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Descriptions

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

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

Eriachne aristidea

HABIT Annual, or perennial; short-lived; caespitose; clumped loosely. Cataphylls evident. Culms geniculately ascending; 10–40 cm long; 1–3 -noded. Culm-nodes bearded. Lateral branches lacking, or sparse. Leaf-sheaths glabrous on surface, or hispid; with tubercle-based hairs. Leaf-sheath oral hairs bearded. Ligule a fringe of hairs. Leaf-blades flat, or conduplicate, or involute; 7–14 cm long; 3–6 mm wide. Leaf-blade margins cartilaginous.

INFLORESCENCE Inflorescence a panicle. Peduncle glabrous, or pubescent above.

Panicle open; elliptic; 5–10 cm long; 2.5–4.5 cm wide. Panicle axis pubescent. Panicle branches pubescent.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels 1–8 mm long; pubescent; tip widened.

FERTILE SPIKELETS Spikelets comprising 2 fertile florets; without rhachilla extension. Spikelets ovate; laterally compressed; compressed slightly; 8–10 mm long; breaking up at maturity; disarticulating below each fertile floret. Spikelet callus attached obliquely.

GLUMES Glumes persistent; similar; exceeding apex of florets; thinner than fertile lemma. Lower glume lanceolate, or ovate; 1 length of upper glume; membranous; without keels; 11–13 -veined. Lower glume lateral veins prominent. Lower glume surface pilose; with tubercle-based hairs. Lower glume apex acuminate. Upper glume lanceolate, or ovate; 8–10 mm long; membranous; with hyaline margins; without keels; 11–13 -veined. Upper glume lateral veins prominent. Upper glume surface pilose; with tubercle-based hairs. Upper glume apex acuminate.

FLORETS Fertile lemma ovate; laterally compressed; 7–9 mm long; coriaceous; without keel. Lemma surface villous; hairy below. Lemma margins involute. Lemma apex acute; awned; 1 -awned. Principal lemma awn 7–9 mm long overall. Palea 1 length of lemma; cartilaginous. Palea surface villous; hairy below. Palea apex awned; awns 3–4 mm long.

FRUIT Caryopsis with adherent pericarp; obovoid; 3–3.5 mm long; obtuse.

DISTRIBUTION Australasia: Australia.

NOTES Eriachneae. Gr C Austral 1994.

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