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GrassBase - The Online World Grass Flora
Descriptions
W.D. Clayton, M. Vorontsova, K.T. Harman & H. Williamson
© Copyright The Board of Trustees, Royal Botanic Gardens, Kew.
Sporobolus interruptus
HABIT Perennial; caespitose; clumped densely. Culms erect; 30–60 cm long. Culm-internodes smooth. Lateral branches lacking. Leaves mostly basal. Leaf-sheaths glabrous on surface, or pilose. Leaf-sheath oral hairs ciliate. Ligule a fringe of hairs. Leaf-blades erect; flat, or conduplicate; 10–15 cm long; 1–2 mm wide. Leaf-blade surface glabrous, or pilose; sparsely hairy.
INFLORESCENCE Inflorescence a panicle.
Panicle open; elliptic; 10–20 cm long. Primary panicle branches ascending, or spreading; distant; 1 -nate. Panicle axis smooth.
Spikelets solitary. Fertile spikelets pedicelled.
FERTILE SPIKELETS Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets lanceolate; subterete; 6 mm long; breaking up at maturity; disarticulating below each fertile floret.
GLUMES Glumes deciduous; reaching apex of florets. Lower glume lanceolate; 2–3 mm long; 0.5 length of upper glume; membranous; without keels. Lower glume apex acute. Upper glume elliptic; 1 length of adjacent fertile lemma; membranous; without keels; 1 -veined. Upper glume lateral veins absent. Upper glume apex acute.
FLORETS Fertile lemma ovate; 6 mm long; membranous; without keel; 1 -veined. Lemma apex acute. Palea 1 length of lemma; 2 -veined. Palea keels approximate.
FRUIT Caryopsis with free soft pericarp.
DISTRIBUTION North America: southwest USA.
NOTES Eragrostideae. N Amer Fl 1994.
Please cite this publication as detailed in How to Cite Version: 3rd February 2016.