OP ARTS AND SCIENCES. 199 



*^* Mexican Species. Remarkably few are known, and these 

 have nearly all been mentioned in the foregoing enumeration. 



S. SCABRIDA, DC, is hardly other than an extreme form of S. Can- 

 adensis, var. scahra. 



S. VELuriNA, UC, seems to be a distinct species of the same group, 

 and has recently been collected by Dr. Palmer in the north of 

 Mexico. The variety from '* Real del Monte, H^enke," is to be 

 excluded, being aS*. Californica from Monterey, California. 



S. GONOCLADA, DC, is a peculiar species not to be confounded with 

 S. odora (a form of which, named S. gonoclada by Schultz, occurs 

 in Mexico), which is also S. piincticulata, DC ; but that was from 

 Texas, not Mexico. 



S. PANICULATA, DC, is the same as S. gonoclada. But the aS^. Mexi- 

 cana, HBK., doubtfully referred to it, is truly the S. Mexicana, L., 

 viz. S.'Sempervirens, L. To it belongs no. 124 of my distribution 

 of plants of Ghiesbreght from Chiapas. 



S. SIMPLEX, HBK., is a peculiar species, of the S. Virgaurea group, 

 which Dr. Schaffner has apparently rediscovered in his S. Pseudo- 

 Virgaurea, ined. 



S. SPATUULATA, DC, of the Same group, proves to be Californiau. 

 See p. 189. 



II. Novitice Arizonicce, etc. : Characters of the Neiv Plants of 

 certain Recent Collections^ mainly in Arizona and adjacent 

 Districts, ^c. 



The principal PolypetalcE, as well as the Apefalce, &c., of the recent 

 collections in our hands will soon be published by Mr. Watson. 



Braya Oregonensis. Humillima, fere glabra ; caulibus foliosis 

 subpollicarsibus e caudice multicipiti caespitosis ; foliis confertis S{)ath- 

 ulato-linearibus integerrimis ciliolatis coriaceis glaucescentibus ; raceme 

 intra folia sessili vel in pedunculo scapiformi parum exserto pauci- 

 floro ; silicula ovata sectione subtereti acuta stylo gracili persistente 

 superata 1-2-sperma (ovulis in loculis binis pendulis), valvis rigido- 

 coriaceis, septo pertenui. — Union Co. Oregon, on sterile subalpine 

 ridges, coll. June, 1880, in fruit, May, 1881, in flower, W. C. Cusick. 

 This peculiar little Cruciferous plant I had named Cusichia, and the 

 discoverer has partially distributed it under this name. But I perceive 

 that it should be referred to the somewhat polymorphous genus Braya 



