18. Showy yellow flowers with 4 petals. Sepals point backward. May--August.
Leaves with even edges. Leaves 1/16--3/8 in. wide.
Plant with stems growing outward and upward or upward. Stems smooth to slightly hairy. 3--8 in.

Hartweg's evening primrose
Calylophus hartwegii, ssp. fendleri

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Kansas Heritage Group