescent. Floret callus hairs 0.5–0.7 mm long.
GLUMES Glumes persistent; similar; exceeding apex of florets; firmer than fertile lemma; gaping. Lower glume lanceolate; (3.2–)3.4–3.7(–4) mm long; 1.1 length of upper glume; membranous; purple; 1-keeled. Lower glume primary vein scabrous. Lower glume surface smooth, or asperulous. Lower glume apex acuminate. Upper glume lanceolate; 3–3.5 mm long; 1.9–2 length of adjacent fertile lemma; membranous; purple; 1-keeled. Upper glume primary vein scabrous. Upper glume surface smooth, or papillose. Upper glume apex acuminate.
FLORETS Fertile lemma oblong; 1.5–1.8 mm long; hyaline; without keel; 5 -veined. Lemma lateral veins excurrent (0.5–0.7 mm), or extending close to apex. Lemma surface pilose. Lemma hairs 0.3–0.4 mm long. Lemma apex dentate; 4 -fid; with lobes 0.1–0.3 mm long; awned; 1 -awned. Principal lemma awn dorsal; arising 0.5 way up back of lemma; geniculate; (4.3–)5–6(–6.5) mm long overall; with twisted column. Column of lemma awn 0.5–0.66 length of limb. Palea 1.2–1.6 mm long; 0.8–0.9 length of lemma; hyaline. Rhachilla extension 1.2–1.6 mm long; pilose.
FLOWER Anthers 3; 0.4–0.5(–0.6) mm long.
DISTRIBUTION Australasia: Australia.
NOTES Aveneae. Brown 2009.
Please cite this publication as detailed in How to Cite Version: 3rd February 2016.
