430 Rydberg : Rocky Mountain flora 



Dr. Greene evidently intended to include in Guillenia, Arabis 

 lo'igirostris or StreptantJms longirostris, but in enumerating the 

 species of his new genus he has no G. longirostris. He has one 

 G. rostrata based on Arabis rostraia S. Wats., a name the publi- 

 cation of which I have been unable to find. Arabis longirostris is 

 hardly congeneric with Tclypodiuui lasiophylluui, however. It has 

 the flat pod oi Strcptanthns, 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 Pachyfyodiiun in Torrey and Gray's 

 Flora, now usually known as Thclypodinin intcgrifoliuni (Nutt) 

 Endl., 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 ahme 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 T. intcgrifoliuni in habit, foliage 

 and flowers, is T. linearifolinni or lodanthus or Strcptanthus lincari- 

 foliiis, but it lacks the rib on the septum. Besides it has two 

 characters not found in the other Thelypodia. 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 Hcsperis, 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 Eiithelypodiuni in the Synoptical 

 Flora, Dr. Robinson gives 7". clegans 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 T. aiireuni Eastw. and T. Bakeri Greene. Mr. 

 George Osterhout, of New Windsor, Colorado, who has collected 

 a specimen of T. eligans, has written on the label : " near to 



