﻿Vail: Studies in the Asciepiadaceae. 33 



Wisconsin and 



obtuse, slightly pendulous at the base, ventral margins entire, ad- 

 nate at the base to the upper part of the distinct column, rising to 

 about the middle of the anthers ; anther- wings angled at the middle, 

 tapering to the longer base; follicles erect on recurved fruiting 

 pedicels, fusiform, 7-10 cm. long, minutely puberulent; seeds 7 

 mm. long; coma 3-4 cm. long. 



Prairies and wet pine barrens and swamps, 

 Ohio to Florida and Texas. June to September. 



Very variable as to height, width and length of foliage, and 

 also length of peduncles. The Florida form has a more distinctly 

 terminal inflorescence and longer peduncles. A specimen from 

 Louisiana with lanceolate leaves has peduncles 5-7 cm. long, and 

 was collected by Dr. Ingalls at New Orleans in 1834. 

 em form has sessile or very short peduncled umbels and more 

 truly lateral inflorescence. There seem to be, however, no differ- 

 ences in the flowers. 



Illustration : Britt. & Brown, III. Fl. 3 : / 2926. 1898. Ined. 



Michigan: Mr. Wright. 1838. Illinois: Dr. Scannon ; Win- 



West 



sonri : 



) Co., M. S. Bebb, 1871 ; Hillsgrove, Holton, 1850. Mis- 

 St. Louis, Engelm.; Jasper Co., B. F. Bush, no. 244, 1893. 

 Arkansas : Nuttall. South Carolina : St. John's, Porcher. Georgia : 

 Darien Junction, Mcintosh Co., J. K. Small, 1895. Louisiana: 

 Alexandria. Hale. Florida: St. Marks, Rugel, 1843; St. Au- 



M 



Man. Ed. 5, 90. 1829. 



1834. 



Asclepias tmidiflora Raf. Med. Rep. (2) 5 : 360- 1808. 

 Polyotus heterophyllus Nutt. Trans. Am. Phil. Soc. 5 : 1 99- 

 Tomentose-puberulent, becoming glabrate. Stems ascend- 

 ing. 2-6 dm. high, often procumbent; leaves opposite or some of 

 them scattered, short-petioled, 4-6 cm. long, oval or oblong, ob- 

 tuse and retuse or acutish, usually mucronate, sometimes with un- 

 dulate margins, becoming thick and coriaceous ; umbels globose, 

 sessile or nearly so, 2-5 or more, lateral, densely many-flowered : 

 pedicels 1 cm. long or less ; corolla-segments oblong-lanceolate, 

 about 5 mm. long; hoods inserted over the whole short column, 

 dull purplish, or at least tinged with purple, erect, nearly equalling 

 the anthers, lanceolate-oblong, entire, except for a pair of small 

 infolded and concealed auricles at the base ; accessory pro- 

 cesses 5 ; anther-wings salient above the middle, semi-rhomboid, 

 entire, or possibly obscurely notched, tapering toward the base; 

 pollinia 2-5 mm. long, attenuated to the short caudtcles; follicles 



