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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 nardifolium

HABIT Perennial; caespitose. Basal innovations intravaginal. Culms 10–22 cm long. Leaf-sheaths smooth; glabrous on surface. Leaf-sheath oral hairs ciliate; 1–3.5 mm long. Ligule a fringe of hairs; 0.4–0.5 mm long. Leaf-blades straight; deciduous at the ligule; filiform; involute; 6–11 cm long; 0.3–0.6 mm wide; stiff. Leaf-blade surface smooth; glabrous.

INFLORESCENCE Inflorescence a panicle; comprising 4–5 fertile spikelets. Peduncle pubescent above.

Panicle bearing few spikelets. Panicle axis puberulous.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 6–7 fertile florets; with diminished florets at the apex. Spikelets elliptic; laterally compressed; 13–14 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes 0.5–0.6 mm long. Floret callus 0.25 mm long; pubescent; obtuse; disarticulating obliquely.

GLUMES Glumes persistent; similar; shorter than spikelet; similar to fertile lemma in texture. Lower glume lanceolate, or ovate; 7–8 mm long; 1.1–1.2 length of upper glume; chartaceous; much thinner on margins; without keels; 5 -veined. Lower glume apex erose; acute. Upper glume lanceolate, or ovate; 6–7.5 mm long; 0.9 length of adjacent fertile lemma; chartaceous; with scarious margins; without keels; 5–7 -veined. Upper glume apex acuminate.

FLORETS Fertile lemma oblong; 7–8 mm long; membranous; without keel; 9 -veined. Lemma surface smooth; with marginal hair tufts; bearing 2–4 hair tufts in all. Lemma hairs 1–2.5 mm long. Lemma apex dentate; 2 -fid; awned; 3 -awned. Principal lemma awn from a sinus; 7.5 mm long overall. Lateral lemma awns arising on apex of lobes; 3.25–4 mm long; shorter than principal. Palea 3 mm long. Palea keels ciliolate; adorned above. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Lodicules 2; oblong; 0.4 mm long; fleshy; glabrous. Anthers 3.

FRUIT Caryopsis with adherent pericarp.

DISTRIBUTION Asia-tropical: Papuasia.

NOTES Arundineae. Alp Fl N Guin 1999.

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