﻿32 Vail: Studies in the Asclepiadaceae. 





i. Acerates lanuginosa (Nutt) Dec. ; DC. Prodr. 8:523. 



1 844. 



Asclepias lanuginosa Nutt. Gen. 1:168. 3 Ap. 181 8. Not 

 H.B.K. 1818. 



Asclepias Nuttalliana Torr. Ann. Lye. N. Y. 2 : 218. 1828. 

 Not A. Gray, Man. Ed. 2, 352 and 704. 1856. 



Polyotus lanuginosns Nutt. Trans. Am. Phil. Soc. 5 : 200. 1834. 



Acerates monocephala Lapham ; A. Gray, Man. Ed. 2:704. 

 1856. 



Hirsute-pubescent throughout with weak spreading hairs. 

 Stems erect, angled, 1-3 dm. high ; leaves opposite or some of 

 them alternate and scattered, very short-petioled, oblong-ovate to 

 lanceolate, 4-7 cm. long, obtuse or acutish or sometimes with a 

 rounded base ; umbel terminal, solitary, mostly many-flowered ; 

 corolla greenish, the segments 4 mm. long ; column obsolete ; 

 hoods shorter than the anther-wings, oblong, almost petaloid, entire, 

 solid up the base of the anther-wings, the obtuse apex sometimes 

 recurved backwards, the ventral margins infolded with a small 

 concealed auricle toward the base ; accessory processes small, 

 obtuse; pollinia 1.2 mm. long, attenuate upwards; anther-wings 

 salient and obtusely angled towards the base, entire ; follicles on 

 recurving pedicels. Mature fruit not seen. 



Prairies, Wisconsin and Northern Illinois to Missouri at White 

 River (Nuttall); Yellowstone (Allen); "On the Canadian " (James). 

 Summer. 



Illustration : Britt. & Brown, 111. Fl. 3; /. 2028. 1898. Ined. 



2. Acerates Floridana (Lam.) A. S. Hitchcock, Trans. St. Louis 



Acad. 5 : 508. 1891. 



Asclepias Floridana Lam. Encycl. 1 : 284. 1783. 

 Asclepias incarnata Walt. Fl. Car. 106. 1788. Not. L. 1753- 

 Acerates longifolia Ell. Bot. S. C. &Ga. 1:317. 181 7. 

 Polyotus longifolins Nutt. Trans. Am. Phil. Soc, Ser. 2, 5 : 200. 



1834. 



Oligoron longifoliitm Raf. New Fl. Am. 4: 60. 1836. ? 



Minutely scabrous-pubescent, becoming glabrate. Stems erect 

 or ascending, 3-8 dm. high or more; leaves linear to elongated 

 linear- lanceolate, 7-16 cm. long, 3-1.5 cm. wide; umbels 2 or y 

 several, usually many-flowered; peduncles 5 mm. to 4 cm. long; 

 pedicels slender, I— 1 .3 cm. long; corolla-segments oblong, about 

 3 mm. long, dull purple on the outer surface; hoods purplish, oval, 



