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Key to families | Table of families and genera

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ROSACEAE ROSE FAMILY

Daniel Potter & Barbara Ertter, family description, key to genera; treatment of genera by Daniel Potter, except as noted

Annual to tree, glandular or not. Leaf: simple to palmately or pinnately compound, generally alternate; stipules free to fused (0), persistent to deciduous. Inflorescence: cyme, raceme, panicle, cluster, or flowers 1; bractlets on pedicel ("pedicel bractlets") generally 0–3(many), subtended by bract or generally not. Flower: generally bisexual, radial; hypanthium free or fused to ovary, saucer- to funnel-shaped, subtending bractlets ("hypanthium bractlets") 0–5, alternate sepals; sepals generally 5; petals generally 5, free; stamens (0,1)5–many, anther pollen sacs generally 2; pistils (0)1–many, simple or compound, ovary superior to inferior, styles 1–5. Fruit: 1–many per flower, achene (fleshy-coated or not), follicle, drupe, or pome with generally papery core, occasionally drupe-like with 1–5 stones. Seed: generally 1–5 (per fruit, not per flower).
110 genera, ± 3000 species: worldwide, especially temperate; many cultivated for ornamental, fruit, especially Cotoneaster, Fragaria, Malus, Prunus, Pyracantha, Rosa, Rubus. [Potter et al. 2007 Plant Syst Evol 266:5–43] Number of teeth is per leaf or leaflet, not per side of leaf or leaflet, except in Drymocallis. —Scientific Editors: Daniel Potter, Thomas J. Rosatti.
Unabridged references: [Robertson 1974 J Arnold Arbor 55:303–332, 344–401, 611–662]

Key to Rosaceae

PETROPHYTUM

Daniel Potter & Thomas J. Rosatti

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

P. caespitosum (Nutt.) Rydb.
NATIVE
Plant 3–8 dm wide; rosettes many. Leaf: 1–3-veined abaxially. Inflorescence: 1–5 cm, dense; peduncle 3–10 cm, bracted. Flower: sepals ± 1.5 mm, narrow-ovate, acute; petals ± 1.5 mm, generally obtuse; style ± 3 mm. Fruit: ± 2 mm. Seed: 1–2, ± 1.5 mm, linear to obovoid, brown, smooth. [Petrophyton caespitosum (Nutt.) Rydb., orth. var.] [Online Interchange]

Key to Petrophytum caespitosum

P. caespitosum subsp. caespitosum
NATIVE

Limestone ledges, rocks, often in pinyon/juniper woodland; 1350–3050 m. White and Inyo Mountains, Desert Mountains; to Rocky Mountains. [Petrophyton caespitosum subsp. caespitosum, orth. var.] May–Sep [Online Interchange]

Previous taxon: Petrophytum caespitosum subsp. acuminatum
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Citation for the whole project: Jepson Flora Project (eds.) 2013. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on Jul 22 2014
Citation for this treatment: [Author of taxon treatment] 2013. Petrophytum, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=91913, accessed on Jul 22 2014

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Bioregions in which Petrophytum caespitosum subsp. caespitosum occurs Markers link to CCH specimen records. If the markers are obscured, reload the page [or change window size and reload]. Yellow markers indicate records that may provide evidence for eFlora range revision or may have georeferencing or identification issues.
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CCH collections by month

Duplicates counted once; synonyms included.
Species do not include records of infraspecific taxa.
Blue line denotes eFlora flowering time.