132 
IOWA ACADEMY OF SCIENCES. 
AN ANATOMICAL STUDY OP THE LEAVES OP SOME 
SPECIES OP THE GENUS ANDROPOGON. 
BY C. B. WEAVER. 
The purpose of the followiag paper and accompanying fig- 
ures is to make an additional contribution to the work already 
done toward our knowledge of the leaf anatomy of grasses. 
Reference to valuable literature along this line of scientific 
research may be found in the papers by Misses Pammel and 
Sirrine, on the genera Sporobolus and Panicum, published in 
vol. IIIj of the proceedings of Iowa Academy of Sciences for 
1895. 
ANDROPOGON PROVINCIALIS. 
(PI. xii, Figs. 2, 3 and 4; PI. xiv, Fig. 12.) 
In this species the epidermal cells (E. C.) are large, nearly 
round and variable in size. The cuticle (C.) is well developed. 
The stomata (Sto.) occur in small depressions. 
The bulliform cells (B. C.) vary in number from two to six. 
They seem to merge gradually into the epidermal cells and vary 
considerably in size. These cells occur between the secondary 
veins and below the mestome bundles. 
In this species four types of bundles occur, viz. : (1) carene, 
(2) entirely closed, (3) open, (4) larger secondary bundles with 
stereome (Ste.) both above and below. 
The carene (Car.) consists of three large bundles open above 
and below. The central bundle is but little larger than the 
secondary bundles. In the hadrome (H) occur the conspicuous 
pitted and spiral ducts. The chlorophyll-bearing parenchyma 
cells surrounding the larger bundles are not as conspicuous a& 
those of the smaller mestome bundles. The stereome (Ste.) 
above the carene is well developed and is wider than the middle 
larger bundle, while opposite on the lower side of the leaf 
occur but few stereome cells, and these latter are in direct con- 
tact with the epidermal cells. The cells composing the leptome 
portion (L) of the middle carene bundle are uniform in size.. 
