404 BOTANICAL GAZETTE [NOVEMBER 
In all three species, at the opposite side of the hilum from the 
micropyle, the raphe ends with a more or less prominent elevation. 
In beans and teparies this elevation is completely divided into two 
lobes by a crease beginning at the hilum and passing between them. 
In the limas, on the other hand, the crease enters the elevation 
but does not pass entirely through it. The raphe of the lima there- 
fore ends in a V-shaped, two-pronged elevation rather than in two 
rounded, completely separated elevations as in the other two species 
(fig. 5). The character generally used in botanical keys to dis- 
tinguish between the lima and kidney bean is the presence of vas- - 
cular lines radiating from the hilum. These are distinctly visible 
in the former, but lacking in the latter 
species. This character is very variable in 
the tepary, being prominent in some varie- 
ties and entirely wanting in others, with 
every degree of variation between these 
extremes. 
Since the tepary does not belong to 
either of the species which include the 
varieties of the kidney and lima beans, the 
Fie eis sis question arises whether it has hee 
of lima bean (a), bean (), Deen recognized among the domesticat 
beans. 
In the monographs of JARVIS’ and © 
Tris’ on the garden beans, five genera are recognized: Phaseolus 
(kidney bean), Vicia (broad, English, or Windsor beans), Vigne 
(cowpea), Dolichos (asparagus bean), and Glycine (soy, soja, OF 
coffee bean). To these Tracy? adds macunna (velvet bean). 
The economic species of Phaseolus, according to each of these 
writers, are three:! P. vulgaris (kidney bean), P. Junatus (lima 
* Jarvis, C. D., American varieties of beans. Cornell Bull. 260. pp. 149-245- 1908. 
Trisu. H. C., Garden beans cultivated as esculents. Missouri Bot. Gard. Ann. 
5. 1909. 

and tepary (c) 
2 
Rept. 12. pp. 81-16s, ‘ 
3 Tracy, W. W., Jr., American varieties of garden beans. U.S. Dept. Agric., 
Bur. Pl. Ind. Bull. 109. PP. 5-173. 1907 
‘The seven species of common bean (P. vulgaris Savi, P. compressus Martens, 
P. gonospermus Savi, P. carinatus Martens, P. oblongus Savi, P. ellipticus Martens, 
and P. sphaericus Martens), whi i 
Gardenbohnen. 1860) according to the shape and size of the seed, are now recogniz' 
as varieties of P. vulgaris L. 

