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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 squarrosa

HABIT Perennial; caespitose. Rhizomes short. Culms erect; 20–150 cm long. Ligule a fringe of hairs. Leaf-blades flat, or conduplicate; 15–30 cm long; 3–6 mm wide. Leaf-blade surface scabrous; rough adaxially. Leaf-blade margins scaberulous. Leaf-blade apex filiform.

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

Racemes 1; single; unilateral; 7–18 cm long. Rhachis flattened; scabrous on surface. Spikelet packing broadside to rhachis; regular; 2 -rowed.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels oblong; 1.5–2.5 mm long; scaberulous.

FERTILE SPIKELETS Spikelets comprising 2–4 fertile florets; with diminished florets at the apex. Spikelets ovate; laterally compressed; 8–11 mm long; breaking up at maturity; disarticulating above glumes but not between florets.

GLUMES Glumes persistent; dissimilar; shorter than spikelet; thinner than fertile lemma. Lower glume lanceolate; 5–10 mm long; 0.8–0.9 length of upper glume; chartaceous; 1-keeled; 1–5 -veined. Lower glume apex acuminate; mucronate. Upper glume elliptic; 6–11 mm long; 1 length of adjacent fertile lemma; chartaceous; without keels; 9–11 -veined. Upper glume apex acuminate; mucronate.

FLORETS Fertile lemma oblong; 9–12 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; incised 0.4–0.5 of lemma length; awned; 3 -awned. Principal lemma awn hooked; 5 mm long overall. Lateral lemma awns 3–4 mm long; shorter than principal. Palea 0.6–0.7 length of lemma. Palea keels ciliate. Palea apex lobed; 2 -fid. Apical sterile florets resembling fertile though underdeveloped.

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

FRUIT Caryopsis with adherent pericarp; ellipsoid; dorsally compressed; 2.5–3 mm long.

DISTRIBUTION Australasia: Australia.

NOTES Cynodonteae. Gardner.

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