168 Trans. Acad. Sci. of St. Louis. 



Endosperm. Aleurone layer consists of nearly isodiametric 

 thick-walled cells. The mucilaginous reserve cellulose is 

 variable in quantity. Cell-walls differentiated into primary, 

 secondary, and tertiary. Pore-canals large. Internal part 

 of the endosperm consists of thick-walled, elongated cells. 

 All of the cells contain protein grains. 



Embryo. Cells of the outer row smaller than those 

 within; exterior walls thickened, those below more loosely 

 arranged than the epidermal ; more compact and with thicker 

 walls than those of Astragalus tnexicanus. Cells contain fat 

 and protein grains but no starch, 



PAPILIONACEAE — Hedysaieae. 



Aeschynomene, L. 



Endosperm has been found in several species of Aeschyno- 

 mene. A. Selleri, A. falcata, and A. Jiuminensis were 

 studied by Schleiden and Vogel. A. paludosa was studied 

 by Payen with reference to the nature of cellulose. Lub- 

 bock, who studied the germination of Hedysarum coronarium, 

 which belongs to the same group, states that endosperm is 

 absent from this species. He also studied Aeschynomene as- 

 j)era but says nothing about the endosperm. Marloth studied 

 Hedysarum with reference to its protection . The Hedysareae 

 appear to vary in regard to the presence of starch. Orni- 

 thopus saiivus is without starch, while Onohrychis saliva has 

 an abundance of round starch grains. Harz gives a key for 

 some of the European genera, based on the abundance of 

 starch. Hedysarum flexuosum, H. fruticosum and CoroniUa 

 varia have an abundance of starch. In H. capitatum^ Uor- 

 onilla glauca, and O. coronata, starch grains are not abund- 

 ant. Iodine does not always color the starch. In the second 

 group, the starch is colored only on the addition of potas- 

 sium hydrate. O. scorpioides is without starch. 



Aeschynomene hispid a, Willd. {A. vlrginica, L., BSP.) 



Fl.XV.f.4. 



Testa and endosperm 318.8 /x thick. Endosperm'somewhat 

 variable. 



