Flora of North America species comparison

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Boykinia major

large boykinia, mountain boykinia, Sierra brookfoam
Habit Plants: rhizomes proliferating underground.
Flowering stems

(20–)50–130 cm.
Basal leaves

petiole 5–25(–40) cm;

blade usually reniform, sometimes cordate, 3–7-lobed to 1/2–3/4 its length, 5–15(–22) × 7–18(–26) cm, margins 2–3-times dentate.
Cauline leaves

stipules (2–)6–20(–35) mm, foliaceous, smaller ones fringed with brown hairs.
Inflorescences

corymbiform, 8–15(–21)-flowered per primary branch.
Pedicels

densely stipitate-glandular.
Flowers

hypanthium saucer-shaped, free portion 1–2 mm, densely stipitate-glandular;

sepals spreading, triangular, 2–4 mm, apex acute;

petals suborbiculate to ovate, 4–7 × 2–5 mm, ca. 2 times as long as sepals, base contracted to claw 0.5–3 mm, margins undulate;

nectary yellow;

stamens (1.6–)2–3 mm;

ovary inferior.
Capsules

ovoid, turbinate, or urceolate.
Seeds

usually black, tuberculate.
2n

= 28.

Boykinia major
Phenology Flowering summer(-early autumn).
Habitat Wet woodlands, margins of lakes, ponds, and watercourses
Elevation 200-2200 m (700-7200 ft)
Distribution
from FNA
CA; ID; MT; OR
[WildflowerSearch map]
[BONAP county map]
Discussion

Records of Boykinia major from Alaska (G. W. Cooley 1892) relate to specimens of Heuchera glabra. Some populations from Idaho are polymorphic for dentate versus entire petals, and some plants from northern California have purple blotches proximally on the petals. Specimens intermediate in gross morphology between B. major and B. occidentalis, and which match synthetic hybrids, have been collected from Lane County, Oregon (R. J. Gornall and B. A. Bohm 1985). Boykinia major is occasionally grown in gardens.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 8, p. 127.
Parent taxa Saxifragaceae > Boykinia
Sibling taxa
B. aconitifolia, B. intermedia, B. occidentalis, B. richardsonii, B. rotundifolia
Synonyms Therofon major
Name authority A. Gray: in W. H. Brewer et al., Bot. California 1: 196. (1876)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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