430 RyDBERG: Rocky MOUNTAIN FLORA 
Dr. Greene evidently intended to include in Guz//enia, Arabis 
longirostris or Streptanthus longirostris, but in enumerating the 
species of his new genus he has no G. /ongirostris. He has one 
G. rostrata based on Aradis rostrata S. Wats., a name the publi- 
cation of which I have been unable to find. Aradis longirostris is 
hardly congeneric with Telypodium lasiophyllum, however. It has 
the flat pod of Streptanthus, but the short anthers, merely cordate 
at the base, and not spirally curved, place it as very doubtfully 
belonging to any of the Streptanthoid genera. 
The second species of Pachypodium in Torrey and Gray’s 
Flora, now usually known as Thelypodium integrifolium (Nutt) 
_End1., is so different in habit, that the writer has always found it 
hard to regard it as congeneric with the rest, but the differences 
in the structure of the flower and of the pod externally are so 
slight that a segregation based on habit alone would not be desir- 
able. There is however, a character in the pod, unique to this 
species and two or three segregates from it and making them 
stand isolated from all the other Thelypodioid plants, viz., the 
strong and broad midrib of the septum of the pod. There is no 
distinct midvein in any of the typical Thelypodia. 
A species closely resembling 7. integrifolium in habit, foliage 
and flowers, is 7. Linearifolium or Todanthus or Streptanthus lineari- 
folius, but it lacks the rib on the septum. Besides it has two 
characters not found in the other 7%) helypodia. Two of the rather 
firm and purple sepals are strongly saccate at the base and the 
stigma is conical, not truncate nor 2-lobed as in the other species. 
It could be referred to Hesperis, which it resembles especially in 
the flowers, if it were not for the stipitate, terete pod and the 
curved anthers, which characters are strongly thelypodioid. 
In describing the subgenus Euthelypodium in the Synoptical 
Flora, Dr. Robinson gives 7. elegans Jones as an exception hav- 
ing a 2-lobed stigma with the lobes expanding over the septum. In 
the whole tribe the stigma is either undivided or else the lobes are 
expanded over the valves. This exceptional character is most 
pronounced in the species mentioned above, but it is also found in 
less degree in 7. aureum Fastw. and 7. Bakeri Greene. Mr. 
‘George Osterhout, of New Windsor, Colorado, who has collected 
a specimen of 7. elegans, has written on the label: ‘near to 
