76 CLASSIFICATION ACCORDING TO [CH. 
== Veins not more than 10—20 in each half 
lamina. 
© More or less conspicuously hairy. The smaller 
bundles isolated and devoid of girders. 
Bromus sterilis. Guirders to the stronger bundles only. 
Stiff hairs above and below. Motor-cells poorly developed 
between each pair of low ridges. No pronounced cuticle. 
A faint sclerenchyma-band at margin, and at apex of low 
rounded keel. Stomata on both faces. 
Bromus arvensis. Similar to B. sterilis, with stiff 
hairs commoner below. Harsh in cutting. 
B. giganteus shows no hairs, but I cannot distinguish the Bromes 
generally by the leaf anatomy. 
Anthoxanthum odoratum. No keel, ridges obsolete, 
the stronger bundles only with girders. Motor-cells con- 
spicuous between all the ribs. Marginal sclerenchyma, 
and that above and below the bundles, poorly developed. 
A few coarse hairs both above and below, and stomata on 
both faces. Leaf thin and narrow. 
Hordeum murinum. Few girdered bundles, and 
sclerenchyma at margins poor. Hairs sparse and coarse. 
Bromus asper, Brachypodium sylvaticum and Lagurus 
also come here. 
In all these grasses the epidermal cells are chiefly long, rect- 
angular or slightly hexagonal, with thin and plane walls. 
©©@® Hairs none or very rare on the sections. 
Phleum pratense. Low rounded ribs with motor-cells 
between. The larger vascular bundles girdered. Stomata 
about equal on both faces. No hairs. No keel. Marginal 
sclerenchyma scanty. 
