Wrinkled Joint Tail Grass

Coelorachis rugosa (Nutt.) Nash
Rottboellia rugosa Nutt. Gen. 1 : 84. 1818.
Rottboellia corrugata Baldw. Am. Jour. Sci. 1 : 355. 1819.
Rottboellia rugosa Chapmani Hack, in DC. Monog. Phan. 6 : 308. 1889.
Manisuris rugosa Kuntze, Rev. Gen. 780. 1891.
Manisuris Chapmani Nash, in Small, Fl. SF. U. S. 56. 1903.
Stems tufted, much compressed, 6-15 dm. tall, stout; leaf-sheaths much flattened, broad, keeled ; blades 4 dm. long or less, 10 mm. wide or less; racemes exserted or somewhat included at the base, sometimes spreading, 4-8 cm. long, straight or a little curved, the rachis-internodes often much contracted at the base, glabrous or puberulent ; sessile spikelet 3.5-5 mm. long, about equaling or a little exceeding the internode, the first scale often 2-toothed at the obtuse apex, strongly transversely wrinkled, the wrinkles much elevated and often extending across the entire width of the scale, the longitudinal ridges usually rather prominent ; pedicellate spikelet smaller, of 2 scales, empty, or sometimes bearirfg a staminate flower.
Type locality : Florida.
Distribution : Southern New Jersey, Delaware, and Maryland to Florida and Texas.