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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 filipes
HABIT Perennial; caespitose. Culms erect; 30–60 cm long; 1–1.2 mm diam. Lateral branches lacking. Leaf-sheaths glabrous on surface. Ligule an eciliate membrane; 2–3 mm long. Leaf-blades erect; flat, or involute; 6–18 cm long; 2–7 mm wide. Leaf-blade surface smooth, or scaberulous. Leaf-blade apex acuminate.
INFLORESCENCE Inflorescence a panicle. Peduncle smooth.
Panicle open; lanceolate, or pyramidal; 8–15 cm long; 3–5 cm wide. Panicle branches smooth, or scaberulous.
Spikelets solitary. Fertile spikelets pedicelled. Pedicels filiform; flexuous; smooth, or scaberulous.
FERTILE SPIKELETS Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; laterally compressed; 5–6 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus pilose. Floret callus hairs 0.25–0.33 length of lemma.
GLUMES Glumes persistent; similar; exceeding apex of florets; firmer than fertile lemma. Lower glume lanceolate; 5–6 mm long; 1 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume primary vein smooth, or scaberulous. Lower glume lateral veins absent. Lower glume apex acuminate. Upper glume lanceolate; 5–6 mm long; 1.2 length of adjacent fertile lemma; membranous; 1-keeled; (1–)3 -veined. Upper glume primary vein smooth, or scaberulous. Upper glume lateral veins absent, or obscure. Upper glume apex acuminate.
FLORETS Fertile lemma oblong; 4–5 mm long; membranous; without keel; 5 -veined. Lemma lateral veins excurrent, or extending close to apex. Lemma apex erose; awned; 1 -awned. Principal lemma awn dorsal; arising 0.1 way up back of lemma; geniculate; 6–9 mm long overall; with twisted column. Palea 3–5 mm long; 0.75–1 length of lemma; 2 -veined. Rhachilla extension 1–1.5 mm long; pilose; with 1.5–2 mm long hairs.
FLOWER Lodicules 2. Anthers 3; 2.5–3 mm long; purple. Stigmas 2.
FRUIT Caryopsis with adherent pericarp; fusiform; 2 mm long. Hilum punctiform.
DISTRIBUTION Asia-temperate: China.
NOTES Aveneae. Keng 1996.
Please cite this publication as detailed in How to Cite Version: 3rd February 2016.
