or THE PERUVIAN ANDES. 29 



CjauciFEE-a:. 



SisTMBRiFM MTBiopnTLLUM, H. B. K. Valley of the Eimac, 

 ascending from about tlie level of 9000 feet to Chicla ! 



SiSTMBRiUM TiTiOACENSE, Wolp. Bel, Meyeu, in Nov. Act. 

 Acad, Lcop,-Carol, xis., Suppl. 1, p. 249. Above Casapalta, 

 about 14,300 feet ! The steins are 1-1 i foot long, prostrate or 

 suberect, branching from below. The length of tlie siliqua seems 



F 



to be variable in this group, and I doubt whether /S'. athrocarpiwt, 

 A.. Grray, U. S. Expl. Exped. i. 59, tab. 3, can be maintained as a 



distinct species. 



SiSTMBEiuM HiKSiJTUMj FlancTi, et Triana^ DO. (siil Turrite). 



Chicla ! Upper Eimac valley, about 10,000 feet ! 



Dbaba siliquosa, SooJc.Jil. Chicla ! Above Casapalta! 



Capsella Buesa-pastobis, Z)(7. In many places about Chicla ! 

 This is one of the S2:)ecies that seem to owe their wide-spread dif- 

 fusion in most regions of the earth to the agency of animals, and 

 at the same time to their capability of adaptation to very different 



physical conditions. I have met with it in stations to whicli the 

 seeds must apparently bave been carried by birds; but for its 

 original introduction in some remote regions it may be presumed 

 that the unintentional interference of man is responsible. Such 

 an instance is to be fouiul in the Straits of Magellan, where I 

 found it rather common and still flowering in midwinter about 

 Sandy Point, 



Lepidium VIRGIXIA5UM, Z. Upper valley of the Riinac ! 



Lepidium affi:n'E, Wedd, in A^n. Sc, Nat. ser. 5, i, 284, var. 

 Chicla ! 



Lepidium Hu;m:boldtii, DC. Chicla ! 



CiiEMOLOBUs Pi^'>^ATiriDrs, Hook. Ic. PL 100,= C. parviflorus, 

 Wedd. i7iA7ri. Sc. Nat. ser. 5, i. 283, = C. aphanopterus, ^. Gray, 

 IT. S. Eocpl. Eccpcd. i. 55. Chicla! The breadth of the wing of 

 the silicule in this and the allied species is extremely variable, 

 and without a series of connecting forms the identity of the above- 

 named species might well be doubted. Some of my specimens 

 are exactly A. Gray's C. aphanopterus, while others can scarcely 

 be distinguished from Hooker's type specimens of C. pinnatifidus. 

 I may here point out the necessity for suppressing the name of 



