. Botanical and vegetation survey of Carter County, Montana, Bureau of Land Management-administered lands . Botany; Rare plants. Cyperus schweinitzii Torrey SCHWEINITZ FLATSEDGE Sedge Family (Cyperaceae) CONSERVATION STATUS Fish and Wildlife Service: None. Bureau of Land Management: Watch. Montana Natural Heritage Program: G5 S1; Demonstrably secure globally, but may be critically imperiled in Montana where it is extremely rare. DESCRIPTION: Schweinitz flatsedge is a grass-like perennial with stems, 10-40 cm (4-16 in) high, from short, irregularly swollen rhizomes. The are 1 -4 mm wide an
. Botanical and vegetation survey of Carter County, Montana, Bureau of Land Management-administered lands . Botany; Rare plants. Cyperus schweinitzii Torrey SCHWEINITZ FLATSEDGE Sedge Family (Cyperaceae) CONSERVATION STATUS Fish and Wildlife Service: None. Bureau of Land Management: Watch. Montana Natural Heritage Program: G5 S1; Demonstrably secure globally, but may be critically imperiled in Montana where it is extremely rare. DESCRIPTION: Schweinitz flatsedge is a grass-like perennial with stems, 10-40 cm (4-16 in) high, from short, irregularly swollen rhizomes. The are 1 -4 mm wide and located mostly near the base. The inflorescence is subtended by 3-6 long leaf-like bracts, some wider than the leaves. The inflorescence is made of up ascending clusters of flattened spikelets that are 5-25 mm long, borne on very short to long stalks. Flowers consist of only a small pointed scale, ca. 3-4 mm long, subtending 3 stamens and an ovary. The seed is triangular in cross-section. Fruiting in late June-August. This is the only perennial CYPERUS in Montana, and the only one occurring in an upland habitat. GEOGRAPHICAL DISTRIBUTION Global distribution: Great Lakes, Midwest and Great Plains, with many outliers; from Quebec to Alberta, south to New Jersey, Texas, and New Mexico (Great Plains Flora Association 1986). Montana distribution: Scattered dune and outcrop areas and possibly along major eastern rivers; a total of six occurrences are now known from Carter, Cascade, Custer, and Sheridan counties. Carter County distribution: Prior to 1997, Cyperus schweinitzii was known from one population at Medicine Rocks State Park. In 1997 two populations were found on BLM land in the vicinities of Mill Iron and Pine Hill in the north part of the county. Cyperus schweinitzii Schweinitz' Flatsedge. Montana Natural Heritage Program May 1998 HABITAT: The species is restricted to sand dune habitats or coUuvial slopes below eroding sandstone outcrops. The Custer County occurrence is n
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