Tiarella trifoliata var. unifoliata
Suneeti Jog in Flora of North America (vol. 8)
usually simple; blade 2-9 × 3-10 cm; leaflets sessile, deeply to shallowly lobed.
rarely 3-foliolate; blade 2 × 3 cm; leaflet lobes ca. 1/2 length of leaflet, distal segments laciniate.
= 14. Flowering Jun-Sep. Moist, dense woods; 300-1900 m; Alta., B.C.; Alaska, Calif., Idaho, Mont., Oreg., Wash. Variety
is relatively uniform throughout its range. Locally in Alberta, it grades into a more deeply lobed leaf form.
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