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General: Grass Family (Poaceae). Sweetgrass is a fragrant, rhizomatous, perennial grass that reaches a height of 7 dm. (30 in.). The stems are hollow and hairless with open sheaths. The leaf blades are flat at maturity, usually glabrous, 10-30 cm. (3.9-11.8 in.) long. The sweetgrass inflorescence is an open panicle 4-9 cm. (1.6-3.5 in.) long; the lower branches are drooping to spreading. The spikelets are three-flowered, the two lowest florets staminate (male) and the uppermost is perfect (both female and male). Sweetgrass is an early blooming plant and flowers from May to July.