|
Note - this takes you off
of our website |
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 suizanensis
HABIT Perennial; caespitose; clumped densely. Rhizomes short. Culms erect; 30–50 cm long; 0.8–1.5 mm diam.; 1–2 -noded. Culm-internodes smooth. Leaves mostly basal. Leaf-sheaths 2–5 cm long; smooth; glabrous on surface. Ligule an eciliate membrane; 0.7–3 mm long. Leaf-blades filiform; involute; 15–30 cm long; 2–3 mm wide; stiff. Leaf-blade apex attenuate.
INFLORESCENCE Inflorescence a panicle. Peduncle smooth, or scaberulous above.
Panicle contracted; linear, or lanceolate; 6–20 cm long; 0.7–1.6 cm wide. Primary panicle branches appressed; 1–6 cm long; bearing spikelets almost to the base. Panicle branches scaberulous.
Spikelets solitary. Fertile spikelets pedicelled. Pedicels filiform.
FERTILE SPIKELETS Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; laterally compressed; 4.8–5.5 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus bearded. Floret callus hairs 0.33–0.5 length of lemma.
GLUMES Glumes persistent; similar; exceeding apex of florets; firmer than fertile lemma. Lower glume lanceolate; 4.8–5.5 mm long; 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 acuminate. Upper glume lanceolate; 4.8–6.5 mm long; 1.2–1.4 length of adjacent fertile lemma; membranous; with hyaline margins; 1-keeled. Upper glume primary vein scabrous. Upper glume surface asperulous. Upper glume apex acuminate.
FLORETS Fertile lemma lanceolate; 4–4.5 mm long; membranous; without keel; 5 -veined. Lemma lateral veins extending close to apex. Lemma surface asperulous. Lemma apex entire; acuminate; awned; 1 -awned. Principal lemma awn dorsal; arising 0.25–0.33 way up back of lemma; geniculate; 5–6 mm long overall; with twisted column. Rhachilla extension 1 mm long; pilose.
FLOWER Lodicules 2. Anthers 3; 1–1.2 mm long. Stigmas 2.
FRUIT Caryopsis with adherent pericarp. Hilum punctiform. Disseminule comprising a floret.
DISTRIBUTION Asia-temperate: eastern Asia. Asia-tropical: Malesia and Papuasia.
NOTES Aveneae. Koyama 1994.
Please cite this publication as detailed in How to Cite Version: 3rd February 2016.
