258 ANNALS OF THE MISSOURI BOTANICAL GARDEN 



b. Stipes, if evident, not over 2 mm. long; leaves usu- 

 ally lobed; pedicels persistent STANLEYELLA 



B. Sepals erect or connivent, except in a few species; glab- 

 rous to conspicuously pubescent, annual, biennial or 

 perennial herbs; blade of petals entire or toothed; 

 stigma entire or 2-lobed; pedicels various; pods erect, 



divaricate or rellexed. 



a. Pods frequently stipitate; biennial or perennial 



herbs; petals flat, entire or toothed; pedicels never 

 strongly recurved; stigmas entire. 



I. Petals entire, purple, white, or blue; septum 

 differentiated in the middle; leaves, except in 



one species and its varieties, entire THELYPODIUM 



II. Petals toothed, white or greenish white; sep- 

 tum nearly uniform; leaves petioled and ir- 

 regularly margined CIILOROCRAMBE 



b. Pods sessile or subsessile on a very broad stipe; an- 



nual or perennial herbs; petals entire, flat, or chan- 

 neled and then usually crisped and narrow; pedicels 

 various, frequently recurved; stigmas entire or 2- 

 lobed. 



1. Valves of the pod separating from the replum 

 at maturity, rarely strongly flattened; stigmas 



entire or 2-lobed; pedicels various CAULANTHUS 



II. Valves of the pod produced into a beak at the 



apex and at maturity separating from the rep- 

 lum only at the base, strongly flattened; stig- 

 mas entire; pedicels recurved STREPTANTHELLA 



Taxonomy 

 taxonomic history of the several genera 



Thelypodium and Stanleyella. — The first species of Thely- 

 podium to be described was T. laciniatum. W. J. Hooker studied 

 this plant from material collected by Douglas and referred it 



Macropodiu 



d Gray recognized 



from that genus and published 



Pachypodium from Nuttall's manuscript. Besides laciniatum 

 there were now referred to Pachypodium two other species, in- 

 tegrifolium and sagittatum. The choice of the name Pachy- 

 podium was an unfortunate one because of the previously pub- 

 lished genus of the same name by Lindley (1830) in the Apocyna- 

 ceae as well as the Pachypodium of Webb and Berthelot (183G- 

 1840). This latter genus was based on a cruciferous plant now 

 generally assigned to Sisymbrium (S. erysimioides Desf.). In 

 1839 Endlicher proposed the name Thelypodium to replace the 

 untenable Pachypodium of Nuttall. This first publication gives 

 only a description with a reference to the genus proposed by 

 Nuttall which Thelypodium. was to replace. In Walpers' 'Reper- 

 torium' (1842) the name Thelypodium was again taken up and 

 to it were assigned three species — T. laciniatum, T. integrijolium, 



