Flora of North America species comparison

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Boykinia rotundifolia

Boykinia aconitifolia

round leaf boykinia, roundleaf brookfoam, roundleafed brookfoam

Allegheny brookfoam, brook saxifrage
Habit Plants: rhizomes proliferating underground. Plants: rhizomes proliferating underground.
Flowering stems

(30–)50–80(–130) cm.

15–80 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 3–18(–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 1–2 mm expansions of petiole base, fringed with brown hairs.

stipules 1–8 mm, either expansions of petiole base, fringed with brown hairs, or foliaceous.
Inflorescences

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

± pyramidal, 5–20(–30)-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 0.7–1 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.

ovoid, turbinate, or urceolate.
Seeds

usually black, tuberculate.

usually black, tuberculate.
2n

= 14.

= 14.

Boykinia rotundifolia

Boykinia aconitifolia
Phenology Flowering early-mid summer. Flowering summer.
Habitat Damp woodlands, margins of lakes, ponds, and watercourses, often on disturbed soil, trailsides, mudslides Moist woodland, margins of lakes, ponds, and watercourses
Elevation 800-2000 m (2600-6600 ft) 300-1000 m (1000-3300 ft)
Distribution
from FNA
CA; Mexico (Baja California)
[WildflowerSearch map]
[BONAP county map]
from FNA
AL; GA; KY; NC; SC; TN; VA; WV
[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.)

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.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 8, p. 128. FNA vol. 8, p. 126.
Parent taxa Saxifragaceae > Boykinia Saxifragaceae > Boykinia
Sibling taxa
B. aconitifolia, B. intermedia, B. major, B. occidentalis, B. richardsonii
B. intermedia, B. major, B. occidentalis, B. richardsonii, B. rotundifolia
Synonyms Therofon rotundifolium B. turbinata, Saxifraga aconitifolia, Therofon aconitifolium, Therofon turbinatum
Name authority Parry ex A. Gray: Proc. Amer. Acad. Arts 13: 371. (1878) Nuttall: J. Acad. Nat. Sci. Philadelphia 7: 113. 1834 ,
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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