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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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.


Thomas J. Rosatti

Shrub, unarmed
Leaves elliptic to (ob)ovate, generally serrate, deciduous; stipules generally 0; petiole 0–short
Inflorescence: raceme or panicle, many-flowered, bracted; bractlet generally 1 at top of pedicel, generally linear
Flower: hypanthium obconic to bell-shaped; sepals spreading to erect; petals spreading, white to rose; stamens 15–many; pistils 5, opposite petals, free or fused at base, surrounded by hypanthium, ovaries superior, styles ± terminal, beak-like in fruit, stigmas head-like
Fruit: follicles 5, dehiscent along inner suture and top of outer
Seeds ± fusiform; coats membranous
Species in genus: ± 50 species: n temp
Etymology: (Greek: shrub)
Reference: [Henrickson 1985 Aliso 11:199–211]


S. densiflora Torr. & A. Gray

Plant 2–9 dm, glabrous to finely and sparsely hairy
Leaf generally 1–7 cm; petiole < 3 mm; blade surfaces similar
Inflorescence generally wider than long, ± flat-topped
Flower: hypanthium 2–2.5 mm; sepals ± 1 mm, spreading to erect; petals ± 1.5 mm, rose
Ecology: Moist, rocky areas including serpentine, coniferous forests
Elevation: 600–3400 m.
Bioregional distribution: Klamath Ranges, Cascade Range, High Sierra Nevada
Distribution outside California: to British Columbia
Plants with young herbage finely hairy have been called subsp. splendens (Baumann) Abrams
Horticultural information: IRR, DRN: 1, 4, 5, 6, 17 &SHD: 2, 7, 14, 15, 16, 18, 19, 20, 21.

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bioregional map for SPIRAEA%20densiflora being generated
YOU CAN HELP US make sure that our distributional information is correct and current. If you know that a plant occurs in a wild, reproducing state in a Jepson bioregion NOT highlighted on the map, please contact us with that information. Please realize that we cannot incorporate range extensions without access to a voucher specimen, which should (ultimately) be deposited in an herbarium. You can send the pressed, dried collection (with complete locality information indicated) to us (e-mail us for details) or refer us to an accessioned herbarium specimen. Non-occurrence of a plant in an indicated area is difficult to document, but we will especially value your input on those types of possible errors (see automatic conversion of distribution data to maps).

Retrieve Jepson Interchange Index to Plant Names entry for Spiraea densiflora
Retrieve dichotomous key for Spiraea
Overlay Consortium of California Herbaria specimen data by county on this map
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