Stenaria umbratilis (B. L. Rob.) Terrell

Houstonia umbratilis B. L. Robinson, Proc. Am. Acad. 45: 401
1910.
Prostrate perennial, the stems herbaceous, branched, glabrous, the branches very slender,
matted, quadrangular, rooting at the nodes; stipules minute; leaves very shortly petiolate, the
blades ovate or broadly ovate, 2.5-4 mm. long, 1.8-3 mm. wide, rounded or obtuse at the base,
acute or acutish at the apex, green above and minutely scaberulous, slightly paler beneath and
glabrous, 1-nerved; flowers terminal, solitary or geminate, the pedicels filiform, 1.5 cm. long;
hypanthium turbinate; calyx-lobes lance-oblong, acute, twice as long as the hypanthium;
corolla funnelform, about 7 mm. long, the lobes ovate; anthers exserted, linear-oblong.
Type locality: Shaded cliffs of mountains near Monterrey, Nuevo Leon. Distribution: Known only from the type locality.

Stenaria umbratilis là một loài thực vật có hoa trong họ Thiến thảo. Loài này được (B.L.Rob.) Terrell mô tả khoa học đầu tiên năm 2001.