Potentilla basaltica

Tiehm & Ertter

Brittonia 36: 228, fig. 1. 1984.

Common names: Soldier Meadow or Black Rock cinquefoil
Conservation concernEndemic
Treatment appears in FNA Volume 9. Treatment on page 176. Mentioned on page 167, 168, 169.

Plants ± rosetted; taproots fleshy-thickened. Stems ± prostrate, sometimes ascending in supporting vegetation, 1.5–5 dm, lengths 2–3 times basal leaves. Basal leaves pinnate with distal leaflets ± confluent, 5–12 (–18) × 1–1.5 (–2) cm; petiole 0.5–1 (–1.5) cm, straight hairs absent, cottony hairs absent, glands absent or sparse; primary lateral leaflets (5–) 10–15 (–20) per side, on nearly whole leaf axis, ± overlapping, largest ones (or leaflet lobes) elliptic, 0.4–1 (–2) × 0.2–0.5 (–1) cm, simple and entire or 2 (–3) -fid to base (sometimes shallowly toothed as well), segments 1–2 (–3), narrowly to broadly elliptic, 4–10 (–20) × (1–) 2–3 mm, apical tufts absent or less than 0.5 mm, surfaces green, glaucous, straight hairs absent or sparse to common, tightly appressed, 0.5 mm or less, stiff, cottony hairs absent, glands absent or sparse. Cauline leaves 2–4. Inflorescences (5–) 10–20-flowered, loosely cymose. Pedicels 0.8–3 (–4) cm, straight to ± recurved in fruit. Flowers: epicalyx bractlets lanceolate-elliptic to ovate-elliptic, 1.5–2.5 (–3) × 1 mm; hypanthium 2–5 mm diam.; sepals (3–) 4–5 (–6) mm, apex acute to acuminate; petals (3.5–) 4.5–6.5 × 2.5–4 mm; filaments 1.5–3 mm, anthers 0.6–0.8 mm; carpels 3–10, styles 2–2.5 mm. Achenes 1.8–2.2 mm, smooth to ± rugose, not carunculate.


Phenology: Flowering late spring–summer.
Habitat: Moist, subalkaline meadows in shrub steppe
Elevation: 1300–1600 m

Discussion

Of conservation concern.

Potentilla basaltica is very distinctive in its glaucous, highly divided cylindric leaves with leaflets arranged in four ranks. The leaves strongly resemble those of some species of Ivesia, especially I. kingii S. Watson, but molecular analysis (B. Ertter et al. 1998) confirms a relationship with other members of sect. Multijugae.

Potentilla basaltica is known from only two localities, one in Lassen County, California, and the other in Humboldt County, Nevada. Both populations are highly localized, and P. basaltica is a candidate for federal listing as well as of conservation concern in both states.

The epithet basaltica was chosen as a reference to the Black Rock Desert, not habitat.

Selected References

None.

Lower Taxa

None.

"less" is not a number."dm" is not declared as a valid unit of measurement for this property.

... more about "Potentilla basaltica"
not carunculate +
smooth +  and more or less rugose +
1.8mm +  and 2.2mm +
0.06 cm0.6 mm <br />6.0e-4 m <br /> (0.08 cm0.8 mm <br />8.0e-4 m <br />) +
Barbara Ertter +
Tiehm & Ertter +
compound +  and simple +
12 cm120 mm <br />0.12 m <br /> (18 cm180 mm <br />0.18 m <br />) +
1.5 cm15 mm <br />0.015 m <br /> (2 cm20 mm <br />0.02 m <br />) +
5 cm50 mm <br />0.05 m <br /> (12 cm120 mm <br />0.12 m <br />) +
1 cm10 mm <br />0.01 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
Multijugae +
25 cm250 mm <br />0.25 m <br /> (30 cm300 mm <br />0.3 m <br />) +
less cordate or reniform +  and narrowly elliptic +
0.5 cm5 mm <br />0.005 m <br /> (25 cm250 mm <br />0.25 m <br />) +
reduced +
free +  and distinct +
hairy +  and glabrous +
Soldier Meadow or Black Rock cinquefoil +
Calif. +  and Nev. +
not +  and aggregated +
1300–1600 m +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
lanceolate-elliptic +  and ovate-elliptic +
1 cm10 mm <br />0.01 m <br /> (?) +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
0.8 cm8 mm <br />0.008 m <br /> (2 cm20 mm <br />0.02 m <br />) +
unisexual +  and bisexual +
not +  and aggregated +
deciduous +
on style scar +, hairy +  and glabrous +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.26 cm2.6 mm <br />0.0026 m <br />) +
Moist, subalkaline meadows in shrub steppe +
stoloniferous +  and short-rhizomatous +
straight +
sparse +  and dense +
spreading +  and more or less appressed +
sparse +  and common +
crisped +
not differentiated +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
0.7 cm7 mm <br />0.007 m <br /> (1 cm10 mm <br />0.01 m <br />) +
0.2 cm2 mm <br />0.002 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
0.2 cm2 mm <br />0.002 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
cymose +  and (5-)10-20-flowered +
crassinucellate +
bipinnate +, odd-pinnate +, subpalmate +, palmate +  and ternate +
opposite +  and alternate +
marcescent +
well-developed +
persistent +
cauline +  and basal +
reduced +
not +  and overlapping +
oblanceolate +  and obovate oblong cuneate flabellate or elliptic +
linear +  and oblanceolate +
palmate +  and pinnate +
revolute toothed +  and divided +
inferior +  and superior +
clustered +, biseriate +  and superposed +
3 cm30 mm <br />0.03 m <br /> (4 cm40 mm <br />0.04 m <br />) +
0.8 cm8 mm <br />0.008 m <br /> (3 cm30 mm <br />0.03 m <br />) +
0.35 cm3.5 mm <br />0.0035 m <br /> (0.45 cm4.5 mm <br />0.0045 m <br />) +
1 cm10 mm <br />0.01 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
free +  and distinct +
0.45 cm4.5 mm <br />0.0045 m <br /> (0.65 cm6.5 mm <br />0.0065 m <br />) +
0.4 cm4 mm <br />0.004 m <br /> (1 cm10 mm <br />0.01 m <br />) +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
1 cm10 mm <br />0.01 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
0.5 cm5 mm <br />0.005 m <br /> (1 cm10 mm <br />0.01 m <br />) +
Flowering late spring–summer. +
adnate +, free +, connate +  and distinct +
1 cm10 mm <br />0.01 m <br /> (2 cm20 mm <br />0.02 m <br />) +
0.5 cm5 mm <br />0.005 m <br /> (1 cm10 mm <br />0.01 m <br />) +
0.4 cm4 mm <br />0.004 m <br /> (1 cm10 mm <br />0.01 m <br />) +
0.2 cm2 mm <br />0.002 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
20 cm200 mm <br />0.2 m <br /> (32 cm320 mm <br />0.32 m <br />) +
2 cm20 mm <br />0.02 m <br /> (20 cm200 mm <br />0.2 m <br />) +
often not much longer +
not arillate +
1 cm10 mm <br />0.01 m <br /> (2 cm20 mm <br />0.02 m <br />) +
0.1 cm1 mm <br />0.001 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
0.4 cm4 mm <br />0.004 m <br /> (1 cm10 mm <br />0.01 m <br />) +
0.2 cm2 mm <br />0.002 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
0.5 cm5 mm <br />0.005 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
persistent +
free +  and distinct +
erect +  and spreading +
lanceolate +  and broadly ovate or deltate +
0.4 cm4 mm <br />0.004 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
Conservation concern +  and Endemic +
free +  and distinct +
not rooting +
reddish +  and green +
2-3 times basal leaves +
prostrate to decumbent +
1 +  and many +
not flagelliform +
palmate +  and pinnate +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
deciduous +
distinct +
subapical +
papillate-swollen +  and filiform +
rough-thickened +
0.2 cm2 mm <br />0.002 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
Potentilla sect. Candicantes +
fleshy-thickened +
Potentilla basaltica +
Potentilla sect. Multijugae +
species +
1 +  and 5 +
inconspicuous +
enlarged +
biennial +, annual +  and perennial +