552 WEED FLORA OF IOWA 



with prominent pore-canals ; the internal layer consisting of 

 elongated thick-walled cells, with cell cavity much reduced. 



Embryo. — First row of cells of embryo smaller than underlying, 

 with thickened outer walls. Cells below with small intercellular 

 spaces. Reserve material consists of fat and protein grains; 

 starch is absent. 



Stemless Loco Weed (Oxytropis lamberti Pursh.). 



Testa and endosperm 170-175^. This, the so-called loco weed, is 

 said to cause disturbances in animals, but alkaloids have not been 

 found in the seed or any other part of the plant. 



Malpighian. — Cells 40-42m long. Cuticle somewhat uneven; the 

 narrow well marked cuticularized layer colors blue with chlor- 

 iodide of zinc; the light line occurs below the cuticularized layer, 

 and this also colors blue; the remainder of the cell wall takes on 

 a darker blue color. Cells contain an abundance of pigment, 

 tannin, and some plastic material. 



Osteosclerid. — Cell walls thickened, not prominently I-shaped, 

 but with an elongated intercellular space. 



Nutrient. — Layer consists of thin-walled elongated cells from 

 ten to twelve rows. Pigment more abundant in lower than in 

 upper part. Walls color blue with chlor-iodide of zinc. 



Endosperm. — The aleurone layer consists of thick- walled cells; 

 the underlying thick-walled cells of the reserve cellulose become 

 mucilaginous on the addition of water. The internal part consists 

 of thick- walled, elongated cells. The cells contain protein. 



Embryo. — Cells of the first row smaller, with thick exterior 

 walls; cells below not so compact and with thinner walls. Cell 

 walls color blue with chlor-iodide of zinc. Starch is absent but 

 cells contain fat and protein. 



Bush Clover (Lespedeza capitatw Mx.). 



Testa and endosperm 90-100 thick. Light line occurs close 

 under the cuticle. A large spherical chromatophore occurs in the 

 pigmented Malphigian cells which is variable as to its position in the 

 cell. The long pores extend to the middle of the cell. The os- 

 teosclerids are short. The nutrient layer is compressed, containing 

 much pigment. Endosperm as in L. stuvei; the aleurone cells are 

 thick- walled, and the reserve cellulose is mucilaginous. Embryo 

 as in the other species containing fat and protein but no starch. 



