Boykinia occidentalis

Torrey & A. Gray

Fl. N. Amer. 1: 577. 1840 ,.

Common names: Coast boykinia
Synonyms: Boykinia cincinnata (Rosendahl & Rydberg) Fedde Boykinia elata (Nuttall) Greene Boykinia elata var. cincinnata (Rosendahl & Rydberg) Rosendahl ex Engler Boykinia elata var. occidentalis (Torrey & A. Gray) Rosendahl ex Engler Boykinia nuttallii Nuttall Boykinia occidentalis var. cincinnata (Rosendahl & Rydberg) Rosendahl Boykinia occidentalis var. elata (Nuttall) A. Gray Boykinia vancouverensis (Torrey & A. Gray) Kuntze Saxifraga elata Rydberg Therofon cincinnatum Therofon elatum Therofon occidentale Therofon vancouverense
Treatment appears in FNA Volume 8. Treatment on page 127. Mentioned on page 126, 128.

Plants: rhizomes proliferating underground. Flowering stems 15–60(–100) cm. Basal leaves: 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. Inflorescences pyramidal, 5–10(–19)-flowered per primary branch. Pedicels densely stipitate-glandular. Flowers: 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. Seeds usually black, tuberculate. 2n = 14.

Phenology: Flowering summer.
Habitat: Damp woodland, margins of lakes, ponds, bogs, and watercourses, often on disturbed soil, trailsides, mudslides
Elevation: 0-1400(-1700) m


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B.C., Calif., Oreg., Wash.


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.

Selected References


Lower Taxa

... more about "Boykinia occidentalis"
Richard J. Gornall +
Torrey & A. Gray +
Coast boykinia +
B.C. +, Calif. +, Oreg. +  and Wash. +
0-1400(-1700) m +
Damp woodland, margins of lakes, ponds, bogs, and watercourses, often on disturbed soil, trailsides, mudslides +
Flowering summer. +
Fl. N. Amer. +
Illustrated +  and Endemic +
Boykinia cincinnata +, Boykinia elata +, Boykinia elata var. cincinnata +, Boykinia elata var. occidentalis +, Boykinia nuttallii +, Boykinia occidentalis var. cincinnata +, Boykinia occidentalis var. elata +, Boykinia vancouverensis +, Saxifraga elata +, Therofon cincinnatum +, Therofon elatum +, Therofon occidentale +  and Therofon vancouverense +
Boykinia occidentalis +
Boykinia +
species +