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2a. Tiarella trifoliata Linnaeus var. trifoliata
Basal leaves 3-foliolate; blade 2-10 × 3-15 cm; leaflets petiolulate, deeply lobed. Cauline leaves 3-foliolate; blade 2 × 3 cm; leaflet lobes to 1/2 length of leaflet, distal segments not laciniate. 2n = 14.
Flowering May-Aug; fruiting Jul-Oct. Shaded, moist woods; 0-1300 m; Alta., B.C.; Alaska, Calif., Idaho, Mont., Oreg., Wash.
Variety trifoliata has slender roots and caudices.
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