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Descriptions

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

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

Rytidosperma setaceum

HABIT Perennial; caespitose. Culms erect; slender; 15–60 cm long; 2–4 -noded. Culm-nodes glabrous. Leaf-sheaths glabrous on surface, or hirsute; with tubercle-based hairs. Ligule a fringe of hairs; 0.5 mm long. Leaf-blades straight, or curved; filiform; involute; 5–20 cm long; 1 mm wide. Leaf-blade surface ribbed; scabrous; rough adaxially; glabrous, or hirsute; with tubercle-based hairs.

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

Panicle contracted; linear to elliptic; 3–9 cm long. Panicle branches pubescent.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 4–10 fertile florets; with diminished florets at the apex. Spikelets cuneate; laterally compressed; 8–14 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus evident; 0.5–0.75 mm long; pubescent.

GLUMES Glumes persistent; similar; exceeding apex of florets; thinner than fertile lemma. Lower glume linear, or lanceolate; 8–14 mm long; 1 length of upper glume; membranous; without keels; 3–5 -veined. Lower glume apex acute, or acuminate. Upper glume linear, or lanceolate; 8–14 mm long; 2 length of adjacent fertile lemma; membranous; without keels; 3–5 -veined. Upper glume apex acute, or acuminate.

FLORETS Fertile lemma lanceolate, or elliptic; 4–6 mm long; chartaceous; without keel; 9 -veined. Lemma surface with 2 transverse rows of hair tufts. Lemma hairs 2–3 mm long. Lemma apex lobed; 2 -fid; with lobes 2–3 mm long; incised 0.5 of lemma length; awned; 3 -awned. Principal lemma awn from a sinus; geniculate; 5–9 mm long overall; with twisted column. Lateral lemma awns arising on apex of lobes; 4–6 mm long. Palea oblong, or oblanceolate; 2.5 mm long. Palea keels ciliolate. Palea apex obtuse. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Lodicules 2; fleshy; ciliate. Anthers 3; 0.75 mm long.

FRUIT Caryopsis with adherent pericarp; oblong; 1–1.5 mm long.

DISTRIBUTION Australasia: Australia.

NOTES Arundineae. Vickery 1993.

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