On wet gravel-sand bars along the Rio Grande and tributaries in Brewster Co., 

 Tex., Feb.-Apr.; also Coah. 



5. Hydrolea L. 



Annual or perennial, usually spiny, aquatic or marsh herbs with alternate 

 entire leaves and corymbose or cymose blue flowers; calyx unappendaged, not 

 conspicuously accrescent; corolla rotate-campanulate, exeeding or equaling the 

 calyx; stamens included or exserted; corolla scales 0; styles distinct; capsule ovoid 

 or globose, many seeded, often dehiscing irregularly; seeds minute, striate or 

 rugose. 



Approximately 20 species, pantropical, but predominantly subtropical America. 



1. Plants essentially glabrous; leaves lanceolate; flowers in small axillary clusters, 

 the calyx essentially glabrous 3. H. uniflora. 



1. Plants conspicuously pubescent; leaves oblong to ovate; flowers in terminal 



clusters, the calyx hirsute (2) 



2(1). Foliage and inflorescence finely hirtellous; anthers slightly exserted 



1. H. ovata. 



2. Foliage and inflorescence hirsute and usually glandular; anthers included 



2. H. spinosa. 



1. Hydrolea ovata Choisy. Fig. 648. 



Stout erect spiny hirtellous perennial, from rhizomes that form colonies; 

 leaves 3-6 cm. long, 15-25 mm. wide; flowers bright blue or occasionally white, 

 showy, 15-25 mm. broad; sepals shorter than corolla. 



Edges of and in water of ponds, ditches and streams in Okla. (Atoka, Push- 

 mataha, McCurtain, Pittsburg, Sequoyah and Le Flore cos.) and e. and s.e. Tex., 

 Sept.-Oct.; La. to Tex., n. to Okla. and Ark. 



2. Hydrolea spinosa L. 



Stout erect usually very spiny perennial, hirsute and usually glandular; leaves 

 3-12 cm. long, 5-30 mm. wide; flowers showy, 1-1.5 cm. broad; sepals shorter 

 than corolla. 



In water, Cameron Co., Tex., June; s. to Mex., W.I., C.A. and S.A. 



3. Hydrolea uniflora Raf. Fig. 649. 



Slender weakly erect spiny glabrous perennial; leaves 5-8 cm. long, 1.5-2 cm. 

 wide; flowers rather inconspicouous, 1-1.5 cm. broad; sepals equaling corolla. 

 H. affinis Gray. 



Edges of and in shallow water of ponds and streams in s.e. Okla. {Waterfall) and 

 e. and s.e. Tex., Sept.-Oct.; n. Ark., Mo. and s. 111. 



A colony of plants found in Red River County, Texas represents what is un- 

 doubtedly the product of crossing between H . uniflora and H. ovata. The plants 

 are strikingly intermediate between these two species in pubescence and corolla. 



Fam. 114. Boraginaceae Juss. Borage Family 



Plants herbaceous, shrubby or arborescent, usually bristly; leaves simple, alter- 

 nate; flowers perfect, regular, solitary or cymose: cymes glomerate-racemose or 

 spicate. frequently unilateral and coiled (scorpioid), usually with bracts between, 

 to one side of, or opposite the flowers; calyx usually deeply lobed, somewhat irregu- 

 lar; corolla 5-lobed, commonly with folds or saccate-intruded appendages in the 

 throat; stamens 5. borne on the corolla tube alternate with the lobes; ovary superior, 

 bicarpellate, usually 4-ovulate, entire or lobed, becoming tough or bony at maturity; 

 fruit commonly breaking up into 4 single-seeded lobes (achenelike mericarps) or 

 remaining intact but the mesocarp becoming fleshy and the fruit thus drupaceous; 



1383 



