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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 rodwayi
HABIT Perennial. Culms erect, or geniculately ascending; slender; 15–40 cm long; 3 -noded. Culm-nodes glabrous. Leaf-sheaths antrorsely scabrous; glabrous on surface. Ligule an eciliate membrane; 2–3 mm long; scaberulous on abaxial surface; lacerate; truncate. Leaf-blades 4–10 cm long; 1–3 mm wide. Leaf-blade surface puberulous, or pubescent; hairy on both sides. Leaf-blade apex acute.
INFLORESCENCE Inflorescence a panicle.
Panicle contracted; linear; 4–11 cm long. Primary panicle branches appressed; 2–3 -nate; bearing spikelets almost to the base. Panicle axis with lower internodes 1–2.5 cm long. Panicle branches scaberulous.
Spikelets solitary. Fertile spikelets pedicelled. Pedicels 0.5–3 mm long; scabrous.
FERTILE SPIKELETS Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; laterally compressed; 3.5–4.2 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus pubescent. Floret callus hairs 0.2–0.8 mm long; 0.2 length of lemma.
GLUMES Glumes persistent; similar; reaching apex of florets; thinner than fertile lemma; gaping. Lower glume lanceolate; 1 length of upper glume; membranous; much thinner on margins; 1-keeled; 1 -veined. Lower glume primary vein scabrous. Lower glume lateral veins absent. Lower glume surface asperulous. Lower glume apex acute. Upper glume lanceolate; 3.5–4.2 mm long; 1 length of adjacent fertile lemma; membranous; with scarious margins; 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; 3.5–4.2 mm long; coriaceous; 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; 2 mm long overall; with twisted column. Palea 1 length of lemma. Palea keels scaberulous; adorned above. Rhachilla extension 1 mm long; glabrous.
FLOWER Lodicules 2. Anthers 3; 0.5 mm long. Stigmas 2.
FRUIT Caryopsis with adherent pericarp; oblong; 2 mm long. Hilum punctiform. Disseminule comprising a floret.
DISTRIBUTION Australasia: Australia.
NOTES Aveneae. Vickery 1995.
Please cite this publication as detailed in How to Cite Version: 3rd February 2016.
