54 Pulse (Legumin'osa). [No. 7 



Leaf resembling Fig. 25. — Downy Milk-Pea. G. pilbsa, Ell. 



This species differs from the preceding chiefly in these 

 items : 



Flowers, in many-blossomed clusters that are usually 

 longer than the leaves, sometimes four to six times as 

 long. 



Leaflets, half to one inch in length, oval, whitish-downy 

 beneath. 



Pods, very downy. Seeds, ten. 



Found, from Pennsylvania southward. 



(7) Genus Apios, Boer. 



From a Greek word meaning " pear," with reference to the shape of the tubers. 



Fig. 26. — Ground-Nut. Wild Bean. A. tuberbsa, Moench. 



Flowers, brownish-purple, fragrant, in short, compact, and 

 often branching axillary clusters that are shorter than 

 the leaves. Standard, very broad, and turned back. 

 Keel, scythe-shape, becoming coiled. Calyx, bell- 

 shape, slightly two-lipped, the two upper teeth 

 rounded and very short, the two at the sides nearly 

 obsolete, the lower one longest and pointed. Sta- 

 mens, in two sets (nine united toward the base, and 

 one distinct). July and August. 



Leaflets, three to seven (usually seven, rarely three), 

 narrow, egg-shape, more or less pointed, smooth, 

 with short stem. Stipels, lacking. 



Pod, slender, nearly cylindrical, straight or slightly curved. 

 Seeds, many, black. A legume. 



Found, in damp ground, from New Brunswick to Florida 

 and westward. 



