Jepson Flora Project: Jepson Interchange    

 
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Jepson Interchange (more information)
©Copyright 1993 by the Regents of the University of California

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  • Up-to-date information about California vascular plants is available from the Jepson eFlora.

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. kingii S. Watson var. kingii

ALKALI IVESIA

Plant rosetted, glabrous or short-appressed-hairy, glaucous or not; caudex generally simple
Stem decumbent to ascending, 15–40 cm
Leaf 7–15 cm; sheathing bases generally strigose; leaflets 30–50 per side, overlapped but distinct, lobes < 4, 2–6 mm, oblanceolate to obovate; cauline leaves 4–13
Inflorescence open; clusters generally < 10, 10–20 mm wide, loosely head-like, generally < 5-flowered; pedicels 3–25 mm, straight
Flower ± 10 mm wide; hypanthium length ± 1/2 width; petals 3–5 mm, ± obovate, white, > sepals; stamens 20; pistils 2–6
Fruit 2–2.5 mm, smooth, light brown
Ecology: Moist alkaline clay
Elevation: 1200–2000 m.
Bioregional distribution: n East of Sierra Nevada (Mono Co.)
Distribution outside California: to Utah
Flowering time: Jun–Jul
Var. eremica (Coville) Ertter, Ash Meadows mousetails, w NV, has branched caudex, denser hairs, more tightly overlapped leaflets.
See the CNPS Inventory for information about endangerment and rarity.
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bioregional map for IVESIA%20kingii%20var.%20kingii being generated
 


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