Potentilla sect. Brevifoliae

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

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

Basionym: Brevifoliae Rydberg Monogr. N. Amer. Potentilleae, 30. 1898
Treatment appears in FNA Volume 9. Treatment on page 187. Mentioned on page 126.

Perennials, tufted to openly matted, not stoloniferous; taproots not fleshy-thickened; vestiture of sparse long hairs, or eglandular hairs absent, glands common to abundant, red. Stems ± erect, not flagelliform, not rooting at nodes, arising laterally to persistent basal rosettes, (0.2–) 0.5–1.5 (–2.5) dm, lengths 1.5–3 (–4) times basal leaves. Leaves: basal not in ranks; cauline 0–2; primary leaves ± pinnate to subpinnate (distal leaflets ± distinct), rarely ternate, 2–7 cm; petiole: long hairs absent or spreading, weak, glands common to abundant; leaflets (3–) 5–7, on distal 1/4 or less of leaf axis, usually overlapping, ± flabellate, margins flat, ± whole length unevenly incised 1/2 to nearly to midvein into 3+ lobes these in turn incised 1/4–1/2 to midvein, primary teeth of each lobe usually 2–3, often secondarily toothed, surfaces similar, green, not glaucous, long hairs (if present) weak, cottony hairs absent. Inflorescences (1–) 3–10-flowered, ± cymose, open, or solitary flowers. Pedicels straight in fruit, 0.1–1 cm, proximal not much longer than distal. Flowers 5-merous; hypanthium 2.5–4.5 mm diam.; petals yellow, ± obcordate, 3.5–6.5 mm, longer than sepals, apex retuse; stamens ca. 20; styles subapical, filiform, ± papillate-swollen at very base, if at all, 1.4–2 mm. Achenes smooth.

Distribution

nw United States, n Mexico

Discussion

Species 3 (1 in the flora).

Section Brevifoliae is primarily based on Potentilla brevifolia, distinctive in its abundant short-septate glands and the three to seven overlapping, more or less flabellate leaflets, most often in a subpinnate arrangement. Two Mexican species, P. macdonaldii B. L. Turner and P. richardii Lehmann, are included provisionally in the section. The rounded membranous stipules suggest a close relationship with sect. Aureae, especially P. cristae, which is also abundantly glandular.

Selected References

None.

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

Barbara Ertter +  and James L. Reveal +
(Rydberg) O. Stevens in N. L. Britton et al. +
compound +  and simple +
opposite +  and alternate +
Brevifoliae +
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 +
nw United States +  and n Mexico +
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 />) +
straight +
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 /> (0.45 cm4.5 mm <br />0.0045 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 />) +
solitary +, open +, cymose +  and (1-)3-10-flowered +
crassinucellate +
bipinnate +, odd-pinnate +, subpalmate +, palmate +  and ternate +
opposite +  and alternate +
marcescent +
well-developed +
persistent +
cauline +  and basal +
reduced +
incised +  and flabellate +
linear +  and oblanceolate +
palmate +  and pinnate +
revolute toothed +  and divided +
inferior +  and superior +
clustered +, biseriate +  and superposed +
0.1 cm1 mm <br />0.001 m <br /> (1 cm10 mm <br />0.01 m <br />) +
free +  and distinct +
0.35 cm3.5 mm <br />0.0035 m <br /> (0.65 cm6.5 mm <br />0.0065 m <br />) +
adnate +, free +, connate +  and distinct +
ternate +, less pinnate +  and subpinnate +
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(-4) times basal leaves +
arising +  and erect +
1 +  and many +
not flagelliform +
palmate +  and pinnate +
deciduous +
distinct +
subapical +
papillate-swollen +  and filiform +
rough-thickened +
0.14 cm1.4 mm <br />0.0014 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
not glaucous +
not fleshy-thickened +
Potentilla sect. Brevifoliae +
Potentilla +
section +
inconspicuous +
enlarged +
incised +
biennial +, annual +  and perennial +
herb +  and matted +