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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 suka

HABIT Perennial. Rhizomes short. Butt sheaths persistent and investing base of culm; with fibrous dead sheaths. Culms 40–60 cm long; 2–3 -noded. Culm-nodes brown; glabrous. Leaf-sheaths smooth; glabrous on surface. Ligule an eciliate membrane; 4.5–5 mm long; erose; acute. Leaf-blades conduplicate, or involute; 5–20 cm long; 2–3 mm wide; stiff. Leaf-blade surface glabrous.

INFLORESCENCE Inflorescence a panicle.

Panicle open; elliptic; 7–11 cm long.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels smooth, or scaberulous.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; without rhachilla extension, or with a barren rhachilla extension. Spikelets lanceolate; laterally compressed; 5–6.5 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes elongated below proximal fertile floret. Rhachilla elongation 0.5 mm long. Floret callus bearded. Floret callus hairs 1 length of lemma.

GLUMES Glumes persistent; similar; exceeding apex of florets; firmer than fertile lemma. Lower glume lanceolate; 1 length of upper glume; membranous; purple; 1-keeled; 1 -veined. Lower glume lateral veins absent. Lower glume surface scabrous. Lower glume apex acute. Upper glume lanceolate; 1.7–1.8 length of adjacent fertile lemma; membranous; purple; 1-keeled; 3 -veined. Upper glume surface scabrous. Upper glume apex acute.

FLORETS Fertile lemma lanceolate; 3–3.5 mm long; membranous; without keel. Lemma surface scaberulous. Lemma apex erose; obtuse; awned; 1 -awned. Principal lemma awn dorsal; arising 0.33–0.66 way up back of lemma; straight, or geniculate; 3–4.5 mm long overall; without a column, or with a straight or slightly twisted column. Palea 2.6–2.8 mm long. Palea keels scabrous. Rhachilla extension 3–4.5 mm long; pilose.

FLOWER Lodicules 2; 0.9–1.3 mm long. Anthers 3; 0.9–1.5 mm long. Stigmas 2.

FRUIT Caryopsis with adherent pericarp; sulcate on hilar side; 2 mm long. Embryo 0.25 length of caryopsis. Hilum punctiform. Endosperm farinose. Disseminule comprising a floret.

DISTRIBUTION South America: southern South America.

NOTES Aveneae. Fl Pat 1995.

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