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Descriptions

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

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

Astrebla pectinata

HABIT Perennial; caespitose. Cataphylls evident. Rhizomes short. Butt sheaths glabrous. Culms erect; 30–120 cm long; 6–9 -noded. Ligule a ciliolate membrane. Leaf-blades 7.5–25 cm long; 3–6 mm wide; glaucous. Leaf-blade surface ribbed. Leaf-blade margins scaberulous. Leaf-blade apex filiform.

INFLORESCENCE Inflorescence composed of racemes; embraced at base by subtending leaf.

Racemes 1; single; unilateral; 4–13 cm long; 10–20 mm wide. Rhachis flattened; puberulous on surface. Spikelet packing broadside to rhachis; crowded; regular; 2 -rowed.

Spikelets pectinate; solitary. Fertile spikelets pedicelled. Pedicels oblong.

FERTILE SPIKELETS Spikelets comprising 2–4 fertile florets; with diminished florets at the apex. Spikelets oblong; laterally compressed; 10–17 mm long; breaking up at maturity; disarticulating above glumes but not between florets. Rhachilla internodes 0.5 mm long. Floret callus pilose.

GLUMES Glumes persistent; dissimilar; shorter than spikelet; thinner than fertile lemma. Lower glume lanceolate, or ovate; 7–14 mm long; 0.9–1 length of upper glume; chartaceous; much thinner on margins; 1-keeled; 5–9 -veined. Lower glume apex acuminate. Upper glume lanceolate, or ovate; 8–13 mm long; 0.66–0.75 length of adjacent fertile lemma; chartaceous; with membranous margins; without keels; 7–16 -veined. Upper glume apex acuminate.

FLORETS Fertile lemma oblong; 12–17 mm long; coriaceous; much thinner above; without keel; 3 -veined (in the body). Lemma lateral veins augmented by subsidiaries in lobes. Lemma surface villous; hairy below. Lemma apex lobed; 3 -fid; with outer lobes longer; with lanceolate lobes; incised 0.5–0.7 of lemma length; awned; 1 -awned. Principal lemma awn 6 mm long overall. Palea 4–6 mm long. Palea keels ciliate. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Lodicules 2; cuneate; fleshy; truncate. Anthers 3.

FRUIT Caryopsis with adherent pericarp.

DISTRIBUTION Australasia: Australia.

NOTES Cynodonteae. Gardner.

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