The stem of _Panicum ramosum_ is semi-circular and somewhat flat on one side. The epidermal cells alone are thickened. There is a broad well developed continuous band of sclerenchyma, which is connected at regular intervals with the epidermis by small vascular bundles. Another row of vascular bundles lies just inside the sclerenchymatous ring and each of these bundles is in contact with the band. Away from the ring lie a number of bundles forming a series disposed in two irregular rings around a broad portion of the ground tissue. (See figs. 31 and 32.) [Illustration: Fig. 34.--Transverse section of a portion of the stem of Andropogon caricosus. x 75 1. Epidermis; 2. sclerenchyma; 3. vascular bundle.] [Illustration: Fig. 35.--Transverse section of a portion of the stem of Panicum Isachne. x 100 1. Epidermis; 2. sclerenchyma; 3. vascular bundle.] The stem of the grass _Andropogon caricosus_ is oval in outline, the front being flat. The epidermal cells and those below and in contact with them are thick-walled. The sclerenchymatous ring though present is very narrow and not very conspicuous. It consists of one or two layers of cells connecting a few vascular bundles forming the outermost set. There is a series of vascular bundles inside the ring which surrounds a large area of the ground tissue. Two isolated bundles, one in front and another at the back of the ground tissue, are found. The cells of the ground tissue lying just inside the vascular bundles are all very much thickened. (See figs. 33 and 34.) [Illustration: Fig. 36.--Transverse section of the stem of Eragrostis interrupta. x 25] [Illustration: Fig. 37.--Transverse section of the stem of Panicum flavidum. x 15] [Illustration: Fig. 38.--Transverse section of a portion of the stem of Panicum flavidum. x 70 1. Epidermis; 2. sclerenchyma; 3. vascular bundle.] The stems of _Panicum Isachne_ and _Eragrostis interrupta_ are hollow. The stem of the former is circular in outline in cross section, though wavy. There is a sclerenchymatous ring close to the epidermis but separated from it by a few layers of parenchyma. One set of bundles is imbedded in the band, and another set just touches the inner border of it. A third series is disposed around a fairly large amount of ground tissue, which may or may not have a cavity in the centre. The stem of _Eragrostis_ _interrupta_ has more or less the same structure, but the cortex has air spaces here and there. Other minor differences may be seen on referring to figs. 35 and 36. [Illustration: Fig. 39.--Transverse section of a portion of the stem of Panicum colonum. x 70 1. Epidermis; 2. sclerenchyma; 3. vascular bundle.]