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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 biannulare

HABIT Perennial; caespitose. Basal innovations intravaginal. Culms 40–85 cm long. Leaf-sheaths glabrous on surface. Ligule a fringe of hairs; 0.3–0.5 mm long. Leaf-blades involute; 15–30 cm long; 1–2 mm wide. Leaf-blade surface glabrous. Leaf-blade margins scabrous.

INFLORESCENCE Inflorescence a panicle.

Panicle contracted; lanceolate; 10–20 cm long. Panicle axis scabrous.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels scabrous.

FERTILE SPIKELETS Spikelets comprising 6–7 fertile florets; with diminished florets at the apex. Spikelets cuneate; laterally compressed; 7.6–11 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes 0.3–0.4 mm long. Floret callus evident; 0.5–0.7 mm long; pilose.

GLUMES Glumes persistent; similar; exceeding apex of florets; thinner than fertile lemma. Lower glume lanceolate; 7.6–11 mm long; 1 length of upper glume; membranous; without keels; 5–7 -veined. Lower glume apex acute. Upper glume lanceolate; 7.6–11 mm long; 1.2–1.5 length of adjacent fertile lemma; membranous; without keels; 5 -veined. Upper glume apex acute.

FLORETS Fertile lemma oblong; 6–7.5 mm long; chartaceous; without keel; 7–9 -veined. Lemma surface pubescent; with 2 transverse rows of hair tufts. Lemma margins ciliate. Lemma apex lobed; 2 -fid; with lobes 4–5 mm long; incised 0.66 of lemma length; awned; 3 -awned. Principal lemma awn from a sinus; geniculate; 6–12.5 mm long overall; with twisted column. Column of lemma awn 2.5–3 mm long. Lateral lemma awns arising on apex of lobes; 2–3 mm long; shorter than principal. Palea 2.5–4 mm long. Palea keels ciliolate. Palea surface pilose; hairy on flanks. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Lodicules 2; fleshy; ciliate. Anthers 3; 0.8–1.5 mm long.

FRUIT Caryopsis with adherent pericarp; 1.7–1.9 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.