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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 corinum

HABIT Perennial; caespitose. Basal innovations intravaginal. Culms 10–25 cm long. Ligule a fringe of hairs; 0.5 mm long. Leaf-blades deciduous at the ligule; aciculate; involute; 7–15 cm long; 1 mm wide; stiff. Leaf-blade margins scabrous. Leaf-blade apex pungent.

INFLORESCENCE Inflorescence a panicle. Peduncle scaberulous above.

Panicle contracted; lanceolate; 2–6 cm long; bearing few spikelets. Panicle branches scaberulous; glabrous in axils, or pubescent in axils.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels scaberulous.

FERTILE SPIKELETS Spikelets comprising 4–5(–6) fertile florets; with diminished florets at the apex. Spikelets cuneate; laterally compressed; 9–11 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes 0.6–0.9 mm long. Floret callus evident; 0.4 mm long; pubescent.

GLUMES Glumes persistent; similar; exceeding apex of florets; thinner than fertile lemma. Lower glume lanceolate; 9–11 mm long; 1 length of upper glume; membranous; without keels; (3–)5(–7) -veined. Lower glume apex acute. Upper glume lanceolate; 9–11 mm long; 1.5–1.8 length of adjacent fertile lemma; membranous; without keels; 3 -veined. Upper glume apex acute.

FLORETS Fertile lemma oblong; 5–7.5 mm long; chartaceous; without keel; 9 -veined. Lemma surface with 2 transverse rows of hair tufts. Lemma apex lobed; 2 -fid; with lobes 3–5 mm long; incised 0.6–0.7 of lemma length; awned; 3 -awned. Principal lemma awn from a sinus; geniculate; 7–8.5 mm long overall; with twisted column. Column of lemma awn 2–2.5 mm long. Lateral lemma awns arising on apex of lobes. Palea 3.5–4 mm long. Palea keels ciliolate. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Lodicules 2; fleshy; ciliate. Anthers 3; 0.6–1 mm long; red.

FRUIT Caryopsis with adherent pericarp; 1.5–1.8 mm long.

DISTRIBUTION Australasia: New Zealand.

NOTES Arundineae. Connor & Edgar 1993.

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