﻿34 Vail: Studies in the Asclepiadaceae. 



6-io cm. long, erect on recurved pedicles, fusiform, attenuate, 

 glabrous or minutely puberulent; seeds 7 mm. long ; coma'2.5-3 

 cm. long. Very variable and intergrading with the two varieties. 



Dry and sterile soil, New England to Saskatchewan, southward 

 to Florida, Texas, New Mexico and North Mexico. June to 

 September. 



Illustrations : Torr. Fl. N. Y. 2: pi. 88. 1843. In part. Hook, 

 Fl. Bor. Am. 2: pi. 14.J. 1844. In part. Britt. & Brown, 111. 

 Fl. 3 ; /. 2g2±. 1898. Ined. 



Forms with broadly oval or oblong, obtuse or retuse leaves. 

 Nezv York: Torrey ; Staten Island, T. H. Kearney, Jr. Penn- 

 sylvania: Conewago Co., Small, 1889. Georgia: Boykin ; Gwin- 

 nett Co., Small, 1893. Texas : Kerrville, Heller, no. 191 3, 1894. 

 New Mexico: Wright, no. 1693. I n part. 



Forms with broadly oblong, acute or acutish leaves. 

 Nebraska: Wilcox, 1888; Banner Co., Rydberg, no. 231, 

 1 89 1. Kansas: Fort Riley, E. E. Gayle, 1892 ; Osborne Co., C. 

 L. Shear, no. 102. 1894. Illinois: Augusta, S. B. Mead.no. 1043. 

 Arkansas: Nuttall. North Carolina: Rowan Co., Heller, no. 125. 

 1890. Ilorida: Marianna, Chapman. Louisiana: Alexandria, 

 Hale; Carpenter, no. 43. Texas : San Diego, Miss Croft. 



Acerates viridiflora Ivesii Britt., Mem. Torr. Club, 5: 265. 



1894. 



Asclepias lanceolata Ives, Am. Journ. Sci. 1 : 252. 1 8 19. Not 

 Walt. 1788. 



Asclepias viridiflora var. lanceolata Torr. Fl. N. Y. 284. 1 844. 

 Acerates viridiflora var. lanceolata Torr. in A. Gray, Syn. Fl. 2 : 

 Part I., 90. 1878. 



Leaves lanceolate, 5-10 cm. long, often much elongated ; anther- 

 wings tapering rather more abruptly at the base. Otherwise as 

 in the type, with the same range and occurring with it. 



Illustrations: Ives, Am. Journ. Sci. 1 : 252. 1819. Torr. 

 Fl. N. Y. 2 : //. 88. 1843. In part. Hook. Fl. Bor. Am. 2 : // 

 14J. 1844. In part. 



Rocky Mountains: Fremont, 1842. Nebraska: A. B. Show; 

 Banner Co., Rydberg, no. 232, 1891 ; Plummer Ford, Rydberg, 

 no. 1306, 1893. Kansas: Fort Riley, no. 519, 1892. Illinois: 



