﻿Vail: Studies in the Asclepiadaceae. 35 



S. B. Mead. Connecticut: New Haven, Professor Ives (type). 

 Virginia: Lynchburg, Britton, 1892. Kentucky: Collector un- 

 known. Georgia: Small, 1893. Louisiana: Alexandria, Hale. 



Acf.rates viridiflora linearis A. Gray, Syn. Fl. 2 : Part L, 99. 



1878. 



Stems low ; leaves linear, elongated , umbels often solitary 

 Intcrgrades with the last. Said to occur from Minnesota and 



Manitoba to the Northwest Territory, south to Louisiana and New 

 Mexico. 



Missouri: B. F. Bush, no. 361, 1894. Louisiana: Alex- 

 andria, Hale. 



4. Acerates bifida Rusby ; A. Gray, Proc. Am. Acad. 20 : 296 



1885. 



In general appearance resembling the narrower leaved forms 

 of Acerates viridiflora. Stems angled when dry, somewhat swollen 

 at the nodes, puberulent ; internodes 1.5-2.5 cm. long or more; 

 leaves broadly lanceolate, 3.5-7 cm. long, 15 mm. wide or more, 

 acute at each end, coriaceous, tomentulose, with a distinct marginal 

 vein ; umbels apparently many, lateral, sessile, globose, many- 

 flowered ; pedicels I-1.5 cm. long, filiform, tomentulose; corolla- 

 segments 5 mm. long, lanceolate, acute ; anther-mass 4 mm. high; 

 hoods erect, attached over the whole short column, shorter than 

 the anthers, 2- parted for nearly half their height, the segment 

 tapering but obtuse, the ventral margins infolded towards the bas- 

 and entire except for a minute notch at the attachment; anther- 

 wings salient above the middle, the angle entire, rounded and 

 tapering towards the base; follicles not seen. 



Collected only once by H. H. Rusby, in Arizona, probably in 

 Yavapai County in 1883. A single specimen is preserved in 

 Herb. Gray. 



5. Acerates auriculata Engelm. Bot. Mex. Bound. Surv. 160. 



1859. 

 Asclepias auriculata Holzinger, Bot. Gaz. 17 : 1 25 and 160. 

 1892. In part. 



Glabrous and glaucous from a branched ? rootstock. Stems 

 2-8 dm. high, mostly solitary, sinuous above when old and rarely 

 branched; leaves alternate-scattered, numerous and sometimes 

 crowded, narrowly linear or filiform-linear, 5-14 cm. long, the 

 scabrous margins not always revolute, becoming thick, coriaceous 



