Index Seminum (St. Petersburg) 1838: 39. 1839.
Annuals; roots taproots, slender. Stems 0–10 mm. Leaves 60–120 × 4–10 mm; blade linear, margins toothed (teeth to 4 mm), rarely entire, veins conspicuous or not, surfaces villous or sericeous. Scapes 280–580 mm, hairy, hairs antrorse, long and short. Spikes greenish or brownish, 50–180 mm, densely flowered, flowers in whorls or pairs; bracts ovate or triangular, 1.5–6 mm, length 0.6–1.4 times sepals, apex acute or acuminate. Flowers: sepals 2.5–4 mm; corolla bilaterally symmetric, abaxial and lateral lobes reflexed, adaxial erect, 2.2–2.5 mm, base slightly cordate; stamens 4, connective significantly elongated, apex acute. Seeds 2, 2.4–3.4 mm. 2n = 20.
Phenology: Flowering spring.
Habitat: Sandy soils, disturbed areas.
Elevation: 0–1300 m.
La., Miss., Tex., Mexico (Chihuahua), Mexico (Coahuila), Mexico (Nuevo León), Mexico (Tamaulipas)
"-1.4timessepals" is not declared as a valid unit of measurement for this property.