18. Corispermum puberulum Iljin, Izv. Glavn. Bot. Sada SSSR. 28: 645. 1929.
软毛虫实 ruan mao chong shi
Corispermum puberulum var. ellipsocarpum C. P. Tsien & C. G. Ma.
Plants 15-35(-50) cm tall. Stem erect, branched mostly from base; lowest branches ascending, upper ones obliquely spreading. Leaves linear, 2.5-4 cm × 3-5 mm, 1-veined, base attenuate, apex acuminate, mucronate. Spikelike inflorescence terete or clavate, straight or slightly curved, crowded, usually 3-5(-7) × ca. 0.8 cm; bracts lanceolate to ovate, 0.5-1.5 cm × 3-4 mm, 1-3-veined, base rounded, margin membranous, apex acute or acuminate. Perianth segments 1-3, upper one broadly elliptic or suborbicular, apex irregularly denticulate, lower segments smaller or not developed. Stamens 1-5. Utricle broadly elliptic or obovate-oblong, 3.5-4(-4.5) × 2.8-3.5 mm, few tuberculate or dark punctate abaxially, hairy or sometimes glabrous, base truncate or caudate, apex distinctly emarginate; wing broad, 1/2-2/3 as wide as body, margin irregularly denticulate; beak apex 1/4-1/3 as long as beak. Fl. and fr. Jul-Sep.
* Sandy places on riversides and beaches. Hebei (Weichang), Heilongjiang (Harbin), W Liaoning, E Shandong (Yantai).
Corispermum puberulum was treated as a synonym of C. elongatum by Grubov (Rast. Tsentral. Azii 2: 54. 1966), who also noted the extreme variability in pubescence and dimensions of the utricle. However, Baranov (J. Jap. Bot. 44: 165–166, 199–200, 203–204. 1969) indicated some differences in utricle characters of these two entities and treated them as two distinct species.
Taller plants (30–50 cm) with longer inflorescences (5–7 cm) and larger (3.7–4.5 × 2.8–3.2 mm), glabrous utricles were described as Corispermum puberulum var. ellipsocarpum and reported from Hebei (Weichang), W Liaoning, and Heilongjiang (Harbin). The typical variety is reported from Heilongjiang (Harbin) and E Shandong (Yantai).