77 

 Erythraea tricantha var. angustifolia Griseb. ; DC. Prodr. 9 : 60 



Hanging from wet limestone rocks on the left bank of the Guadalupe 

 at Kerrville. Radical leaves in rosulate tufts. 



July 2 (1940); type locality, "on the Washita." 

 Erythraea calycosa nana A. Gray, Syn. Fl. 2: 113 (1878). 



In rich, stony limestone soil, summits of hills about Kerrville, altitude 

 2000 feet. Plentiful, growing in patches. 



June 1 8 (1876); type locality, " \V. Texas." 



EUSTOMA Salisb. Parad. Lond. /. 34 (1806). 



Eustoma exaltata (L.) Griseb. DC. Prodr. 9: 51 (1845). 

 Geniiana exaltata L. Sp. PI. Ed. 2, 331 (1762). 

 Lisianthus exaltatus Lam. 111. I : 478 (1791). 

 Eustoma silcnifolium Salisb. Parad. Lond. /. 34 (1806). 

 In rich, grassy ground on the right bank of the San Antonio river, at 

 the Southern Pacific bridge at San Antonio. The large flowers are pale 

 mauve in color. Scarce. 

 June 9 (1834). 



ASCLEPIADACEAE. 



ASCLEPIAS L. Sp. PI. 214 (1753)- 

 Asclepias longicornu Benth. PL Hartw. 24 (1840). 



Near Corpus Christi, especially along the railroad. A low plant, de- 

 cumbent at base, from a thick and fleshy tuberous root. 



April 14 (1575); type locality, Mexico. 



Asclepias Texana n. sp. 



(PLATE 4 .) 



Perennial, the main root sending out fibrous rootlets ; stem erect, 

 slightly woody at base, two to three feet high, cymosely branched 

 above, glaucous, purplish below, green above and marked with one 

 or two pubescent lines, otherwise glabrous ; leaves opposite, oval or 

 ovate, acute or the lowest obtusish, and broader, somewhat oblique 

 at base ; petioles about one-fifth the length of the blade ; peduncles 

 comparatively stout, shorter than the leaves; umbels 15-20 flow- 

 ered, on pedicels nearly half the length of the peduncles ; flowers 

 white with prominently exserted horns. 



