92 PLANTS WITH TWO KINDS OF SEEDS. [CHAP. 



Durieu) which produces two kinds of seed (Fig. 56), 

 one somewhat flattened, short and broad, with rounded 

 angles ; the other elongated, hooked, and shaped like 

 a shepherd's crook with a thickened staff. In this case 

 the hook in the latter form perhaps serves for dispersion. 

 Our common Thrincia hirta (Fig. 48$) also pos- 

 sesses, besides the fruits with the well-known feathery 

 crown, others which are destitute of such a provision, 

 and which probably therefore are intended to take 

 root at home. 



FIG. 56. Seeds oiCorydalis heterocarpa. 



Mr. Drummond, in the volume of Hookers Journal 

 of Botany for 1842, has described a species of ( 

 Alismacea which has two sorts of seed-vessels* the' 

 one produced from large floating flowers, the other at 

 the end of short submerged stalks. He does not, 

 however, describe either the seeds or seed-vessels in 

 detail. 



Before concluding I will say a few words as to the 

 very curious forms presented by certain seeds and 



