2(1). Annual; stems usually hirsute; leaves ovate to ovate-elliptic. ...2. H. uniflora. 



2. Perennials or annuals; stems usually glabrous; leaves linear to lanceolate (3) 



3(2). Perennial; flowers solitary or in small clusters, subsessile; capsules short- 

 ciliate or glabrous; frequent in east Texas 3. H. Boscii. 



3. Annual; flowers in 3-flowered cymes, occasionally solitary, the peduncles and 



pedicels (when present) each to 15 mm. long; very rare 



4. H. corymbosa. 



1. Hedyotis pygmaea R. «& S. 



Cespitose perennial, 5-10 cm. high; numerous stems erect or spreading, scaberu- 

 lous or papillose; leaves linear, the lowest often spatulate, 5-25 mm. long, 0.5-3 

 mm. wide, usually scaberulous; flowers axillary or usually in terminal cymes, the 

 short peduncles recurved after anthesis; calyx lobes 1.5-2 mm. long; corolla 

 salverform, white to pale-purple, 4-7 mm. long, the lobes equal to or commonly 

 shorter than the tube, papillose within; capsule to 3.5 mm. in diameter, sub- 

 didymous, broader than long, minutely papillose, about one-fourth inferior, the 

 seeds crateriform. Hoiistonia Wrightii Gray, Hedyotis Wrightii (Gray) Fosb. 



Open hillsides, rocky canyon slopes and sandy mt. streams, wet meadows, in 

 muddy seepage about springs, and chaparral, infrequent in cen. Tex. Trans-Pecos 

 and Ariz. (Pima Co.), June-July; from Tex. to cen. Ariz.; also Mex. (to Pue. 

 and Ver.) 



2. Hedyotis uniflora (L.) Lam. Fig. 723. 



Erect to usually spreading summer annual; stems often branched, 1-6 dm. 

 long, white-hirsutulous along the angles to less frequently glabrate; leaves ovate to 

 ovate-elliptic, 1-2.5 cm. long, the midveins and margins commonly white- 

 hirsutulous, the petioles 1-2.5 mm. long or rarely absent; flowers very small, 

 homostylous, axillary in small or large clusters or rarely solitary, subsessile; corolla 

 rotate, white, about 1 mm. long, shorter than the calyx lobes; capsule to 2 mm. 

 broad, usually densely white-hirsutulous, more or less wholly inferior, the angular 

 seeds very numerous. Oldenlandia uniflora L. 



On wet sandy-loam banks, in shallow water of ponds and bogs, on floating mats 

 of vegetation in lakes, in e. Tex. and Okla. (McCurtain Co.), June-Sept.; from 

 Fla. to Tex., n. to s. N.Y., Okla. and s.e. Mo. 



Var. fasciculata (Bert.) W. H. Lewis. Stems, leaves and usually capsules 

 glabrous; leaves sessile. Infrequent on Gulf Coast, Fla. to Tex. 



3. Hedyods Boscii DC. Fig. 723. 



Prostrate or spreading perennial; stems branched and often cespitose, 1-3 dm. 

 long, glabrous to infrequently hirtellous; leaves mostly linear, 10-25 mm. long, 

 1-3 mm. wide, glabrous, sessile or subsessile; flowers very small, homostylous, 

 axillary in small clusters or solitary, subsessile; corolla rotate, white (lobes often 

 tipped pink), about 1 mm. long, shorter than the calyx lobes; capsule to 2.5 

 mm. broad, glabrous or short-ciliate, more or less wholly inferior, the seeds 

 angular and very numerous. Oldenlandia Boscii (DC.) Chapm. 



Edges of ponds and rivers in lowlands and savannahs of e. Tex., rare in s.-cen. 

 Tex. and Okla. (McCurtain and LeFlore cos.), May-Aug.; from Fla. to Tex., n. 

 to s.e. Va., Tenn., s.e. Mo. and Okla. 



4. Hedyotis corymbosa (L.) Lam. Fig. 724. 



Erect or spreading summer annual; stems branched, glabrous; leaves linear to 

 lanceolate, 1-3.5 cm. long, 1-5 mm. wide, the margins scaberulous; flowers small, 

 homostylous, axillary, usually in 3-flowered cymes or solitary, the peduncles to 

 15 mm. long, the pedicels often as long; corolla more or less salverform, white, 



1545 



