cauline leaves 1–4simple or 3-foliolateblade 2–10 × 3–15 cm. Inflorescences narrow panicles15–70-flowered10–70 × 1–5 cm. Pedicels subtended by finely dissected bracts0.1–1.2 cmglandular-stipitate. Flowers: hypanthium campanulate2–3 mmglandular-stipitateperianth somewhat bilaterally symmetricpetals caducousspreadinglinear or subulateunlobed2–3 × 0.5 mmbase clawedapex attenuateanthers oblong0.4–0.5 mm. Capsules 0.6–0.9 cm. Seeds 2–6ovoid1.2–1.5 × 0.6–0.9 mm.w North America.
Discussion
Varieties of Tiarella trifoliata have overlapping ranges and differ from each other in leaf form and marginal dissection. Their floral features are stable throughout. They were previously suspected of hybridizing when sympatric. They are differentiated along elevational gradients and often remain distinct in sympatric populations.
