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FNA | Family List | FNA Vol. 8 | Saxifragaceae | Tiarella

2. Tiarella trifoliata Linnaeus, Sp. Pl. 1: 406. 1753.

Three-leaf foamflower Three-leaf foamflower

Flowering stems 10-70 cm. Leaves simple or 3-foliolate; cauline leaves 1-4, simple or 3-foliolate; petiole 0.2-20 cm; blade 2-10 × 3-15 cm. Inflorescences narrow panicles, 15-70-flowered, 10-70 × 1-5 cm. Pedicels subtended by finely dissected bracts, 0.1-1.2 cm, glandular-stipitate. Flowers: hypanthium campanulate, 2-3 mm, glandular-stipitate; perianth somewhat bilaterally symmetric; sepals spreading at anthesis, reflexed in fruit, 1-1.5 × 0.5-0.8 mm; petals caducous, spreading, linear or subulate, unlobed, 2-3 × 0.5 mm, base clawed, apex attenuate; stamens unequal, 3-4 mm and 1.8-2.5 mm; anthers oblong, 0.4-0.5 mm. Capsules 0.6-0.9 cm. Seeds 2-6, ovoid, 1.2-1.5 × 0.6-0.9 mm.

Varieties 3 (3 in the flora): w North America.

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.


1 Basal leaves usually simple; cauline leaves rarely trifoliolate, shallowly to deeply lobed, leaflets sessile.   2c Tiarella trifoliata var. unifoliata
+ Basal leaves 3-foliolate; cauline leaves 3-foliolate; leaflets deeply lobed, petiolulate   (2)
       
2 (1) Leaflet lobes to 1/2 length of leaflet, distal segments not laciniate.   2a Tiarella trifoliata var. trifoliata
+ Leaflet lobes more than 1/2 length of leaflet, distal segments laciniate.   2b Tiarella trifoliata var. laciniata

Lower Taxa


 

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