Potentilla supina
Potentilla morefieldii
bushy cinquefoil, spreading cinquefoil
Morefield's cinquefoil
0.4–1.5(–1.7) dm, lengths 2–3 times basal leaves.
pinnate, usually at least 2 pairs of leaflets separate from terminal leaflets, distal leaflets usually distinct, 2–6 cm;
petiole 0.2–1.5 cm, straight hairs abundant, ± appressed, 1–1.5 mm, stiff, cottony hairs absent, glands absent or sparse;
leaflets 5–9, on distal (1/4–)1/2–3/4+ of leaf axis, overlapping, proximal pair separated from others by 2–10 mm of leaf axis, central leaflets oblanceolate to narrowly obovate, (0.5–)1–2(–2.5) × 0.5–1.2 cm, petiolules 0–1 mm, distal 3/4 of margins incised 3/4 to midvein (sometimes medially cleft as well), teeth 3–4 per side, separate to slightly overlapping, (1–)2–5 mm, surfaces ± to strongly dissimilar, abaxial grayish to white, straight hairs ± abundant, ± appressed, 1 mm, weak to stiff (especially on veins), cottony hairs abundant to dense, glands absent or obscured, adaxial greenish to grayish, straight hairs ± abundant, appressed, 0.5–1.5 mm, stiff, cottony hairs absent, rarely sparse, glands sparse.
3–15-flowered.
1–2.5(–3) cm.
epicalyx bractlets ± ovate-elliptic, 2–4 × 0.8–2 mm;
hypanthium 2.5–5 mm diam.;
sepals 3.5–5 mm, apex ± acute;
petals 4–6 × 3–5 mm;
filaments 1–2 mm, anthers 0.5–1 mm;
carpels 15–20, styles 2 mm.
1.5–2 mm, smooth to faintly rugose.
Potentilla supina
Potentilla morefieldii
Subspecies 7 (1 in the flora).
The status of Potentilla supina in North America is open to question, given the otherwise Eurasian and northern African distribution of the species and ease of transport by migratory waterfowl. Although North American material has commonly been treated as a distinct species (P. paradoxa), E. Hultén and M. Fries (1986) went so far as to consider P. supina introduced in North America. The use of subspecies within a broadly defined P. supina follows J. Soják (1987, 1993) and is also adopted by A. Kurtto et al. (in J. Jalas et al. 1972+, vol. 13).
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Of conservation concern.
Potentilla morefieldii is known only from the White Mountains and adjacent Sierra Nevada. Plants with similar aspect but lacking strigose vestiture occur in White Pine County, Nevada; their disposition is uncertain. Potentilla morefieldii is sometimes confused with P. breweri (sect. Multijugae), but the latter differs in having more or less similar leaflet surfaces with cottony hairs nearly as abundant adaxially as abaxially. Potentilla breweri also lacks the stiff adaxial leaflet hairs that characterize most species in sect. Concinnae, including P. morefieldii.
W. L. Jepson (1909–1943, vol. 2) misapplied the name Potentilla pseudosericea var. grandiflora Th. Wolf, which is a synonym of an unresolved species from the Rocky Mountains (B. Ertter 1992; Ertter et al. 2013), to P. morefieldii.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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