Leaves: blades 6-15 cm × 2-4 mm, distalmost reduced to scales. Calyculus bractlets 1-5 mm. Involucres 12-18 × 4-5 mm. Phyllaries 16-20 mm, faces glabrous. Corollas 15-16 mm. Cypselae 8-10 mm; pappi 6-8 mm. 2n = 12.

Flowering Jul-Sep. Sandy soils of stream banks, dunes, and sand hills in prairies; 300-1500 m; Alta., Man., Sask.; Colo., Iowa, Kans., Minn ., Nebr., N.Dak., Okla., S.Dak., Tex., Utah, Wyo.

Shinnersoseris rostrata grows in the Prairies and Great Plains region of North America.

Taprooted, glabrous annual to 8 dm, freely branched at least above; lvs linear, to 15 cm נ4 mm, the lower several pairs opposite, the others alternate, the uppermost reduced to linear bracts; heads terminating the branches; invol 12-17 mm, with 7 or 8 principal bracts; fls 8-11, the ligule lavender with white tip, 5-7 נ1 mm, ±erect; achenes columnar-fusiform, 8-10-ribbed, scabrellous near the tip; 2n=12. Open, sandy places; w. Io. to w. Minn., N.D., n. Tex., Wyo., and Utah. July-Sept. (Shinnersoseris r.)

Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.

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