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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 richardii
HABIT Annual; caespitose. Basal innovations intravaginal. Culms 30–90 cm long. Leaf-sheaths smooth, or scaberulous. Ligule an eciliate membrane; 1.3–6 mm long; scaberulous on abaxial surface; erose; obtuse. Leaf-blades 6–28 cm long; 2–6.5 mm wide. Leaf-blade surface ribbed; scaberulous; rough on both sides. Leaf-blade margins scaberulous; glabrous.
INFLORESCENCE Inflorescence a panicle; deciduous as a whole. Peduncle fracturing.
Panicle open; elliptic, or ovate; 12–28 cm long; 6–20 cm wide. Panicle axis scabrous. Panicle branches capillary; scaberulous.
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; 3.5–5.5 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus bearded. Floret callus hairs 1.5 mm long; 0.5 length of lemma.
GLUMES Glumes persistent; similar; exceeding apex of florets; firmer than fertile lemma; gaping. Lower glume lanceolate, or elliptic; 1 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume primary vein scabrous. Lower glume lateral veins absent. Lower glume surface smooth, or asperulous; rough above. Lower glume apex acute, or acuminate. Upper glume linear, or lanceolate; 3.5–5.5 mm long; 1.5 length of adjacent fertile lemma; membranous; 1-keeled; 1 -veined. Upper glume primary vein scabrous. Upper glume lateral veins absent. Upper glume surface smooth, or asperulous; rough above. Upper glume apex acute, or acuminate.
FLORETS Fertile lemma elliptic, or oblong; 2–2.8 mm long; hyaline; without keel; 5 -veined. Lemma lateral veins excurrent. Lemma surface pilose; hairy below. Lemma apex truncate; awned. Principal lemma awn dorsal; arising 0.5 way up back of lemma; straight, or geniculate; 1–8.5 mm long overall; with a straight or slightly twisted column. Palea elliptic, or oblong; 0.5–1 length of lemma; hyaline; 2 -veined. Rhachilla extension 0.2–0.5 mm long; pilose; with 1 mm long hairs.
FLOWER Lodicules 2; lanceolate; 0.5 mm long; membranous; acute. Anthers 3; 0.6–1.2 mm long.
FRUIT Caryopsis with adherent pericarp; 1.3–1.8 mm long.
DISTRIBUTION Australasia: New Zealand.
NOTES Aveneae. Edgar 1997.
Please cite this publication as detailed in How to Cite Version: 3rd February 2016.
