ROSE—MEXICAN AND CENTRAL AMERICAN PLANTS, 35 
KEY TO UNITED STATES SPECIES. 
Stems procumbent; leaflets broad, suborbicular.......2.0..2.2--------- 1. C. lemmoni. 
Stems suberect or twining; leaflets usually narrow, linear to lanceolate. 
Leaflets lanceoldte.. 2.022 cece cece ee en eee eee eee eee eee eee BOO, pallida, 
Leaflets linear, 
Leaflets glabrous above, pods straight, elongated.........--------- 3. CL longifolia, 
Leaflets hairy above; pods faleute. 0.2.0.0. 2 eee eee eee eee 4+. CL confusa. 
From Central America have been reported Cologaunéu pulchella and 
C. procumbens. The former species is to be excluded from that 
region, but I here add C. pallida and C. rufescens, and there are 
probably still others to be found there. 
C. procumbens, C. ovalifolia, and C. austral/s have been described 
from South American specimens. (. procumbens seems to extend 
into southern Mexico; C. oval/fol/a has been credited to Mexico by 
several writers, but is probably to be excluded. 
Only a few species have ever been in cultivation and these usually 
in botanic gardens. Bailey does not include the genus in the Cyclo- 
pedia of American Horticulture, while Nicholson only enumerates 
four in his Dictionary of Gardening. The most ornamental ones, such 
as grandiflora, hirta, capitata, ete., have never been cultivated, 
although they seem worthy of a trial. The species are all perennial, 
growing at considerable elevations, in dry situations and usually in 
the open. 
The following are the species which have been reported in cultiva- 
tion, with the year of their introduction: 
Cologania biloba, 1827. Cologania pulchella, 1837. 
Cologania broussonetii, 1813, 1827. Cologania angustifolia, 1827. 
The following key is intended as merely suggestive and will prob- 
ably require much modification when more material is brought to 
hieht. 
KEY TO THE NORTH AMERICAN SPECIES, 
Leaflets one. 
Corolla 2 em, or more long ....22---+22---22----2-2--- 222 ee eee lL. C. procumbens. 
Corolla less than 2 em. long....-----2-2---- 2-2-2022 eee eee ee eee 2. C. erecta, 
Leaflets, more than one, usually three. 
Leaflets linear to narrowly oblong. 
Leaflets glabrous or nearly so above. 
Pubescence on calyx appressed; pods 3 cm. or less long......--- 3. CL intermedia. 
Pubescence on calyx spreading; pods 5 em, or more long, narrower than the last. 
4. C. longifolia. 
Leaflets pubescent above. 
Leaflets greene... 0.2.2 eee ee ee ee eee eee eee d. C. angustifolia. 
Leaflets very pale. c.20 cece cece eee eee ee ee eee eee eee eee eee 6. C. confusa, 
