Compilation
Boykinia aconitifolia

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Name

Identification
Boykinia aconitifolia Nutt. [family SAXIFRAGACEAE ] (stored under name);
Related name
  • Heuchera foliosa
  • Boykinia aconitifolia
  • Heuchera sp.
  • Boykinia major
  • Saxifraga elata
Common name
  • Brook saxifrage, Flora of North America Vol. 8

Flora

Entry for Boykinia aconitifolia Nuttall [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 aconitifolia Nuttall [family SAXIFRAGACEAE], J. Acad. Nat. Sci. Philadelphia, 7: 113. 1834 ,
Boykinia turbinata (Rydberg) Fedde [family SAXIFRAGACEAE]
Saxifraga aconitifolia (Nuttall) Fielding & Gardner [family SAXIFRAGACEAE]
Therofon aconitifolium (Nuttall) Millspaugh [family SAXIFRAGACEAE]
Therofon turbinatum Rydberg [family SAXIFRAGACEAE]
Treatment Author(s)
Richard J. Gornall
Information
Plants: rhizomes proliferating underground. Flowering stems 15–80 cm. Basal leaves: petiole 3–18(–31) cm; blade usually reniform, rarely orbiculate-cordate, 3–7-lobed to 1/2–3/4 its length, (2.5–)4–8(–12) × (3–)5–13(–15.5) cm, margins usually 2–3-times dentate, rarely crenate. Cauline leaves: stipules 1–8 mm, either expansions of petiole base, fringed with brown hairs, or foliaceous. Inflorescences ± pyramidal, 5–20(–30)-flowered per primary branch. Pedicels densely stipitate-glandular. Flowers: hypanthium campanulate to turbinate, free portion 0.7–1 mm, densely stipitate-glandular; sepals erect, lanceolate to narrowly lanceolate, 1–2(–2.5) mm, apex acute; petals spatulate to ovate, 3–6 × 1–3 mm, 2–3(–4) times as long as sepals, base tapered to claw, margins plane; nectary green; stamens 0.9–1.4 mm; ovary subinferior. Capsules ovoid, turbinate, or urceolate. Seeds usually black, tuberculate. 2n = 14.
Phenology
Flowering summer
Altitude range
300–1000 m
Distribution
USA Ala.USA Ga.USA Ky.USA N.C.USA S.C.USA Tenn.USA Va.USA W.Va.
Discussion
Boykinia aconitifolia from Alabama and Georgia with turbinate capsules and rounded-ovate leaf marginal teeth have been separated as B. turbinata from plants with the more usual urceolate capsules and leaf margins with ovate or triangular teeth. These characters, however, are not closely correlated and it seems better to recognize a single variable species. It is sometimes grown in gardens.
Rafinesque applied the name Therofon napelloides to this species, citing Nuttall’s Boykinia aconitifolia as a synonym. The former is therefore illegitimate.

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