1- 



? 



r 



L 

 I 



i 

 I 



IK 



WEvSTKRN SPECIES OF ARABIS- 69 



Some Western Species of Arabis. 



Ever^^ year of the last fifteen, by the arrival at my study 

 table of several specimens of Aradis from the farther West, I 

 have felt the desirability of a general summing up of the mem- 

 bership of this group of crucifers, in the form of a mono- 

 graph ; but the time for undertaking such a task still recedes. 

 Meanwhile a new invoice of these plants having lately come 

 in to me from northern California under promise on my part 

 that I would try to identify and report on them, I have been 

 impelled to make a renewed study of other material of this 

 kind lying in the National Herbarium hitherto unexamined. 



For my own convenience and that of others I shall first 

 present a short bibliography of my ow^n contributions to the 

 knowledge of the genus made within the last ten or a dozen 

 years. 



A. rhodantha. Fendleri, Pitt, iii, 155. A. drepanoloba, 

 1. c. 306. A. Albertina, arida, campyloloba, connexa, consan- 

 guinea, duriuscula, eremophila, formosa, gracilenta, gra- 

 cilipes, maxima, oxylobula, oxyphylla, platyloba, recondita, 

 rectissima, tenuis, Pitt, iv. 189-198. 



A. Austinae, Covillei, epilobioides, inamoena, Leibergii, 

 Missouriensis, oligantha, peramoena, pratincola, trichopoda, 

 Feddes* Repertorium, v. 242-244. 



Out of a considerable number of new species here charac- 

 terized, only the first is at all closely akin to true Arabis, the 

 best representative of which in the farther West is A. Ble- 

 pharophylla of the coast of California. That and its allies are 

 marked by a truly green herbage which is of thin texture, with 

 no other than a sparse and bristly pubescence. The petals of 

 these, though purple in color, have a broad spreading limb, 

 and the pods are always straight and erect. 



Arabis aculeolata. More or less tufted montane peren- 

 nial, with subscapiform slender few-flowered stems 6 to 10 



ft: 



Leaflets, Vol. II, pp. 69-88^ 11 May, 1910. 



-\" 



