This is near the European variety _viride_ Milde, but differs in having bands on the ridges, no rosulæ in the grooves, and in the tumid joints. 5. _Suksdorfi_ var. nov. Stems 1 to 2½ feet high, 1 to 3 lines wide, about 24 angled, rough, with cross-walls of silex, rarely with ends elevated to two rows of tubercles; stomata in single rows, rarely double for a short distance, each stoma connected at top and bottom with its opposite by rows of rosulæ formed by the silex bands of the grooves throwing up tubercles on each cell of the epidermis, which open at top to circular jagged disks, these often obscured later by a washing of silex, but always shown near the tops of the stems and on the branches; sheaths elongated, cylindrical, tight, black, developing a ring of tawny white which gradually increases till it occupies the whole sheath except a narrow black basal ring and a narrow black limb formed by the horny tips of the leaves; leaves linear, narrowed above the middle, the lower 2-3 keeled, the upper third flat, rarely with a narrow carinal groove above, tipped with a small, black, horny, hyaline-bordered point; teeth articulated to the leaves, black-centered, soon fading, withering and deciduous. Anatomy of _hiemale_, the carinal bast elongated along the dissepiment, the vallecular much smaller but often similar in shape. Upper 1 to 3 nodes bearing 1 to 4 branches each, which overtop the stem and bear contemporaneous spikelets. This would be a noteworthy variety even if it bore no branches. It is the only American form of _heimale_ known to me, except occasionally _intermedium_ which bears branches with the first effort of growth. All the others develop them, if at all, after the stem has ceased to grow, and the vegetative energy, having no other outlet, pushes out a few of the latent buds lying between the ridges at the nodes. Bingen, Wash. High bottom land on the Columbia river. _W. N. Suksdorf_, September 3, 1902, No. 2161. 6. _Drummondi_ (Milde) _C. robustum Drummondi_ Milde, Mon. Equis. 593. Fertile stems 3 feet high, 16 angled; sheaths short, the lowest fuscous; teeth persistent, white, crispate; stomata often of 1 to 3 lines to a series, which are separated by 4 to 6 cells. Collected by Drummond at the Brazos river in Texas. It is very aberrant, but is placed here on account of its anatomy. I have not seen specimens of this.