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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 pinetorum

HABIT Perennial; caespitose. Butt sheaths indurate; glossy. Culms erect; 30–80 cm long; 1–3 mm diam. Culm-internodes elliptical in section; distally glabrous. Leaf-sheaths glabrous on surface to pubescent. Leaf-sheath oral hairs ciliate; 2–4 mm long. Ligule a fringe of hairs; 2–4 mm long. Leaf-blades flat, or conduplicate, or involute; 40–50 cm long; 1.5–2(–3) mm wide; dark green. Leaf-blade surface glabrous; hairless throughout, or except near base. Leaf-blade margins scaberulous.

INFLORESCENCE Inflorescence a panicle.

Panicle open, or contracted; ovate, or pyramidal; 15–30 cm long; 2–6 cm wide. Primary panicle branches ascending, or spreading; 2–8 cm long. Panicle axis scaberulous. Panicle branches glabrous in axils, or pubescent in axils.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels 2–22 mm long.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets lanceolate; subterete; 3.5–6.5 mm long; breaking up at maturity; disarticulating below each fertile floret.

GLUMES Glumes deciduous; reaching apex of florets. Lower glume lanceolate; 2.4–4.5 mm long; 0.6–0.8 length of upper glume; membranous; without keels; 1 -veined. Lower glume lateral veins absent. Lower glume apex acuminate. Upper glume lanceolate; 3.5–6.5 mm long; 1–1.5 length of adjacent fertile lemma; membranous; without keels; 1 -veined. Upper glume lateral veins absent. Upper glume apex acute, or acuminate.

FLORETS Fertile lemma lanceolate, or ovate; 3.4–4.3 mm long; membranous; without keel; 1 -veined. Lemma surface glabrous. Lemma apex acute. Palea ovate; 3.4–4.4 mm long; 1 length of lemma; 2 -veined. Palea keels approximate. Palea surface glabrous. Palea apex entire, or dentate; 2 -fid; truncate, or obtuse.

FLOWER Anthers 3; 2.5–3.4 mm long; purple.

FRUIT Caryopsis with free soft pericarp; fusiform; 1.8–2.2 mm long.

DISTRIBUTION North America: southeast USA.

NOTES Eragrostideae. Weak. & Pet. 1999.

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