31 4 FLORA OF TEXAS. 



few 01* many, wingless. — Chiefly small herbs, with opposite 

 leaves; stipules united with the petioles, sometimes fringed 

 with bristles ; flowers small, white or purplish. 



* Corolla saher-sJiaped, longer than the calyx, smooth ; flowers dimorphous, some of 

 the7n bearing exd-erteU stamen^ and an included style, uhile others bear in- 

 cluded stamens and an ex^tfitd style; pedunclei axillary, solitary ; capsule 

 broad, free at the apex. 



0. CCERULEA, Gray. Annual or biennial, smooth; stems 

 tufted, forking; leaves lanceolate, those at the base spatu- 

 late, clustered; peduncles elongated, erect or spreading. 

 (Houstonia coerulea, L. ; H. patens, Ell.) Moist banks. 

 Stems 3'-G' high; corolla blue or white, yellow in the 

 throat. 



0. SERPYLLIFOLIA, Gray. Perennial, smooth; ste7ns 

 filiform, prostrate, branching; leaves ovate or roundish, 

 abruptly contracted into a long and slender petiole ; 2^ediin- 

 cles elongated, terminal and in the forks of the stem. 

 (Houstonia serpylli folia, Michx.) High mountains. Stems 

 6-12' long ; peduncles l'-2' long. 



** Corolla funnfl-shaped ; flaicers diceciously dimorphous ; capsule free at the 

 apex ; stem Wrangled ; flowers in terminal cymes. 



0. PURPUREA, Gray. Pubescent ; stem branching, erect; 

 leaves ovate or lanceolate-ovate, sessile, 3-5-ribbed; calyx- 

 lobes longer than the capsule; corolla purple or nearly 

 white, slightly hairy within ; capsule roundish. (Hous- 

 tonia purpurea, L.) Woods. Stems 8-12' high ; calyx- 

 lobes occasionally 3-4 times the length of the capsule. 



0. AXGUSTIFOLIA, Gray. Smooth ; root woody ; stems 

 clustered, erect, branching above ; leaves linear ; cymes 

 crowded, with the central flowers nearly sessile; corolla 

 white, very hairy v/ithin ; capsule ovoid, as long as the 

 calyx-teeth. (Hedyotis stenophylla, Torr. and Gray.) Sandy 

 pine-barrens. Stems l°-2° high. Red River. — Marcy. 



Var. FILIFOLIA. Stem shrubby at the base, diffusely 

 branched ; leaves filiform, remote ; cymes scattered, 3-flow- 



