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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 javana

HABIT Perennial; caespitose. Culms erect, or geniculately ascending; 10–80 cm long. Culm-internodes distally glabrous. Leaf-sheaths glabrous on surface. Ligule an eciliate membrane; 2–4 mm long; lacerate. Leaf-blades flat, or involute; 4–30 cm long; 1–8 mm wide; light green, or glaucous. Leaf-blade surface glabrous.

INFLORESCENCE Inflorescence a panicle.

Panicle open; oblong; equilateral, or nodding; 2.5–26 cm long. Primary panicle branches whorled at lower nodes. Panicle axis smooth, or scaberulous; pilose.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels 1.5–6 mm long.

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, or bearded. Floret callus hairs 1.5–2.5 mm long; 0.33–0.5 length of lemma.

GLUMES Glumes persistent; similar; reaching apex of florets; firmer than fertile lemma. Lower glume lanceolate; 3.5–4 mm long; 0.9 length of upper glume; coriaceous; mid-green, or purple; 1-keeled; 1 -veined. Lower glume primary vein ciliolate. Lower glume lateral veins absent. Lower glume surface asperulous. Lower glume apex acuminate. Upper glume lanceolate; 4.5–5.5 mm long; 1.1 length of adjacent fertile lemma; coriaceous; mid-green, or purple; 1-keeled; 1 -veined. Upper glume lateral veins absent. Upper glume apex acuminate.

FLORETS Fertile lemma lanceolate; 4–5 mm long; membranous; without keel; 5 -veined. Lemma surface scabrous. Lemma apex dentate; 2 -fid, or 4 -fid; awned; 1 -awned. Principal lemma awn dorsal; arising 0.33–0.5 way up back of lemma; straight; 5–8 mm long overall. Palea 1 length of lemma. Rhachilla extension 0.3–1 mm long; pilose.

FLOWER Lodicules 2. Anthers 3; 1.25–1.5 mm long; anther tip penicillate. Stigmas 2.

FRUIT Caryopsis with adherent pericarp. Hilum punctiform.

DISTRIBUTION Asia-tropical: Malesia and Papuasia. South America: western South America.

NOTES Aveneae. Fl Java 1997.

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