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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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.

PETROPHYTON

ROCK SPIRAEA

Thomas J. Rosatti

Shrub, matted, scapose
Leaves crowded, evergreen, generally ± oblanceolate, entire
Inflorescence ± spike-like
Flower: bractlets on hypanthium 0; sepals persistent; petals white; stamens 20–40; pistils generally 5, simple, ovary superior, hairy, styles thread-like
Fruit: follicles, dehiscing along both sutures
Seeds 1–several, linear
Species in genus: ± 4 species: w North America
Etymology: (Greek: rock plant)

Native

P. caespitosum (Nutt.) Rydb.

Plant 3–8 dm wide; rosettes many
Stems very stout
Leaf 1–3-veined below
Inflorescence 4–14 cm; peduncle 3–10 cm, bracted
Flower: sepals ± 1.5 mm, narrowly ovate, acute; petals ± 1.5 mm, generally obtuse; style ± 3 mm
Fruit ± 2 mm
Seeds 1–2, ± 1.5 mm, linear to obovoid, brown, smooth
Ecology: Limestone soils, pinyon/juniper woodland, coniferous forest
Elevation: 1200–3000 m.
Bioregional distribution: s High Sierra Nevada, White and Inyo Mountains, Desert Mountains
Distribution outside California: to Rocky Mtns

Native

subsp. acuminatum (Rydb.) Munz


Leaf 10–18 mm, sparsely hairy
Ecology: Limestone cliffs, coniferous forest
Elevation: 1200–2300 m.
Bioregional distribution: s High Sierra Nevada
Horticultural information: TRY; DFCLT.

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bioregional map for PETROPHYTON%20caespitosum%20subsp.%20acuminatum 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 Petrophyton caespitosum subsp. acuminatum
Retrieve dichotomous key for Petrophyton
Overlay Consortium of California Herbaria specimen data by county on this map
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