Potentilla hickmanii

Eastwood

Bull. Torrey Bot. Club 29: 77. 1902.

Common names: Hickman’s cinquefoil
Conservation concernEndemic
Treatment appears in FNA Volume 9. Treatment on page 174. Mentioned on page 169, 175.

Plants ± rosetted; taproots fleshy-thickened. Stems usually prostrate to decumbent, sometimes ± ascending in supporting vegetation, 0.5–2.5 dm, lengths 1–2 times basal leaves. Basal leaves pinnate with distal leaflets ± confluent, 3–17 × 1–3.5 cm; petiole 1–5 cm, straight hairs sparse to common, appressed, 0.5–1.5 (–2) mm, stiff, cottony hairs absent, glands absent or sparse; primary lateral leaflets 3–6 per side, on distal 1/2–2/3 of leaf axis, ± overlapping to nearly separate, largest ones cuneate to flabellate, 0.5–2 × 0.5–1.5 cm, distal 1/2 to whole margin ± palmately incised 1/2–2/3 (+) to midvein, ultimate teeth or segments 2–5, narrowly elliptic to oblanceolate, 2–10 (–15) × (1–) 1.5–3 mm, apical tufts 0.5 mm, surfaces green, not glaucous, straight hairs sparse to common (often sparser to glabrate adaxially), appressed, 1–1.5 mm, stiff, cottony hairs absent, glands absent or inconspicuous. Cauline leaves 2. Inflorescences 2–5-flowered, very openly cymose, sometimes racemiform. Pedicels 1–2 (–4) cm, ± recurved in fruit. Flowers: epicalyx bractlets ± elliptic, 3.5–6 × (1–) 1.5–2.5 mm; hypanthium 3–5 mm diam.; sepals 3.5–7 (–9) mm, apex acute; petals 6–12 × 5–9 mm; filaments (1.5–) 2–3 (–4) mm, anthers 0.7–1.2 mm; carpels (2–) 5–15, styles 2.5–3.5 mm. Achenes 2 mm, smooth, ± carunculate.


Phenology: Flowering spring–early summer.
Habitat: Vernally saturated coastal meadows, openings in Monterey Pine forests
Elevation: 30–100 m

Discussion

Of conservation concern.

Potentilla hickmanii is known from only two extant populations in Monterey and San Mateo counties. The species is a federally listed endangered species (U.S. Fish and Wildlife Service, ecos.fws.gov/docs/recovery_plan/050617a.pdf). Plants from Sonoma County formerly included in P. hickmanii now constitute P. uliginosa. Although some morphologic overlap occurs with P. millefolia, P. hickmanii generally differs in having less dissected leaflets occupying less of the leaf axis, as well as somewhat larger flowers bearing fewer carpels.

Selected References

None.

Lower Taxa

None.

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

... more about "Potentilla hickmanii"
smooth +  and faintly rugose +
0.07 cm0.7 mm <br />7.0e-4 m <br /> (0.12 cm1.2 mm <br />0.0012 m <br />) +
Barbara Ertter +
Eastwood +
compound +  and simple +
3 cm30 mm <br />0.03 m <br /> (17 cm170 mm <br />0.17 m <br />) +
1 cm10 mm <br />0.01 m <br /> (3.5 cm35 mm <br />0.035 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 +
Hickman’s cinquefoil +
not +  and aggregated +
30–100 m +
0.1 cm1 mm <br />0.001 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
0.35 cm3.5 mm <br />0.0035 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
0.3 cm3 mm <br />0.003 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
0.2 cm2 mm <br />0.002 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 />) +
inconspicuous +
Vernally saturated coastal meadows, openings in Monterey Pine forests +
stoloniferous +  and short-rhizomatous +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
straight +
sparse +  and dense +
spreading +  and more or less appressed +
sparse +  and common +
crisped +
0.1 cm1 mm <br />0.001 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
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 />) +
0.3 cm3 mm <br />0.003 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 />) +
racemiform +, cymose +  and 2-5-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 +
inferior +  and superior +
clustered +, biseriate +  and superposed +
2 cm20 mm <br />0.02 m <br /> (4 cm40 mm <br />0.04 m <br />) +
1 cm10 mm <br />0.01 m <br /> (2 cm20 mm <br />0.02 m <br />) +
1 cm10 mm <br />0.01 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
free +  and distinct +
0.6 cm6 mm <br />0.006 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
0.4 cm4 mm <br />0.004 m <br /> (1 cm10 mm <br />0.01 m <br />) +
0.5 cm5 mm <br />0.005 m <br /> (0.9 cm9 mm <br />0.009 m <br />) +
1 cm10 mm <br />0.01 m <br /> (5 cm50 mm <br />0.05 m <br />) +
Flowering spring–early summer. +
adnate +, free +, connate +  and distinct +
less overlapping +  and nearly separate +
1 cm10 mm <br />0.01 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
0.1 cm1 mm <br />0.001 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
0.2 cm2 mm <br />0.002 m <br /> (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 />) +
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 +
Bull. Torrey Bot. Club +
not arillate +
0.7 cm7 mm <br />0.007 m <br /> (0.9 cm9 mm <br />0.009 m <br />) +
persistent +
free +  and distinct +
erect +  and spreading +
lanceolate +  and broadly ovate or deltate +
0.35 cm3.5 mm <br />0.0035 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
Conservation concern +  and Endemic +
free +  and distinct +
not rooting +
reddish +  and green +
1-2 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 +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
not glaucous +
Potentilla sect. Candicantes +
fleshy-thickened +
Potentilla hickmanii +
Potentilla sect. Multijugae +
species +
1 +  and 5 +
inconspicuous +
enlarged +
biennial +, annual +  and perennial +