STREPTANTHOID GENERA. 227 
Stein’s Mountain, Oregon, W. C. 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 by me. ‘The following seem to need 
mention. 
S. 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 Huclisia, 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 Arabis 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 
Arabis 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 flowersare 
in Arabis 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 
GUILLENIA. The more typical species are 
G. LASIOPHYLLA. Hook. & Arn. under Turritis. 
