_of Arachis and Voandzeia. 161 
Sixteen species of this genus have been lately characterized, and the new 
ones described, by Dr. Vogel (Linnea, 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 bracteolæ, sometimes only the perfect flower with two, three, 
or four bracteole. 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 Voandzeia remains confined to the single V. subterranea, Dup. 
Th: 7 
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 Æschynomene 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. 
Cuapmannia. Torr. et Gray. 
Flores polygami. Floris hermaphroditi sepissime sterilis; calyx tubo filiformi, 
limbo breviter 5-fido, lacinia infima parum majore. Corolla fauci calycis 
inserta. Vexillum suborbiculare. Ale obovate, carina breviores. Carina 
incurva, apice bifida, vexillo subzequilonga. Stamina monadelpha, alterna 
longiora. Antheræ consimiles oblongæ. Ovarium subsessile, glabrum, 
2—3-ovulatum. Stylus filiformis, glaber, obtusus, longe exsertus. Stigma 
minutum (v. capitatum ?). Floris feminei fertilis; calyx, corolla, et sta- 
mina nulla. Ovarium subsessile, erectum, hirsutum, 2—3-ovulatum. 
