Boykinia aconitifolia

Nuttall

J. Acad. Nat. Sci. Philadelphia 7: 113. 1834 ,.

Common names: Brook saxifrage
Endemic
Synonyms: Boykinia turbinata (Rydberg) Fedde Saxifraga aconitifolia (Nuttall) Fielding & Gardner Therofon aconitifolium (Nuttall) Millspaugh Therofon turbinatum Rydberg
Treatment appears in FNA Volume 8. Treatment on page 126. Mentioned on page 127.

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.
Habitat: Moist woodland, margins of lakes, ponds, and watercourses
Elevation: 300-1000 m

Distribution

V8 251-distribution-map.gif

Ala., Ga., Ky., N.C., S.C., Tenn., Va., 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.

Selected References

None.

Lower Taxa

None.

"-3(-4)timesaslongassepals" is not declared as a valid unit of measurement for this property.

... more about "Boykinia aconitifolia"
palmate +  and grooved +
epigynous +, perigynous +  and hypogynous +
Richard J. Gornall +
Nuttall +
tapered +
8 cm80 mm <br />0.08 m <br /> (12 cm120 mm <br />0.12 m <br />) +
13 cm130 mm <br />0.13 m <br /> (15.5 cm155 mm <br />0.155 m <br />) +
4 cm40 mm <br />0.04 m <br /> (8 cm80 mm <br />0.08 m <br />) +
dentate +, serrate +  and entire +
glandular-ciliate +  and ciliate +
3-7-lobed +, orbiculate-cordate +  and reniform +
5cm +  and 13cm +
bracteate +  and (3-)5-20(-30)-flowered +
urceolate +, turbinate +  and ovoid +
3-carpellate +  and 2-carpellate +
Brook saxifrage +
Ala. +, Ga. +, Ky. +, N.C. +, S.C. +, Tenn. +, Va. +  and W.Va. +
300-1000 m +
linear +  and subulate +
unisexual +  and bisexual +
15 cm150 mm <br />0.15 m <br /> (80 cm800 mm <br />0.8 m <br />) +
2-3(-4)-beaked +  and folliclelike +
Moist woodland, margins of lakes, ponds, and watercourses +
multicellular +
free +  and adnate +
5-20(-30)-flowered +
opposite +  and alternate +
plane +  and crenate +
subinferior +
0.07 cm0.7 mm <br />7.0e-4 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
crassinucellate +, unitegmic +  and bitegmic +
stipitate-glandular +
epigynous +, perigynous +  and hypogynous +
distinct +
0.3 cm3 mm <br />0.003 m <br /> (?) +  and 0.6 cm6 mm <br />0.006 m <br /> (?) +
Spatulate (?) +  and Ovate (?) +
0.1 cm1 mm <br />0.001 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
peltate +  and jointed +
18 cm180 mm <br />0.18 m <br /> (31 cm310 mm <br />0.31 m <br />) +
stipitate-glandular +
3 cm30 mm <br />0.03 m <br /> (18 cm180 mm <br />0.18 m <br />) +
Flowering summer. +
unequal +
stipitate-glandular +
0.07 cm0.7 mm <br />7.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
J. Acad. Nat. Sci. Philadelphia +
proliferating +
underground +
spiny +  and ribbed +
straight +
tuberculate +
ellipsoid +
0.2 cm2 mm <br />0.002 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
green +  and purple +
distinct +
lanceolate +  and narrowly lanceolate +
0.1 cm1 mm <br />0.001 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
unbranched +  and branched +
persistent +
horizontal +  and erect +
0.1 cm1 mm <br />0.001 m <br /> (?) +  and 0.8 cm8 mm <br />0.008 m <br /> (?) +
connate +  and distinct +
stipitate-glandular +
Boykinia turbinata +, Saxifraga aconitifolia +, Therofon aconitifolium +  and Therofon turbinatum +
Boykinia aconitifolia +
Boykinia +
species +
crenate +  and serrate +
not stoloniferous +  and rhizomatous +
annual +, biennial +  and perennial +