barnhart: genera in lentibulariaceae 47 



Four marked corolla-types may serve to distinguish as many 

 subgenera, or perhaps genera. Of these, the most distinct is 

 Temnoceras. 



A. IsoLOBA (Raf. pro gen.)- Corollae lobi subaequales et 

 subaequaliter divergentes; calcar abrupte contractum et cum 

 tubo angulum validum formans. 



B. PiONOPHYLLUM A. DC. Corollae limbus obliquus; lobi 2 

 superiores erectiores et plus minus coaliti, 3 inferiores explanati 

 et plus minus coaliti; tubus in calcar gradatim transiens. 



C. Orcheosanthus a. DC. Corolla profunde 5-partita itaque 

 tubo subnullo; calcar pendens, lineare. 



D. Temnoceras (subgen. nov.). Corolla profunde bilabiata; 

 labium superius bidentatum, inferius divergente trilobatum; calcar 

 subcylindricum. 



Isoloba comprises 4 species in the southeastern United States, 

 and about 6 in tropical America; there is only one in the Old World, 

 the little-known P. liisitanica L. The subgenus Brandonia differs 

 only by its yellow corollas, and seems unworthy of taxonomic 

 recognition. Some of the species of Isoloba have a prominent 

 acicular or even clavate palate, included in the throat, but in other 

 species the palate is much less distinct, while in some it is essen- 

 tially obsolete. 



Pionophyllum comprises about 15 species, mostly European, 

 some of them ranging to the mountains of central Asia and northern 

 Africa, or to the northern parts of North America; while a few 

 are found in tropical America, and one as far south as Patagonia. 



Orcheosanthus includes about 6 species, apparently, but future 

 study may show that the number is less, or that the fragmentary 

 material now preserved in herbaria represents a much larger 

 number. The range of variation is enormous, but how much is 

 seasonal, how much individual, and how much of taxonomic 

 importance, is at present mere guesswork. The group is wholly 

 confined to Mexico. 



Temnoceras is based upon a single described species, a small 

 one of Mexico and Central America, Pinguiciila crenatiloba. 

 Probably it will eventually be segregated into several species, but 

 the material now available is insufficient to accomplish this in a 

 satisfactory manner. The corolla-sinus is so deep that it extends 

 beyond the corolla-base and the lower lip is connected with the 

 upper one only by the spur; hence the name, which signifies 

 cleft spur. 



