REVISION OF THE NATURAL ORDER BIGNONIACEJE. 81 
we may assume that regions at present so inhospitable possessed at the 
Miocene period a milder climate, a mean temperature of at least 8? to 9° 
Réaumur, in order to favour a vegetation such as is found in our days 
only in the central and southern parts of North America and Europe, the 
floras of which, especially that of North America, agree in their general 
features best with that of the Miocene period. 
REVISION OF THE NATURAL ORDER BIGNONIAC EA, 
By Bertuotp Seemann, Pu.D., F.L.S. 
SrzNoLoBIUM, D. Don. 
This genus was founded by D. Don in 1823, some years prior to 
Mr. Bentham's Papilionaceous genus of the same name.: As the type of 
D. Don’s Stenolcbium, I regard the simple-leaved form of Tecoma stans, 
which De Candolle has described as Tecoma Gaudichaudi, and D. Don 
as Stenolobium castaneefolium.  Stenolobinm is easily distinguished 
from allied genera by its regular 5-ribbed and 5-toothed calyx, infundi- 
buliform corolla, included genitals, divaricate anthers, and siliquose, 
flat capsule, with a septum bearing only one row of seeds on each side. 
The anthers are villose or quite glabrous, and offer good specific cha- 
racters, but I do not regard them of generic value, and. think that the 
independence of Craterotecoma and Lundia, both of which are retained 
principally on account of their villose anthers, is very much shaken by 
the observation, that in a truly natural genus with a distinct habit, as 
Stenolobium, D. Don, undoubtedly is, some species have villose, others 
glabrous anthers. I have never seen a specimen of Craterotecoma, 
but judging from a brief description, that genus is either identical with 
or very near to S/enolobium. 
STENOLOBIUM, D. Don.—Char. Gen. 
5-dentatus. Corolla infundibuliformis, 5-lobus, lobis subregularibus, ro- 
tundatis. Genifalia inclusa. Stamina 4,didynama, cum rudimento quinti. 
Anthere discrete, glabre v. villose. Capsula linearis, compressa, 
Siliquzeformis, bivalvis, septo valvis contrario. Stigma bilamellatum. 
Semina alata, 1-seriata.—Frutices stantes Americe tropic, frazini- 
folii, foliis imparipinnatis, vel unifoliolatis, foliolis serratis vel incisis ; 
floribus terminalibus, racemosis vel paniculatis, favis. Species tria :— 
Calyx regularis, 5-costatus, 
