216 Trans. Acad, Sci. of St. Louis. 



Undosperm. In the widest part 30 //- thick. The aleurone 

 layer consists of smaller cells, the remainder, of thick-walled 

 reserve cellulose. 



Embryo. Epidermal cells smaller than the underlying 

 parenchyma of the inferior face. Several rows of elongated 

 palisade cells on the superior face. Cells contain fat and 

 protein but no starch. 



MIMOSEAE — Acacieae. 



Acacia, To urn. 



Anatomically the genus is closely allied to Desmanthus and 

 Cassia. The thick- walled sclerotic cells of the nutrient layer 

 are like those of Cassia and Gymnocladus. The endosperm 

 is much reduced, nor is the inner integument evident. 



Acacia filicina, Willd. {A. fiUculoides,* Cav., Treleaae.) 



PL XXX. f. 2 -2b. 



Malpighian. Cuticle not well-developed; the cuticular- 

 ized layer a narrow zone ; light line in the upper third of the 

 cell; cell-cavity wide at the base, becoming very narrow in 

 the region of the light line. 



Osteosclerid. Cells small, I-shaped, with a small cavity. 



Nutrient. Layer is divided into two parts. Cells of the 

 upper part thick-walled. Cells of the lower elongated and 

 the walls not so thick. 



Endosperm. Much reduced, consisting of a single row of 

 cells, the aleurone layer. 



Emhyro. Epidermal cells of the cotyledons small, usually 

 a little longer than broad. The parenchyma cells of the inner 

 face much larger than those of the epidermis, with small 

 intercellular spaces. A single row of palisade cells on the 

 superior face of the cotyledons ; these are smaller than the 

 underlying parenchyma. Cells contain fat and protein. 



* This is an error in Britton and Brown's Illustrated Flora. Cavanilles 

 (Ic. 1 : 55. pi. 78. 1791) wrote Mimosa fiUcioides and is correctly quoted in 

 Watson's Bibliographical Index. In Kew Index it is given as Mimosa fiU- 

 coides Cav. 



