TREATMENT FROM THE JEPSON MANUAL	previous taxon | next taxon Jepson Interchange (more information)
	©Copyright 1993 by the Regents of the University of California Print edition is available from the University of California Press

	The second edition of The Jepson Manual (2012) is available from the University of California Press
	See also the Jepson eFlora, which parallels the Second Edition

ROSACEAE

ROSE FAMILY

Annual to tree
Leaves simple to pinnately to palmately compound, generally alternate; stipules free to fused, persistent to deciduous
Inflorescence: cyme, raceme, panicle, or flowers solitary
Flower generally bisexual, radial; hypanthium free or fused to ovary, saucer- to funnel-shaped, often with bractlets alternate with sepals; sepals generally 5; petals generally 5, free; stamens (0)5–many, pistils (0)1–many, simple or compound; ovary superior to inferior, styles 1–5
Fruit: achene, follicle, drupe, pome, or blackberry- to raspberry-like
Seeds generally 1–5
Genera in family: 110 genera, ± 3000 species: worldwide, especially temp. Many cultivated for ornamental and fruit, especially Cotoneaster , Fragaria , Malus , Prunus , Pyracantha, Rosa , and Rubus
Reference: [Robertson 1974 J Arnold Arbor 55:303–332,344–401,611–662]
Family description, key to genera by Barbara Ertter and Dieter H. Wilken.

POTENTILLA

CINQUEFOIL

Barbara Ertter

Annual to shrub; odor resinous or 0
Leaves generally basal, odd-1-pinnate to 1-palmate or 1-ternate; leaflets ± toothed or lobed, terminal generally ± = lateral
Inflorescence: cyme, generally ± open; pedicels generally ± straight
Flower: hypanthium ± shallow; bractlets 5; sepals generally 5, ± triangular; petals generally 5, generally = or > sepals, generally ± widely obcordate, generally yellow; stamens generally 20; pistils generally many, styles generally jointed near tip
Fruit: achene
Species in genus: 200–500 species: n temp
Etymology: (Latin: diminutive of powerful, for reputed medicinal value)
Reference: [Clausen, Keck, & Hiesey 1940 Carn Inst Wash Pub 520:26–195]
P. anglica Laicharding is a waif from cultivated: stem trailing; pedicels 2–8 cm, slender; sepals and petals generally 4; leaflets 3–5.

Native

P. drummondii Lehm.

Plant ± tufted from few-branched caudex; glands generally 0 or hidden
Stem decumbent to ± erect, generally 10–60 cm, glabrous to cottony
Leaves pinnate to subpalmate; basal generally 3–25 cm, leaflets 2–9 per side, separated or overlapped, 5–50 mm, oblanceolate to obovate, toothed to lobed, glabrous to densely hairy
Inflorescence generally < 20-flowered
Flower: hypanthium 3–6 mm wide; petals 5–10 mm; filaments 1–4 mm, anthers 0.7–1 mm; styles 2–3 mm, slender
Fruit 1.5–2 mm, smooth, ± brown
Chromosomes: 2n=64–108,129
Ecology: Meadows, rocks
Elevation: 1100–3700 m (highest in SN).
Bioregional distribution: Klamath Ranges, High Cascade Range, High Sierra Nevada, Warner Mountains
Distribution outside California: w N.America
May hybridize with P. diversifolia , P. gracilis , P. wheeleri ; subspp. poorly defined.

Native

subsp. bruceae (Rydb.) D.D. Keck

Leaves: basal subpalmate; petiole generally > blade, generally densely straight- or shaggy-hairy; leaflets ± 3 per side, ± overlapped, generally 15–25 mm, pinnately toothed ± 1/2 to midvein (sometimes also split to base), generally gray-hairy
Chromosomes: 2n=±64–98,129
Ecology: Habitats of sp.
Elevation: 1200–3700 m.
Bioregional distribution: Klamath Ranges, High Cascade Range, High Sierra Nevada, Warner Mountains
Distribution outside California: Oregon
Horticultural information: TRY.