Compilation
Therofon cincinnatum

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Name

Identification
Isotype of Therofon cincinnatum Rosend. & Rydb. [family SAXIFRAGACEAE ] (stored under name); Verified by Not on sheet,
Related name
  • Therofon cincinnatum
  • Boykinia occidentalis
  • Boykinia elata
Common name
  • Coast boykinia, Flora of North America Vol. 8

Flora

Entry for Boykinia occidentalis Torrey & A. Gray [family SAXIFRAGACEAE]
Herbarium
Flora of North America (FNA)
Collection
Flora of North America
Resource Type
Reference Sources
Entry From
Flora of North America, Vol 8,
Names
Boykinia occidentalis Torrey & A. Gray [family SAXIFRAGACEAE], Fl. N. Amer., 1: 577. 1840 ,
Boykinia cincinnata (Rosendahl & Rydberg) Fedde [family SAXIFRAGACEAE]
Boykinia elata (Nuttall) Greene [family SAXIFRAGACEAE]
Boykinia elata var. cincinnata (Rosendahl & Rydberg) Rosendahl ex Engler [family SAXIFRAGACEAE]
Boykinia elata var. occidentalis (Torrey & A. Gray) Rosendahl ex Engler [family SAXIFRAGACEAE]
Boykinia nuttallii J. M. Macoun [family SAXIFRAGACEAE]
Boykinia occidentalis var. cincinnata (Rosendahl & Rydberg) Rosendahl [family SAXIFRAGACEAE]
Boykinia occidentalis var. elata (Nuttall) A. Gray [family SAXIFRAGACEAE]
Boykinia vancouverensis (Rydberg) Fedde [family SAXIFRAGACEAE]
Saxifraga elata Nuttall [family SAXIFRAGACEAE]
Therofon cincinnatum Rosendahl & Rydberg [family SAXIFRAGACEAE]
Therofon elatum (Nuttall) Greene [family SAXIFRAGACEAE]
Therofon occidentale (Torrey & A. Gray) Kuntze [family SAXIFRAGACEAE]
Therofon vancouverense Rydberg [family SAXIFRAGACEAE]
Treatment Author(s)
Richard J. Gornall
Information
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
Altitude range
0–1400(–1700) m
Distribution
USA Calif.USA Oreg.USA Wash.Canada B.C.
Discussion
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.

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