Flora of North America species comparison

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Boykinia rotundifolia

Boykinia major

round leaf boykinia, roundleaf brookfoam, roundleafed brookfoam

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

(30–)50–80(–130) cm.

(20–)50–130 cm.
Basal leaves

petiole 5–22 cm;

blade usually orbiculate-cordate, sometimes reniform, shallowly and indistinctly lobed, (3.5–)7–16 × (4–)9–18 cm, margins 2–3-times serrate.

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 1–2 mm expansions of petiole base, fringed with brown hairs.

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

± pyramidal, (10–)15–25-flowered per primary branch.

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

densely stipitate-glandular.

densely stipitate-glandular.
Flowers

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

sepals erect, triangular to lanceolate, 1.5–2 mm, apex acute;

petals narrowly spatulate, 2–3 × 1 mm, shorter than or to 1.5 times as long as sepals, base tapered to claw, margins plane;

nectary green;

stamens 1.2–1.6 mm;

ovary 2/3 inferior.

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.

ovoid, turbinate, or urceolate.
Seeds

usually black, tuberculate.

usually black, tuberculate.
2n

= 14.

= 28.

Boykinia rotundifolia

Boykinia major
Phenology Flowering early-mid summer. Flowering summer(-early autumn).
Habitat Damp woodlands, margins of lakes, ponds, and watercourses, often on disturbed soil, trailsides, mudslides Wet woodlands, margins of lakes, ponds, and watercourses
Elevation 800-2000 m (2600-6600 ft) 200-2200 m (700-7200 ft)
Distribution
from FNA
CA; Mexico (Baja California)
[WildflowerSearch map]
[BONAP county map]
from FNA
CA; ID; MT; OR
[WildflowerSearch map]
[BONAP county map]
Discussion

The record of Boykinia rotundifolia from “Lower California” (Williamson, 20 July 1901, PH) is the only collection seen from Mexico. The species is occasionally grown in gardens.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

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. 128. FNA vol. 8, p. 127.
Parent taxa Saxifragaceae > Boykinia Saxifragaceae > Boykinia
Sibling taxa
B. aconitifolia, B. intermedia, B. major, B. occidentalis, B. richardsonii
B. aconitifolia, B. intermedia, B. occidentalis, B. richardsonii, B. rotundifolia
Synonyms Therofon rotundifolium Therofon major
Name authority Parry ex A. Gray: Proc. Amer. Acad. Arts 13: 371. (1878) 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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