Atnphicarpcea ni<>>i 275 



be described as falcate; the surface is smooth, 1 ting 



the dorsal and ventral sutures which are h liry. The calyx 

 persists and remains quite conspicuous until dehiscence. 



(Plate XX., Pigs. 4, 5.) The seeds vary in number from two 

 to four; three, however, are generally found. The walls 

 of the legume are firm, resisting and quite thick. 



{/') The legumes of this type are about an inch in length, 

 and are not stipitate, or but very slightly so. They are not 

 tapered, their shape being nearly oblong; the style extends 

 from the apex of each as in (a), and its calyx is smaller than 

 that in (a), but like it persists. The surface is slightly 

 hairy ; the sutures resemble in condition those of 

 Usually there are two seeds, but the number varies from 

 one to three. (Plate XX., Fig. 6.) 



[d) The legumes of this type are still smaller than those 

 of (/;), and are sessile. They are oblong, the style remaining 

 as a hook which often lies close to the suture. The sur- 

 face as well as sutures are noticeably hairy. The seeds num- 

 ber one or two, the latter being most common. (Plate XX., 

 Figs. 7) 8.) 



Histological features will receive attention toward the 

 close of the paper. 



In the aerial types (a, 6, d) the seeds are reniform, varying 

 from one-quarter to three-eighths of an inch in length. 

 When ripe the color is grayish green, flecked with dark 

 purple. Upon exposure to the air they become dark 

 brown, with purple black spots ; quite often the coloring is 

 a uniform purple brown or black. Type (d) bears the 

 largest seeds; (a) and {b) bear seeds of about the same size. 

 In the general aspect of these but little variation is seen. 

 Those of {a) seem darker, but it is doubtful if this distinc- 

 tion will hold. 



The structure of the coats of the aerial seeds will be de- 

 scribed according to the sequence adopted for those of 

 the terrestrial. No histological differences in the three 

 types of aerial seed have been observed. The outer indu- 

 rated layer of cells resembles in shape, arrangement and 



