†† Hairs abundant on both surfaces.
Holcus lanatus. Very hairy above and below, and at the margins. Slight keel with sclerenchyma band: sclerenchyma at margin slight. Ridges rounded, about twice as high as thickness between. Stomata more abundant above. Cuticle very thin and leaf soft. All bundles except the mid-rib with girders. Motor-cells fairly well developed between the ridges (Fig. [15]).
Kœleria cristata. Very hairy on both surfaces. Ridges irregular, the largest flat and high, the others rounded or triangular. Vascular bundles isolated, and the sclerenchyma reduced to a few cells in a single layer beneath the epidermis at the apex of each ridge and below the bundle. Motor-cells well developed in each furrow. Stomata more numerous above.
✲✲ No girders to the vascular bundles.
Lolium perenne. Ridges numerous and unequal. Vascular bundles sheathed and isolated—i.e. devoid of girders: small patches of sclerenchyma at the apex of each stronger ridge, and on the opposite side below only. No hairs.
Lolium temulentum is similar but is more apt to be convolute, whereas L. perenne is more folded.
Alopecurus pratensis. Leaf thin and somewhat like Phleum, but the ridges somewhat higher and more rounded, and only the principal bundles girdered below. Stomata on both faces.
Festuca elatior, Bromus giganteus and most species of Agrostis come near Lolium. See Figs. [17], [22].