Several species of this genus are cultivated as garden plants. The pasqueflower, Pulsatilla patens (L.) Mill. or Anemone patens L., which ranges east in prairies and other dry places as far as Lake Michigan, has been attributed to Michigan repeatedly, but no specimens are known; it is a silky-pubescent plant with plumose styles in fruit (as in Clematis). Anemone parviflora Michx. is a northern species that ranges south to Lake Superior in Ontario and might yet be discovered in Michigan; it has one-flowered peduncles bearing a pair of lobed bracts and rounded or blunt-lobed basal leaves very similar to those of Coptidium lapponicum; the sepals are whitish. See also note under Hepatica.
1. Lobes of leaf linear, entire, ca. 1.5–4 (–5) mm wide; perianth usually maroon (rarely cream); achenes densely long-woolly.
1. Lobes of leaf ± cuneate to convex, sharply toothed, often broader; perianth white, cream, or greenish; achenes various.
2. Achenes pubescent with ± straight hairs (silky when young but not woolly or sinuous and not so dense as to conceal the surface); fruiting head nearly spherical; cauline leaves sessile or basal leaves absent; mature perianth white.
3. Cauline (involucral) leaves sessile, cleft more than half their length but not compound; basal leaves long-petioled; achenes flat.
3. Cauline leaves on distinct slender petioles, cleft so deeply as to be compound; basal leaves absent at flowering time (separate vegetative leaves frequent); achenes plump.
4. Petaloid sepals usually 5; flowers 13–32 mm in diameter; plants from creeping rhizomes.
4. Petaloid sepals 8–20; flowers ca. 30–50 mm in diameter; rhizome tuberous.
2. Achenes densely woolly with long sinuous hairs nearly or quite obscuring the surface; fruiting head ovoid to long-cylindrical; cauline leaves petioled and basal leaves also present; mature perianth white to cream or greenish.
5. Peduncles all (or usually at least 2 of them) bractless, the bracts and involucral (cauline) leaves crowded in one cluster of 4–9 at the base of the peduncles; divisions of leaf narrowly cuneate with straight to slightly concave sides toothed only well beyond the middle of the blade; fruiting head cylindrical, ca. 2–4 times as long as thick (not over 1 cm thick); pubescence (of peduncles, upper part of stem, and lower surfaces of leaves) silky and ± appressed or ascending.
5. Peduncles (all except the leading one) with a pair of bracts, the involucral leaves only 3 at the base of the peduncles; divisions of leaf broadly cuneate to (usually) ± convex on the sides, toothed to or below the middle of the blade; fruiting head ovoid to thick-cylindric, up to 2.5 times as long as thick (as thick as 1.7 cm); pubescence (especially of stems and leaves) sparser and more spreading (though usually silky on peduncles).