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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 novoguineensis

HABIT Annual; caespitose. Basal innovations intravaginal. Culms erect; 25–55 cm long. Culm-internodes smooth; distally glabrous. Lateral branches sparse. Leaf-sheaths smooth; glabrous on surface; outer margin hairy. Leaf-sheath oral hairs scanty, or lacking. Ligule a fringe of hairs; 0.15 mm long. Leaf-blades linear, or lanceolate; 3–7 cm long; 1–4 mm wide; stiff. Leaf-blade surface scaberulous; rough adaxially; glabrous. Leaf-blade margins tuberculate-ciliate; hairy at base. Leaf-blade apex obtuse.

INFLORESCENCE Inflorescence a panicle.

Panicle contracted; linear; interrupted; 14 cm long; 1.5 cm wide. Primary panicle branches ascending; 10–12 -nate; whorled at most nodes; 0.6–2 cm long. Panicle axis 6–21 noded. Panicle branches capillary; eglandular, or glandular.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets lanceolate; subterete; 1.8–2.1 mm long; breaking up at maturity; disarticulating below each fertile floret.

GLUMES Glumes deciduous; similar; reaching apex of florets. Lower glume lanceolate; 0.85–1.25 mm long; 0.5–0.66 length of upper glume; hyaline; without keels; 0 -veined. Lower glume lateral veins absent. Lower glume surface smooth, or asperulous; rough above. Lower glume apex obtuse, or acute. Upper glume ovate; 1.8–2.1 mm long; 1 length of adjacent fertile lemma; hyaline; without keels; 1 -veined. Upper glume lateral veins absent. Upper glume surface smooth, or asperulous; rough above. Upper glume apex acute, or acuminate.

FLORETS Fertile lemma ovate; 1.8–2.1 mm long; membranous; without keel; 1 -veined. Lemma apex acute. Palea readily splitting down midline; ovate; 2 -veined. Palea keels approximate. Palea apex obtuse.

FLOWER Lodicules 2; 0.25 mm long. Anthers 3; 0.35–0.5 mm long.

FRUIT Caryopsis with free soft pericarp; ellipsoid; laterally compressed; 1.1–1.2 mm long. Embryo 0.5 length of caryopsis.

DISTRIBUTION Asia-tropical: Papuasia.

NOTES Eragrostideae. Baaijens 1997.

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