Plants perennial; cespitose, not rhizomatous. Culms (30)40-100 cm.
Sheaths rounded below, margins and apices sometimes sparsely ciliate; ligules
0.1-0.2 mm; blades (6)10-30 cm long, 0.8-2 mm wide, flat to tightly involute,
glabrous abaxially, scabridulous adaxially, margins scabrous, apices pungent.
Panicles 7-28 cm long, 2-6 cm wide, open, pyramidal; lower nodes
with 3 or more branches; primary branches 0.7-4.5 cm, spreading 20-100°
from the rachis, whorled or verticellate, without spikelets on the lower 1/8-1/2;
secondary branches appressed; pedicels 0.4-2.5 mm, appressed, scabridulous.
Spikelets 2.6-3.8 mm, purplish-red. Glumes unequal, linear-lanceolate
to lanceolate or ovate, hyaline to membranous; lower glumes 0.9-3 mm; upper
glumes 2.6-3.8 mm, as long as or longer than the florets; lemmas 2-3.6
mm, ovate, membranous, glabrous, acute; paleas 2-3.6 mm, ovate, membranous;
anthers 1.4-2 mm, purplish. Fruits 1.4-1.8 mm, ellipsoid, somewhat
laterally flattened, somewhat rugulose, reddish-brown. 2n = unknown.
Sporobolus junceus grows in openings in pine and hardwood forests, coastal
prairies, and pine barrens, usually in sandy to loamy soils, at 2-400 m. Its range
lies entirely within the southern United States.
Tufted perennial 3-10 dm, with erect slender culms; lvs 1-3 dm, very narrow, involute, crowded toward the base; panicle cylindric, 8-25 נ1-4 cm, its branches regularly whorled, spreading or ascending, 1-3 cm, racemiform, bearing scattered, ±secund, bronze-brown spikelets 2.5-3.7 mm on short (mostly under 1 mm) pedicels in the distal half; first glume lanceolate, acute or obtuse, 1.2-3 mm; second glume acute, about equaling the lemma. Pine-barrens of the coastal plain; se. Va. to Fla. and Tex. (S. gracilis)
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.