Jepson Flora Project: Jepson Interchange    

 
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Jepson Interchange (more information)
©Copyright 1993 by the Regents of the University of California
For up-to-date information about California vascular plants, visit 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.

ROSA

Barbara Ertter

Shrub to vine, often thicket-forming, generally prickly
Leaves generally odd-pinnately compound; stipules generally attached to petiole, generally gland-margined
Inflorescence: generally ± cyme or flowers solitary
Flower: hypanthium urn-shaped; bractlets 0; sepals 5, often with long expanded tip; petals generally 5 (except cultivars), generally pink in CA (white to red or yellow); stamens generally > 20; pistils generally many, ovaries superior, jointed to generally hairy styles
Fruit: bony achenes enclosed in fleshy, generally reddish hypanthium (hip)
Species in genus: 100+ species: generally n temp
Etymology: (Latin: ancient name)
Spp. hybridize freely; other non-natives established locally.

Native

R. pinetorum A. Heller

PINE ROSE

Dwarf shrub, generally < 10 dm, ± rhizomed
Stem gray-brown; prickles generally many, both slender and ± thick-based, straight
Leaf: leaflets glabrous to hairy; terminal leaflet ± 10–40 mm, generally ± elliptic, tip ± obtuse, margins ± single- or double-toothed, ± glandular
Inflorescence generally 1–5-flowered; pedicels generally 10–30 mm, glabrous to glandular
Flower: hypanthium generally ± 4 mm wide at flower, glabrous, neck ± 3 mm wide; sepals generally ± glandular, entire, tip generally ± = body, entire or toothed; petals ± 15–20 mm; pistils ± 10–20
Fruit ± 12 mm wide
Ecology: Pine woodlands, canyons
Elevation: generally < 300 m.
Bioregional distribution: west-central Central Western California. Possibly hybrids of R. spithamea , R. gymnocarpa , or others; further study essential
Horticultural information: DRN, part SHD: 4, 5 &IRR: 7, 14, 15, 16, 17, 19, 20, 21, 22, 23, 24; also STBL.
See the CNPS Inventory for information about endangerment and rarity.
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bioregional map for ROSA%20pinetorum being generated
 
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Retrieve Jepson Interchange Index to Plant Names entry for Rosa pinetorum
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