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Descriptions

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

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

Sporobolus amaliae

HABIT Annual; caespitose. Basal innovations intravaginal. Culms erect; 25–52 cm long. Culm-internodes smooth; distally glabrous. Leaf-sheaths smooth; glabrous on surface; outer margin hairy. Leaf-sheath oral hairs scanty, or lacking. Ligule a fringe of hairs, or absent; 0.05–0.15 mm long. Leaf-blades 5–9.5 cm long; 2–4.5 mm wide. Leaf-blade midrib keeled beneath. Leaf-blade surface scaberulous; rough adaxially; pubescent; sparsely hairy; hairy adaxially. Leaf-blade margins tuberculate-ciliate. Leaf-blade apex acuminate.

INFLORESCENCE Inflorescence a panicle.

Panicle open; lanceolate; effuse; 12 cm long; 4 cm wide. Primary panicle branches ascending; 13–20 -nate; whorled at most nodes; simple; 1.5–2.2 cm long; bearing 3–6 fertile spikelets on each lower branch. Panicle axis 10–13 noded. Panicle branches capillary.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels 0.5–0.75 mm long; smooth.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets lanceolate; subterete; 1.5–1.75 mm long; breaking up at maturity; disarticulating below each fertile floret.

GLUMES Glumes deciduous; similar; reaching apex of florets. Lower glume lanceolate, or ovate; 1–1.45 mm long; 0.66–0.9 length of upper glume; hyaline; purple; without keels; 0–1 -veined. Lower glume lateral veins absent. Lower glume surface smooth. Lower glume apex acuminate. Upper glume oblong, or ovate; 1.5–1.75 mm long; 1 length of adjacent fertile lemma; hyaline; purple; without keels; 1 -veined. Upper glume lateral veins absent. Upper glume surface smooth. Upper glume apex acute.

FLORETS Fertile lemma oblong, or ovate; 1.5–1.75 mm long; membranous; without keel; 1 -veined. Lemma apex obtuse. Palea readily splitting down midline; oblong; 1.4 mm long; 2 -veined. Palea keels approximate. Palea apex truncate, or obtuse.

FLOWER Lodicules 2; 0.25–0.3 mm long. Anthers 3; 0.3–0.5 mm long.

FRUIT Caryopsis with free soft pericarp; ellipsoid, or obovoid; isodiametric; quadrangular; 0.75–0.9 mm long. Embryo 0.5 length of caryopsis.

DISTRIBUTION Asia-tropical: Malesia.

NOTES Eragrostideae. Baaijens 1997.

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