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.

IVESIA

Barbara Ertter

Perennial, glandular; odor resinous
Leaves generally basal, odd-1-pinnate, generally ± cylindric; cauline reduced; leaflets generally overlapped, generally divided ± to base
Inflorescence: cyme
Flower: hypanthium shallow or deep; bractlets (0)5, generally < sepals; sepals generally 5; petals generally 5, acute to rounded; stamens generally < or = 20; pistils 1–many, ovaries superior, style jointed below fruit tip, base ± rough-thickened
Fruit: achene
Species in genus: 30 species: w North America
Etymology: (E. Ives, Yale Univ. pharmacologist, 1779–1861)
Reference: [Ertter 1989 Syst Bot 14:231–244]
Lf and leaflet data are for basal leaves.

Native

I. unguiculata A. Gray

YOSEMITE IVESIA

Plant rosetted, silvery- to gray-hairy; caudex generally simple
Stem ascending, generally 10–30 cm
Leaf 7–15 cm; sheathing bases glabrous; leaflets generally 15–25 per side, lobes 3–8, generally 3–5 mm, linear to oblanceolate; cauline leaves 3–6
Inflorescence: clusters 1–several, ± 10 mm wide, head-like, generally < 10-flowered; pedicels < 3 mm, straight
Flower 6–9 mm wide; hypanthium length ± = width; petals 3–4 mm, ± obovate, white or pink-tinged, > sepals; stamens 10–15; pistils 3–9
Fruit ± 1.5 mm, smooth, light brown
Ecology: Meadows
Elevation: 1500–2500 m.
Bioregional distribution: c&s High Sierra Nevada
Horticultural information: In cultivation.