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Grass Family (Poaceae). Sand dropseed is a warm season, weak, perennial bunch grass. The height ranges from 2 to 3 feet. The leaf blade is flat and about 1/8 inch wide; tapering toward tip and rolling inward as the plant matures. The leaf sheath is longer than the internodes and the upper sheath partly or entirely encloses seedhead. The ligule is a conspicuous tuft of long white hair. The seedhead is a open panicle densely flowered and often in pairs, sometimes hairy at axial of branch and stem; spikelets less than 1/8 inch long, lead colored and one glume twice as long as the other.