[Vol. 9 



260 ANNALS OF THE MISSOURI BOTANICAL GARDEN 



in Thelypodium the most extended account of Caulanthus prev- 

 iously published was by Dr. Robinson in the 'Synoptical Flora.' 

 In this work nine species were recognized. In the present treat- 

 ment the author has found it necessary to transfer to Caulanthus 

 several species carried for many years in other genera as well 

 as to describe a few new species. Accordingly the number of 

 species has been increased and the limits of intrageneric diversity 

 greatly extended. 



The only segregation of Caulanthus in its former limited sense 

 that has ever been attempted was the removal by Dr. Rydberg in 

 1907 of C. hastatus as the type of the monotypic genus Chloro- 

 crambc. 



Streptanthella. — Dr. Rydberg in 1917 proposed this monotypic 



genus to contain a species of uncertain affinities. This plant was 



first described by Watson as Arabis longirostris in 1871 but in 



1889 was transferred by the same author to Streptanthus and has 



been generally treated in that genus up to the present time. In 



1906 Greene included this species in his genus Guillenia as G. 

 rostrata. 



Warea. — The similarity of species of this genus to certain cap- 

 paridaceous plants was recognized by Muhlenberg who in 1813 

 proposed the name (without description) Cleome cuneifolia for 

 the plant now known as Warea cuneifolia. However, it was soon 

 recognized that its affinities were with the Cruciferae rather than 

 with the C apparidaceae . DeCandolle in 1821 independently 

 described cuneifolia as Sta?ileya gracilis and Nuttall in 1822 pub- 

 lished atnplexi folia as a Stanley a. It was in 1834 that Nuttall re- 

 considered this disposition of these plants and erected the genus 

 Warea, named in honor of Nathaniel A. Ware, to receive them. 

 Nuttall recognized but two species although it seems evident that 

 he had three at hand, and that he based the genus primarily 

 upon his earlier Stanley a amplexif olia. Since that time the 

 validity of the genus has not been questioned and but two species 

 have been added to it. 



THELYPODIUM 



Thelypodium Endl. Gen 



Wats 



870. 18159 ; Walp. Rep. 1 : 172. 18 -12 ; 



1871, in part; Brewer & Wats. Geol. 

 Survey Calif. Bot. 1: 37. 1876, in part; Prantl in Engler & Prantl, 

 Nat. Pflanzenfam. III. Abt. 2: 155. 1891; Robinson in Gray, 

 Syn. Fl. N. Am. I 1 : 173. 1895, in part; Nelson in Coulter & 



