Sporobolus contractus

Common names: Spike dropseed
Synonyms: Sporobolus cryptandrus var. strictus
Treatment appears in FNA Volume 25. Treatment on page 129.

Plants perennial; cespitose, not rhizomatous. Culms 40-100 (120) cm tall, 2-4(5) mm thick near the base. Sheaths rounded below, margins hairy, partic¬ularly distally, hairs to 3 mm, apices with conspicuous tufts of hair; ligules 0.4-1 mm; blades (2)4-35 cm long, 3-8 mm wide, flat to involute, glabrous on both surfaces, margins whitish, somewhat scabridulous. Panicles all terminal, (10)15-45(50) cm long, 0.2-0.8(1) cm wide, contracted, spikelike, dense, usually included in the uppermost sheath; lower nodes with 1-2(3) branches; primary branches 0.3-1.5 cm, appressed, spikelet-bearing to the base; secondary branches appressed; pulvini glabrous; pedicels 0.2-2 mm, appressed, scabridulous. Spikelets 1.7-3.2 mm, whitish to plumbeous. Glumes unequal, narrowly lanceolate, membranous, prominently keeled; lower glumes 0.7-1.7 mm, usually 1-veined, acute to acuminate; upper glumes 2-3.2 mm, at least 2/3 as long as the florets; lemmas 2-3.2 mm, linear-lanceolate, membranous, glabrous, acute; paleas 1.8-3 mm, linear-lanceolate, membranous, glabrous; anthers 3, 0.3-0.5 mm, light yellowish. Fruits 0.8-1.2 mm, ellipsoid, laterally flattened, light brownish or translucent. 2n = 36.


Maine, N.J., Mich., Wash., N.Mex., Tex., Utah, Calif., Okla., N.Y., Colo., Ariz., Nev., Conn.


Sporobolus contractus grows in dry to moist, sandy soils, at elevations from 300-2300 m. It is found occasionally in salt-desert scrub, desert grasslands, and pinyon-juniper woodlands. Its range extends to the states of Baja California and Sonora in Mexico.

Selected References


Lower Taxa

... more about "Sporobolus contractus"
Paul M. Peterson +, Stephan L. Hatch +  and Alan S. Weakley +
Hitchc. +
Spike dropseed +
Maine +, N.J. +, Mich. +, Wash. +, N.Mex. +, Tex. +, Utah +, Calif. +, Okla. +, N.Y. +, Colo. +, Ariz. +, Nev. +  and Conn. +
Sporobolus cryptandrus var. strictus +
Sporobolus contractus +
Sporobolus +
species +