STKEPTANTHOlb GEN'BHA. 23'?' 



Stein's Mountain, Oregon, W. 0. Cusick, July, 1898, n. 2002 

 as in U. S. Herb. 



In the Streptanthus of Gray's Synoptical Flora several species 

 found place which do not fall naturally into any of the segre- 

 gate genera proposed hy me. The following seem to need 

 mention. 



8. platycarpus, Gray. This is unknown to me except by 

 description. By the character of its broad petal-blades it should 

 belong just where it has hitherto been placed, in Streptanthus, 

 though the pods are small for that genus. 



S. Lemmoni, Wats., is altogether too imperfectly known. From 

 the description of the calyx it can not be an EucUsia. It is 

 also wholly beyond the range of that genus. It might be an 

 Icianthus; but there is no telling. 



S. longirostris, Wats. Since I came to know the living plant 

 in its native deserts I have considered Mr. Watson's first disposal 

 of it under Arabia as less objectionable. At not one point of floral 

 structure is it in contact with Streptanthus or with any one of its 

 segregates ; but there are not wanting points of agreement with 

 Ardbis as now maintained. The sepals are equal, all four alike, 

 loosely somewhat spreading (ascending), enclosing short petals 

 that show no distinction of blade and claw. Quite such flowers are 

 in Arabia here and there ; but in this last named group we have 

 no rostrate siliques. For a recurrence of this carpological char- 

 acter we look to certain other far-western plants which, follow- 

 ing my suggestion of many years ago, have been received into 

 Thelypodium. Habitally also the present type harmonizes with 

 " T. lasiophyllum," and this so perfectly that for years I have 

 been regarding the little annual of interior deserts as a natural 

 descendant of T. lasiophyllum, hence congeneric with it. I now 

 propose the separation of that Californian type already in past 

 history referred to so many different genera, and in commemo- 

 ration of an eighteenth century explorer of California shall 

 name it 



GuiLLBKiA. The more typical species are 



G. LASIOPHTLLA. Hook. & Am. under Turritis. 



