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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.
Deyeuxia frigida
HABIT Perennial; caespitose; clumped loosely. Culms erect; 90–150 cm long; 5–6 -noded. Culm-internodes antrorsely scabrous. Culm-nodes glabrous. Leaf-sheaths scaberulous. Ligule an eciliate membrane; 1–3 mm long; scaberulous on abaxial surface; erose, or lacerate; obtuse. Leaf-blades 10–20 cm long; 3–6 mm wide. Leaf-blade surface ribbed; scabrous; rough abaxially. Leaf-blade margins scabrous. Leaf-blade apex acute.
INFLORESCENCE Inflorescence a panicle.
Panicle open; 25 cm long. Primary panicle branches 2–4 -nate; sparsely divided. Panicle axis with lower internodes 4–6 cm long. Panicle branches with occasional prickles.
Spikelets solitary. Fertile spikelets pedicelled. Pedicels 1–6 mm long; scaberulous.
FERTILE SPIKELETS Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; laterally compressed; 4.5–5.5 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus pubescent. Floret callus hairs 0.1–0.2 mm long.
GLUMES Glumes persistent; similar; exceeding apex of florets; firmer than fertile lemma; gaping. Lower glume lanceolate; 3–3.5 mm long; 0.66 length of upper glume; membranous; much thinner on margins; mid-green, or purple; 1-keeled; 1 -veined. Lower glume primary vein scaberulous. Lower glume lateral veins absent. Lower glume surface asperulous. Lower glume apex acute. Upper glume lanceolate; 4.5–5.5 mm long; 1.1 length of adjacent fertile lemma; membranous; with scarious margins; mid-green, or purple; 1-keeled; 1 -veined. Upper glume primary vein scabrous. Upper glume lateral veins absent. Upper glume surface asperulous. Upper glume apex acute.
FLORETS Fertile lemma lanceolate; 4–5 mm long; membranous; light brown; without keel; 5 -veined. Lemma surface scaberulous. Lemma apex erose; truncate; awned; 1 -awned. Principal lemma awn dorsal; arising 0.5 way up back of lemma; geniculate; 4–5 mm long overall; with twisted column; deciduous. Palea 1 length of lemma. Palea keels scaberulous; adorned above. Rhachilla extension 0.6–1 mm long; pilose; with 0.3–1 mm long hairs.
FLOWER Lodicules 2. Anthers 3; 2 mm long. Stigmas 2.
FRUIT Caryopsis with adherent pericarp. Hilum punctiform. Disseminule comprising a floret.
DISTRIBUTION Australasia: Australia.
NOTES Aveneae. Vickery 1994.
Please cite this publication as detailed in How to Cite Version: 3rd February 2016.
