General: Grass Family (Poaceae). Chasmanthium latifolium (previously in the Uniola genus and commonly called broadleaf uniola) is a native, rhizomatous perennial often found in small colonies. The leaf shape and size are similar to many of the larger species of panic (Panicum species) grasses. The height of this grass and the inflorescence (seed cluster) somewhat resemble domestic oats; thus, the common name “wood, creek, or sea oats.” The weight of the seed heads causes the inflorescence to droop.
Stems are glabrous, relaxed and can reach heights of 1.5 m. Striated and glabrous leaves are found along the stem up to the base of the panicle. The leaves are broad (0.8 to 2.0 cm) and 10-20 cm long. Blade sheaths are small and glabrous. Panicles are open and drooping with relaxed branching. Spikelets have 9-26 florets and are broad and flattened. They range in lengths of 1.5-4 cm and widths of 1-2 cm. Glumes and lemmas overlap; however, the glumes are smaller than the lemmas. The glumes are 7-9 nerved, keels rough to the touch, and range in lengths of 5-8 mm. The lemmas are 9-15 nerved, keels rough to the touch, and range in lengths of 8-13mm. Paleas are 6-10 mm long with thin and dry margins. Caryopsis is flat, oval in shape and range in lengths of 4-5 mm.
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