Potentilla sect. Chrysanthae

(Th. Wolf) Juzepczuk in V. L. Komarov et al.

in V. L. Komarov et al., Fl. URSS 10: 180. 1941.

Basionym: Chrysanthae Th. Wolf in P. F. A. Ascherson et al., Syn. Mitteleur. Fl. 6(1): 671, 775. 1904
Treatment appears in FNA Volume 9. Treatment on page 146. Mentioned on page 125, 151, 189.

Perennials, rosetted or tufted, not stoloniferous; taproots not fleshy-thickened; vestiture mostly of long hairs (and crisped hairs in inflorescence), glands absent or sparse to abundant, sometimes red (P. rubella). Stems ascending to erect, not flagelliform, not rooting at nodes, lateral to persistent basal rosettes, (0.2–) 1–5 (–7) dm, lengths usually 2–5 times basal leaves, rarely shorter than leaves. Leaves: basal not in ranks; cauline 1–3; primary leaves palmate, 3–25 (–35) cm; petiole: long hairs spreading to appressed, weak to stiff, glands absent or sparse to common; leaflets (4–) 5–11, at tip of leaf axis, ± overlapping or not, narrowly oblanceolate or oblanceolate-elliptic to obovate, margins flat, distal 1/2–3/4+ evenly incised 1/4–1/3 (–1/2) to midvein, teeth 1–10 (–13) per side, or distal 1/4 or less incised less than 1/10 (–1/4) to midvein, teeth 1–2 (–5) per side (P. stipularis), surfaces ± similar, green to pale green or reddish, sometimes glaucous, long hairs absent or weak to stiff, cottony hairs absent. Inflorescences (1–) 2–20-flowered, usually cymose, open. Pedicels usually ± straight in fruit, sometimes ± curved (P. thuringiaca), 1–3 (–6) cm, proximal often much longer than distal. Flowers: 5-merous; hypanthium 2.5–5 mm diam.; petals yellow, ± obcordate, (4–) 5–10 mm, longer than sepals, apex retuse; stamens ca. 20; styles subapical, ± columnar, rarely columnar-filiform, to tapered, not or ± papillate-swollen proximally, 0.7–1.3 mm. Achenes smooth to faintly rugose.

Distribution

n North America, Eurasia

Discussion

Species ca. 8 (3 in the flora).

Selected References

None.

Key

1 Cauline leaves: stipules fused with less than 1/3 of petiole, free portion longer than fused portion; basal leaves: distal 2/3–3/4+ of leaflet margins with (4–)6–10(–13) teeth per side; petiole hairs ± spreading, 1–2.5 mm; introduced; Quebec and Rhode Island. Potentilla thuringiaca
1 Cauline leaves: stipules fused with all or most of petiole, free portion shorter than fused portion; basal leaves: distal 1/10–1/2 or less of leaflet margins with 1–2(–5) teeth per side; petiole hairs absent or appressed to spreading, 0.5–1.5 mm; native; Alaska and Greenland > 2
2 Leaflets 7–11, margins incised in distal 1/4 or less; glands mostly absent. Potentilla stipularis
2 Leaflets (4–)5(–6), margins incised in distal ± 1/2; glands sparse to abundant (especially on pedicels, epicalyx bractlets, and sepals). Potentilla rubella

"thin" is not a number."dm" is not declared as a valid unit of measurement for this property."-5timesbasalleaves" is not declared as a valid unit of measurement for this property."dm" is not declared as a valid unit of measurement for this property."dm" is not declared as a valid unit of measurement for this property.

smooth +  and faintly rugose +
Reidar Elven +, Barbara Ertter +  and James L. Reveal +
(Th. Wolf) Juzepczuk in V. L. Komarov et al. +
compound +  and simple +
opposite +  and alternate +
Chrysanthae +
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 />) +
coriaceous +
reduced +
free +  and distinct +
hairy +  and glabrous +
n North America +  and Eurasia +
not +  and aggregated +
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 />) +
sparse;common +
stoloniferous +  and short-rhizomatous +
straight +
weak +  and stiff +
spreading +  and appressed +
weak to stiff +
crisped +
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 />) +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
0.5mm;2.5mm +
turbinate +, patelliform +  and cupulate +
open +, cymose +  and (1-)2-20-flowered +
crassinucellate +
bipinnate +, odd-pinnate +, subpalmate +, palmate +  and ternate +
opposite +  and alternate +
marcescent +
well-developed +
persistent +
cauline +  and basal +
reduced +
not +  and overlapping +
oblanceolate-elliptic +  and obovate +
linear +  and oblanceolate +
palmate +  and pinnate +
1/4 (?) +  and 1/3-1/2 (?) +
inferior +  and superior +
clustered +, biseriate +  and superposed +
3 cm30 mm <br />0.03 m <br /> (6 cm60 mm <br />0.06 m <br />) +
curved +  and straight +
1 cm10 mm <br />0.01 m <br /> (3 cm30 mm <br />0.03 m <br />) +
0.4 cm4 mm <br />0.004 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
free +  and distinct +
obcordate +
0.5 cm5 mm <br />0.005 m <br /> (1 cm10 mm <br />0.01 m <br />) +
adnate +, free +, connate +  and distinct +
25 cm250 mm <br />0.25 m <br /> (35 cm350 mm <br />0.35 m <br />) +
3 cm30 mm <br />0.03 m <br /> (25 cm250 mm <br />0.25 m <br />) +
in V. L. Komarov et al., Fl. URSS +
not arillate +
persistent +
free +  and distinct +
erect +  and spreading +
lanceolate +  and broadly ovate or deltate +
free +  and distinct +
not rooting +
reddish +  and green +
ascending +  and erect +
1 +  and many +
not flagelliform +
palmate +  and pinnate +
linear;ovate +
deciduous +
distinct +
subapical +
papillate-swollen +, rarely columnar-filiform +  and tapered +
rough-thickened +
0.07 cm0.7 mm <br />7.0e-4 m <br /> (0.13 cm1.3 mm <br />0.0013 m <br />) +
green +  and pale green or reddish +
not fleshy-thickened +
Potentilla sect. Chrysanthae +
Potentilla +
section +
1 (?) +  and 2 (?) +
incised +
inconspicuous +
enlarged +
tufted +  and rosetted +
biennial +, annual +  and perennial +
herb +  and matted +