﻿Vail : Studies in the Asclepiadaceae 181 



over the anthers : anther-wings slender, angled and salient at the 

 base, apparently entire: follicles very slender, 4-4.5 cm. long, 

 glabrous, tapering at each end : seeds 4 mm. long, very thin : 

 coma 1.5 cm. long. 



A species easy to distinguish from its allies by the hoods, which 

 exceed the anthers, a character which never occurs in any of the 

 species enumerated above as being related to A. verticillata. 



Arizona : Santa Catalina Mts., Lemmon, 1 88 1 , and "by streams 

 of Santa Catalina Mts.," Pringle, 1881 ; Huachuca Mts., Lemmon, 

 1882; Fort Huachuca, T. E. Wilcox, 1892. Mexico: San Luis 

 Potosi, Schaffner, no. 58, in Herb. Canby ; State of Nuevo Leon, 

 Pringle, no. 1895 in Herb. Columbia University. 



A small specimen said to have grown "in Mr. Hogg's garden 

 1825, raised from seeds collected by Dr. James in Long's Expedi- 

 tion to the Rocky Mountains " is preserved in Herb. Torrey. It 

 appears to belong here, but the flowers are in too poor a condi- 

 tion to make it certain. The sheet on which it is pasted bears a 

 note by Dr. Gray to the effect that "it most likely equals A. vir- 

 gata Lagasca, but has the horn too long." 



A specimen from San Luis Potosi, collected by Parry and 

 Palmer, no. 581, might also be referred to this species and in 

 fact it is partly so labelled, but it is much more branching in habit 

 and has somewhat shorter leaves. 



Asclcpias linifolia is referred to Asclcpias angustifolia Schweiger, 

 Enum. Hort. Bot. Regiomont, 13. 18 12 by Hemsley, but Four- 

 nier (Ann. Sci. Nat. VI. 14: 376. 1882) notes that it would 

 be difficult to determine whether it belongs to A. linifolia or to A. 

 virgata Lag. (1804). I have seen no authentic specimens of the 

 latter species. It is said to have " Corollae albae, colore roseo- 

 livido suffusae." 



The plant in Loddiges' Catalogue was made from a specimen 

 raised from seed, habitat unknown, but it seems to be our plant 

 except for the somewhat broader leaves, and is the same as and 

 probably the origin of many garden specimens. 



Should all of these names fail to belong here I have added 

 to them the name which appears on a plant collected by Lem- 

 mon in Herb. Gray, Prof. Greene having long ago recognized it 

 as a good species. 



