A CONSIDERATION OF CERTAIN GENERA 20I 



invalid because no species were indicated, although not a few of 

 them have been more or less commonly recognized and used in 

 floras and manuals up to within a few years ago. 



Before passing to a detailed consideration of Ehrhart's genera 

 it may not be out of place to enumerate a few commonly accepted 

 generic names which were published by Rafinesque merely by the 

 citation of a type species. More extended search would doubtless 

 reveal other genera by other authors which 1 elong in the sam.e 

 catagory. ' 



Adlumia Raf. 



Scoria (Hicoria) Raf. 



Spathyema Raf. 



Triadenum Raf. 



Achroanthes Raf. (Malaxis Sw.) 



Washingtohia Raf. (Osmorhiza Raf.) 



Odostemon Raf. 



Quamasia Raf. 



Leptamnium Raf. 



Thalesia Raf. 



Leptilon Raf. 

 The number preceeding each of Ehrhart's names is that of the 

 order in which he published them. 



I.— PhaeocEphalum Ehrh. Beitr. 4: 146. 1789. 

 (Rynchospora Vahl, Enum. 2: 229. 1806) 



The type as indicated by Ehrhart, is Schoenus fuscus L. Schoenus 

 cornicttlatus -ham. not V.eing regarded as congeneric with this 

 group is not included in the following enumeration of species 

 formerly referred to Rynchospora. 



P. album (L) Rynchospora alba (L.) Vahl 



P. axillare (Lam.) " R. axillare (Lam.) BrittQ.'n 



P. Baldwinii (A. Gray) R. Baldwinii A. Gray 



P. brackychaetum (Sauv.) R. brachychaeta Sauv. 



P. caducum (Ell.) R. caduca EU. 



P. chapnianii (M. A. Curtis) R. chapmanii M. A. Curtis 



P. ciliatum (Michx.) R. ciliata (Michx.) Vahl 



P. compressum (Carey) R. compressa Carey 



P. Curtissii (Britton). R. Curtissii Britton 



P. cymosum (Ell.) R. cympsa Ell. 



P. decurrens (Chapm.) R, decurrens Chapm. 



