o/Arachis and Voandzeia. /fir;:an.v 161 



Sixteen species of this genus have been lately characterized, and the new 

 ones described, by Dr. Vogel (Linncea, v. xii. p. 63). He divides the genus into 

 two sections according to the presence and absence of the stipiform rudiment 

 of a flower in the same axilla as the perfect one. This character appears 

 constant in most instances, although in S. viscosa, Sw. (of which S. glutinosa 

 and «S'. humilis of Kunth are probably mere varieties) I have observed some- 

 times two perfect flowers, sometimes a perfect one and a small stipiform rudi- 

 ment with four bracteolae, sometimes only the perfect flower with two, three, 

 or four bracteolae. Amongst the very few new species I should have to add 

 to those of Vogel, there is nothing remarkable enough to make it worth while 

 describing them on this occasion. 



The genus F'oandzeia remains confined to the single V. suhterranea, Dup. 

 Th. 



Since the above has been in the press, I have received the second part of 

 Torrey and Gray's Flora of North America, in which is described a curious 

 new genus under the name of Chapmannia, closely allied to Stylosanthes in 

 structure, but with the habit of some species of JEschynomene and Adesmia. 

 As I am indebted to the kindness of the authors for specimens containing 

 flowers in both states, I subjoin a full character drawn up in conformity with 

 those I have above given of Arachis and Stylosanthes, adding a description of 

 the fruit from a letter recently addressed by Dr. Torrey to Dr. Gray. 



Chapmannia. Torr. et Gray. 



Flores polygami. Floris hermaphroditi scepissime sterilis ; calyx tubo filiformi, 

 limbo breviter 5-fido, lacinia infima parum majore. Corolla fauci calycis 

 inserta. f^eccillum suborbiculare. Alee obovatse, carina breviores. Carina 

 incurva, apice bifida, vexillo subsequilonga. Stamina monadelpha, alterna 

 longiora. Antherce consimiles oblongse. Ovarium subsessile, glabrum, 

 2 — 3-ovulatum. Stylus filiformis, glaber, obtusus, longe exsertus. Stigma 

 minutum (v. capitatum?). Floris foeminei fertilis ; calyx, corolla, et sta- 

 mina nulla. Ovarium subsessile, erectum, hirsutum, 2 — 3-ovulatum. 



