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Descriptions

W.D. Clayton, M. Vorontsova, K.T. Harman & H. Williamson

© Copyright The Board of Trustees, Royal Botanic Gardens, Kew.

Deyeuxia rosea

HABIT Perennial. Culms 20–35 cm long; 2–4 -noded. Culm-internodes terete; smooth; distally glabrous. Lateral branches lacking. Leaf-sheaths striately veined; smooth; glabrous on surface. Ligule an eciliate membrane; 5–9 mm long. Leaf-blades ascending; 4–8 cm long; 4 mm wide; glaucous. Leaf-blade surface ribbed; grooved adaxially; scaberulous; rough on both sides. Leaf-blade margins scaberulous. Leaf-blade apex attenuate.

INFLORESCENCE Inflorescence a panicle.

Panicle contracted; linear; continuous, or interrupted; 6–9 cm long; 1.7 cm wide. Panicle axis scaberulous. Panicle branches smooth, or scaberulous.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels smooth, or 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 pilose. Floret callus hairs 0.33–0.5 length of lemma.

GLUMES Glumes persistent; similar; reaching apex of florets, or exceeding apex of florets; firmer than fertile lemma. Lower glume elliptic; 4.5–5.5 mm long; 1.1 length of upper glume; membranous; purple; 1-keeled; 1 -veined. Lower glume primary vein scaberulous. Lower glume lateral veins absent. Lower glume apex acuminate. Upper glume elliptic; 4–5 mm long; 1 length of adjacent fertile lemma; membranous; purple; 1-keeled; 1 -veined. Upper glume primary vein scaberulous. Upper glume lateral veins absent. Upper glume apex acuminate.

FLORETS Fertile lemma elliptic; 4.5 mm long; 1.6–1.8 mm wide; membranous; without keel; 5 -veined. Lemma surface scabrous. Lemma apex truncate; awned; 1 -awned. Principal lemma awn dorsal; arising 0.5 way up back of lemma; straight; 4–5 mm long overall. Palea 3 mm long; 2 -veined. Rhachilla extension 2 mm long; pilose; with 2 mm long hairs.

FLOWER Lodicules 2. Anthers 3; 2–2.5 mm long. Stigmas 2.

FRUIT Caryopsis with adherent pericarp. Hilum punctiform.

DISTRIBUTION Asia-temperate: China.

NOTES Aveneae. Bor 1996.

Please cite this publication as detailed in How to Cite Version: 3rd February 2016.