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Boykinia
Family: Saxifragaceae
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  • Gleason & Cronquist
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Richard J. Gornall in Flora of North America (vol. 8)
Herbs, rhizomatous, not stoloniferous (± stoloniferous in B. intermedia). Flowering stems erect, leafy, 10-130 cm, densely stipitate-glandular and eglandular-pubescent. Leaves in basal rosette and cauline; cauline leaves similar to basal, gradually reduced distally to sessile bracts; stipules present; petiole densely stipitate-glandular; basal leaf blades reniform to reniform-orbiculate or cordate, shallowly lobed to deeply cleft, base cordate, ultimate margins crenate to serrate, apex acute or rounded, surfaces stipitate-glandular, adaxial surface grooved over veins; venation palmate. Inflorescences compound, dichasial cymes, terminal from terminal bud in rosette, branches (3-)5-20(-30)-flowered, bracteate. Flowers ± radially symmetric; hypanthium adnate 1/2-5/6 to ovary, free from ovary 0.7-3 mm, usually green, sometimes purple; sepals 5, green to purple; petals 5, white (sometimes with pink veins in B. richardsonii); nectary tissue encircling base of styles at junction of ovary and free hypanthium; stamens 5; filaments linear to subulate; (anthers apiculate or obtuse); ovary 2/3 to completely inferior, 2-locular, carpels connate proximally; placentation axile; styles 2; stigmas 2. Capsules 2-beaked. Seeds (ca. 50-500), usually black, (brown in B. richardsonii), ellipsoid, tuberculate (smooth in B. richardsonii). x = 7. The Japanese species is Boykinia lycoctonifolia (Maximovicz) Engler, which, based on its morphology, seems to be most closely related to B. aconitifolia.

Vascular plants of NE US and adjacent Canada
Fls perfect, regular, ±epigynous with a prolonged, deeply cupulate or campanulate hypanthium bearing the sep, pet, and stamens at its margin; pet obovate or spatulate, deciduous; stamens 5, opposite and shorter than the sep; carpels 2, connate below to form a bilocular ovary with numerous ovules on axile placentas, tapering above into the 2 short, distinct stylar beaks that eventually dehisce ventrally; stigmas capitate; capsule largely contained within the persistent hypanthium; seeds wingless; rhizomatous perennial herbs with basal and alternate, long-petioled, ±stipulate, palmately lobed lvs and panicled cymes of small white fls. 7, N. Amer.

Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.

©The New York Botanical Garden. All rights reserved. Used by permission.
Boykinia aconitifolia
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Boykinia heucheriformis
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Boykinia intermedia
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Boykinia jamesii
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Boykinia major
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Boykinia occidentalis
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Boykinia ranunculifolia
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Boykinia richardsonii
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Boykinia rotundifolia
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