1922] 



PAYSON — STUDY OF THELYPODIUM AND ITS IMMEDIATE ALLIES 259 



and T. sagittatum. At this time, then, the name Thelypodium 

 was definitely established to replace the unfortunate name of 

 Pachypodium as used by Nuttall. The genus was, of course, con- 

 sidered distinct from Macropodium. 



From 1842 until 1907 the number of species assigned to Thely- 

 podium gradually increased. In 1852 Dr. Gray added the first 

 anomalous element as T. Wrightii — now Stanley ella Wrightii. 

 After this, Thelypodium became a receptacle for many plants 

 which, on account of their entire stigmas, were not admitted to 

 Sisymbrium. Dr. Watson transferred a number of species to 

 Thelypodium which had originally been described as species of 

 Streptanthus or Sisymbrium. In 1895 there appeared in the 

 'Synoptical Flora' an excellent treatment of Thelypodium in the 

 larger sense by Dr. Robinson. In this treatment the diversity 

 of the species retained is recognized and sections are proposed to 

 contain the more different groups. 



The first attempt at segregation was made in 1907 when Dr. 

 Rydberg separated from this Thelypodium complex the new gen- 

 era Thelypodiopsis, Pleurophragma, Hesperidanthus, Stanleyella, 

 and Heterothrix. In the present study Pleurophragma is again 

 united to Thelypodium, and Stanleyella is recognized as a dis- 

 tinct genus. No disposition of the other segregates is made at 

 the present time except that they are not to be retained in 



Thelypodium. 



Caulanthus and Chlorocrambe. — Watson in 1871 proposed the 

 genus Caulanthus to include five species of Cruciferae from west- 

 ern North America. Of these five, two were described as new 

 and three were transferred from Streptanthus. The first species 

 mentioned and the one on which the genus was evidently founded 



is C. crassicaulis 



). This species not 



more closely with the generic description than do 



but in a note following the specific descript 

 on of the new generic name is given: "kno\ 



Wild 



Cabbage', and sometimes used as a tolerable substitute for the 

 cultivated plant. This fancied affinity to the Cauliflower-tribe of 

 more favored regions has suggested the generic name." This 

 species then would, without doubt, become the generic type if 

 the group were segregated. Only one species of the five included 

 in the original treatment of the genus is not now considered con- 

 generic with the others, C. hastatus. Following the publication 

 of Caulanthus a few species were added from time to time and 

 the validity of the genus was almost universally accepted. As 



