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. shockleyi S. Watson var. shockleyi

Plant matted, green; caudex much-branched
Stem spreading, < 15 cm
Leaf generally 2–8 cm; sheathing bases strigose; leaflets generally 5–10 per side, lobes 3–5, 1–5 mm, oblanceolate to obovate; cauline leaf 1, generally ± bract-like
Inflorescence open, generally < 10-flowered; pedicels 4–10 mm, S-shaped in fruit
Flower 5–10 mm wide; hypanthium length 1/2 width; petals ± 2 mm, oblanceolate, yellow, < or = sepals; stamens 5; pistils 2–5(6)
Fruit ± 2 mm, smooth, light brown
Ecology: Rocky areas
Elevation: 2700–4000 m.
Bioregional distribution: n&c High Sierra Nevada, White and Inyo Mountains
Distribution outside California: se Oregon, c&n Nevada
Flowering time: May–Jul
I. cryptocaulis (Clokey) D.D. Keck (sw NV) has open, buried caudex
Horticultural information: DRN, IRR, SUN: 1, 2, 3, 16, 17; DFCLT.