Nodding Bluet

Houstonia subviscosa (C. Wright) A. Gray, Proc. Am. Acad. 4:
314. 1858.
Oldenlandia subviscosa C. Wright; A. Gray, PI. Wright. 2: 68. 1853.
Erect annual, 4-15 cm. high, sparsely branched, the branches slender, ascending, shorthirtellous with coarse whitish hairs, more or less viscid, the internodes mostly equaling or exceeding the leaves; stipules about 0.5 mm. long, scarious, setulose-ciliate; leaves opposite, sessile, linear, 5-15 mm. long, 1 mm. wide or narrower, acute, hirtellous and viscid or glabrate, the margins revolute; flowers axillary, solitary, the pedicels 3-8 mm. long, filiform, hirtellous or glabrate, recurved or refracted after anthesis or rarely only divaricate; hypanthium less than 1 mm. long, minutely viscid-hirtellous ; calyx-lobes lance-subulate, acute, slightly elongate in fruit; corolla salverform, 2.5-3 mm. long, white; capsule subdidymous, 2.5-4 mm. broad, scabro-hirtellous ; seeds cymbiform, rounded-oval, 1 mm. long, minutely scrobiculate, black.
Type locality: Between Lagrange and Lockhart Springs, Fayette County, Texas.
Distribution: Western Texas.