Potentilla sect. Biflorae

(Rydberg) O. Stevens in N. L. Britton et al.

in N. L. Britton et al., N. Amer. Fl. 22(7): 11. 1959.

Basionym: Biflorae Rydberg Bull. Torrey Bot. Club 24: 13. 1897
Synonyms: Potentilla ser. Biflorae (Rydberg) Soják Potentilla subg. Micropogon Bunge
Treatment appears in FNA Volume 9. Treatment on page 130. Mentioned on page 124, 131.

Perennials, tufted, not stoloniferous; taproots not fleshy-thickened; vestiture of long and crisped hairs, glands absent or sparse, not red. Stems ± erect, not flagelliform, not rooting at nodes, lateral to persistent basal rosettes, (0.1–) 0.5–1 (–1.5) dm, lengths 1.5–3 times basal leaves. Leaves: basal sometimes 2-ranked; cauline leaves 0 (–1); primary leaves ternate, appearing ± palmate, 2–7 cm; petiole: long hairs absent or spreading to ascending, weak, glands usually absent; leaflets 3, at tip of leaf axis, separate, cuneate-ovate in outline, margins strongly revolute, central leaflets divided nearly to base into 3 equal lobes, lateral divided nearly to base into 2 lobes, lobes entire, rarely again 2-fid, surfaces ± dissimilar, abaxial whitish with thick waxy bloom, cottony hairs absent, adaxial light green, often purple-tinged, not glaucous, long hairs weak or absent. Inflorescences solitary flowers or 2–3 (–4) -flowered, ± cymose, open. Pedicels straight in fruit, 0.5–1.5 (–2) cm, proximal not much longer than distal. Flowers 5-merous; hypanthium 2–2.5 mm diam.; petals pale-yellow to yellow, ± obcordate, 6–10 mm, longer than sepals, apex retuse; stamens ca. 20; styles subapical, filiform-tapered, not papillate-swollen proximally, 2.5–4 mm. Achenes smooth.

Distribution

nw North America, Asia

Discussion

Species 1.

Although sect. Biflorae deviates from the main body of Potentilla and superficially resembles the mainly Asian genus Dasiphora in shoot and leaf architecture and in some floral features, molecular analyses place the species unequivocally in the Potentilla clade, not in the Fragaria clade with Dasiphora (C. Dobeš and J. Paule 2010; M. H. Töpel et al. 2011).

Selected References

None.

Lower Taxa

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

... more about "Potentilla sect. Biflorae"
purple-tinged +  and light green +
Reidar Elven +, David F. Murray +  and Barbara Ertter +
(Rydberg) O. Stevens in N. L. Britton et al. +
compound +  and simple +
Biflorae +
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 />) +
ceraceous +
reduced +
free +  and distinct +
hairy +  and glabrous +
nw North America +  and Asia +
not +  and aggregated +
5-merous +, open +, cymose +  and 2-3(-4)-flowered +
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 />) +
stoloniferous +  and short-rhizomatous +
straight +
spreading to ascending +
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 />) +
0.2 cm2 mm <br />0.002 m <br /> (0.25 cm2.5 mm <br />0.0025 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 open +  and more or less congested +
crassinucellate +
bipinnate +, odd-pinnate +, subpalmate +, palmate +  and ternate +
opposite +  and alternate +
marcescent +
well-developed +
persistent +
cauline +  and basal +
reduced +
cuneate-ovate +
palmate +  and pinnate +
revolute toothed +  and divided +
inferior +  and superior +
clustered +, biseriate +  and superposed +
1.5 cm15 mm <br />0.015 m <br /> (2 cm20 mm <br />0.02 m <br />) +
0.5 cm5 mm <br />0.005 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
free +  and distinct +
0.6 cm6 mm <br />0.006 m <br /> (1 cm10 mm <br />0.01 m <br />) +
adnate +, free +, connate +  and distinct +
palmate +  and ternate +
2 cm20 mm <br />0.02 m <br /> (7 cm70 mm <br />0.07 m <br />) +
in N. L. Britton et al., N. Amer. Fl. +
not arillate +
persistent +
free +  and distinct +
erect +  and spreading +
lanceolate +  and broadly ovate or deltate +
free +  and distinct +
not rooting +
reddish +  and green +
1.5-3 times basal leaves +
1 +  and many +
not flagelliform +
palmate +  and pinnate +
deciduous +
distinct +
subapical +
papillate-swollen +  and filiform-tapered +
rough-thickened +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
Potentilla ser. +  and Potentilla subg. Micropogon +
not fleshy-thickened +
Potentilla sect. Biflorae +
Potentilla +
section +
inconspicuous +
enlarged +
biennial +, annual +  and perennial +
herb +  and matted +