1922] 



PAYSON — STUDY OF THELYPODIUM AND ITS IMMEDIATE ALLIES 245 



SUMMARY OF CONCLUSIONS ON THELYPODIUM 



1. A long stipe or gynophore that raises the ovary or pod above 

 the torus is believed to be a primitive character. 



2. Similarly, a long, terete pod is considered more primitive 

 than a short or compressed one. 



3. The cellular pattern of the septum is thought to be very 

 important as a generic character but is found to show few speci- 

 fic differences. 



4. The ancestral species of this genus are supposed to have 

 had broadly linear or long-spatulate petals that were probably 

 reddish in color. 



5. The dense, racemose inflorescence is held to be primitive 

 and from it have probably been derived the lax, racemose, and the 

 corymbose types. 



6. The pedicels are thought to have been horizontal in the 

 primitive species. They were also, perhaps, rather stout. 



7. The leaves of the ancestral species were probably entire 

 and amplexicaul. 



8. Trichomes are not present in the more primitive species of 

 the genus, and their appearance is held to be a sign of special- 

 ization. 



9. The biennial habit of growth is more primitive than the 

 perennial, but it was probably derived from the annual at no 

 very remote period. 



10. This genus is believed to have originated in eastern Oregon 

 or not far from there. 



11. Thelypodium probably arose from Stanley a or some Stan- 

 leya-like species. 



12. Those species formerly included in Thelypodium but re- 

 cently segregated under the name Thelypodiopsis are not refer- 

 able to Thelypodium. 



13. The segregate genus Pleurophragma is not considered 

 worthy of generic rank and its species are referred to Thelypod- 



ium. 



CIILOROOBAMBE 



The genus Chlorocrambe is maintained by the present writer 

 chiefly because of the doubtful phylogenetic position that may 

 be assigned to its single species. When first discovered this 

 plant was placed in Caiilanthus by Dr. Watson without question 

 as to the propriety of such a disposition of it. Dr. Rydberg, 

 when he raised C. hastata to generic rank, named three charac- 



