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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 unarede

HABIT Perennial; caespitose. Rhizomes short. Basal innovations extravaginal. Culms 35–85 cm long. Leaf-sheaths glabrous on surface, or pilose. Leaf-sheath oral hairs bearded; 4 mm long. Ligule a fringe of hairs; 0.2–0.8 mm long. Leaf-blades flat, or involute; 20–40 cm long; 2–3.5 mm wide. Leaf-blade surface glabrous. Leaf-blade margins scabrous.

INFLORESCENCE Inflorescence a panicle.

Panicle contracted; lanceolate; 7–18 cm long. Panicle axis scabrous.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels scabrous.

FERTILE SPIKELETS Spikelets comprising (3–)4–6(–8) fertile florets; with diminished florets at the apex. Spikelets cuneate; laterally compressed; 7.5–12 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes 0.4–0.6 mm long. Floret callus evident; 0.5–0.8 mm long; pilose.

GLUMES Glumes persistent; similar; exceeding apex of florets; thinner than fertile lemma. Lower glume lanceolate; 7.5–12 mm long; 1 length of upper glume; membranous; without keels; 5(–7) -veined. Lower glume apex acute. Upper glume lanceolate; 7.5–12 mm long; 1.2 length of adjacent fertile lemma; membranous; without keels; 5(–7) -veined. Upper glume apex acute.

FLORETS Fertile lemma oblong; 6–10 mm long; chartaceous; without keel; 9 -veined. Lemma surface with 2 transverse rows of hair tufts. Lemma apex lobed; 2 -fid; with lobes 4–7 mm long; incised 0.66 of lemma length; awned; 3 -awned. Principal lemma awn from a sinus; geniculate; 6–12 mm long overall; with twisted column. Column of lemma awn 1–3 mm long. Lateral lemma awns arising on apex of lobes. Palea 4–5 mm long. Palea keels ciliolate. Palea surface glabrous. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Lodicules 2; fleshy; ciliate. Anthers 3; 0.3–1.6 mm long.

FRUIT Caryopsis with adherent pericarp; 1.6–1.8 mm long.

DISTRIBUTION Australasia: Australia and New Zealand.

NOTES Arundineae. Connor & Edgar 1993.

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