Flora of North America species comparison

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Boykinia rotundifolia

Boykinia occidentalis

round leaf boykinia, roundleaf brookfoam, roundleafed brookfoam

coast boykinia, coastal brookfoam, western boykinia
Habit Plants: rhizomes proliferating underground. Plants: rhizomes proliferating underground.
Flowering stems

(30–)50–80(–130) cm.

15–60(–100) 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 (3–)6–18(–27) cm;

blade usually ± orbiculate-cordate, sometimes reniform, 3–9-lobed to 1/2 its length, (1.5–)2–8(–11) × (1.5–)3–8(–12) cm, margins 2–3-times crenate to dentate.
Cauline leaves

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

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

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

pyramidal, 5–10(–19)-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 campanulate to turbinate, free portion (0.7–)0.9–1.2(–1.8) mm, densely stipitate-glandular;

sepals erect, lanceolate to narrowly lanceolate, 1–2.5 mm, apex acute;

petals spatulate to ovate, (2.5–)4–6(–7) × 1–2 mm, 2–3 times as long as sepals, base tapered to claw, margins plane;

nectary green;

stamens 1–1.5 mm;

ovary 3/4 inferior.
Capsules

ovoid, turbinate, or urceolate.

ovoid, turbinate, or urceolate.
Seeds

usually black, tuberculate.

usually black, tuberculate.
2n

= 14.

= 14.

Boykinia rotundifolia

Boykinia occidentalis
Phenology Flowering early-mid summer. Flowering summer.
Habitat Damp woodlands, margins of lakes, ponds, and watercourses, often on disturbed soil, trailsides, mudslides Damp woodland, margins of lakes, ponds, bogs, and watercourses, often on disturbed soil, trailsides, mudslides
Elevation 800-2000 m (2600-6600 ft) 0-1400(-1700) m (0-4600(-5600) ft)
Distribution
from FNA
CA; Mexico (Baja California)
[WildflowerSearch map]
[BONAP county map]
from FNA
CA; OR; WA; BC
[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.)

The nomenclature of Boykinia occidentalis has been reviewed by R. J. Gornall and B. A. Bohm (1985). It is a polymorphic species but is not as variable as the extensive synonymy might suggest. Taxa have been described on the basis of variation in inflorescence shape, pubescence, stem color, and sepal orientation. It has been shown that these characters are subject to phenotypic plasticity or developmental age and, as such, provide no grounds for dividing the species (Gornall and Bohm). It is sometimes 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. major, B. richardsonii, B. rotundifolia
Synonyms Therofon rotundifolium B. cincinnata, B. elata, B. elata var. cincinnata, B. elata var. occidentalis, B. nuttallii, B. occidentalis var. cincinnata, B. occidentalis var. elata, B. vancouverensis, Saxifraga elata, Therofon cincinnatum, Therofon elatum, Therofon occidentale, Therofon vancouverense
Name authority Parry ex A. Gray: Proc. Amer. Acad. Arts 13: 371. (1878) Torrey & A. Gray: Fl. N. Amer. 1: 577. 1840 ,
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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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