J 44 Plants Collected in Paraguay. 



The gentleman on whose farm these trees grow told me that his 

 cattle w^ere extravagantly fond of the leaves and young branches, 

 and made desperate efforts to pull them down. 



Pterocaulon angustifoliiim, D.C., 1. c, 454. 



Luque (314). December. = Balansa 834 a. 



According to Benth. and Hook. Gen. PI., only 13 species of Ptei'o- 

 caulon are known, t of which are Australian and the other 6 inhabi- 

 tants of North and South America. Four of these are included in 

 this list of Paraguay plants. The most interesting of them, per- 

 haps, is no. 192, P. virgatum, D.C. This grows on the open campo 

 both in Central Paraguay and on the Pilcomayo. The heads are 

 in long, narrow, terminal spikes 10-25 cm. long, or in interrupted 

 verticils, on long, nearly naked peduncles. Leaves few, linear, 

 5-10 cm. in length, dark green on the upper surface, revolute and 

 white woolly beneath, decurrent in long green wings upon the stem. 

 Between the wings, the stem is white wooll}^ like the under surface 

 of the leaves. 



By the side of this on the campo are two other species, P. capi- 

 tatum (no. 958 b) and P. alopecuroideum (no. 958 a), the latter 

 with elliptical leaves about 2|- cm. long, and densely white woolly 

 below, the heads in short, compact, terminal spikes. All the species 

 are very peculiar in appearance, and at once attract attention by 

 their forlorn, starved looks among the luxuriant growths of South 

 America. 



Pterocaulon capitatum (H. and A.), Britton. 

 Pluchea capitata, H. and A. 



Pilcomayo River (958b). March. = Balansa 838. 



Pterocaulon Tirgatum (L.), D.C, 1. c, 454. 

 Pilcomayo River (958); Asuncion (192). 



Pterocaulon alopecuroideum (Sw.), D.C, 1. c. 

 Pilcomayo River (958a). March. 



Acliyrocline satureoides (Lam.), D.C, Prod., vi, 220. 



Gran Chaco near Asuncion (354). December. 



While resembling Gnaphalium in general appearance, this genus 

 is distinguished by its small heads, containing 5-8 flowers, and with 

 8-12 involucral scales, which close tightly over the flowers. The 



