Jepson eFlora: Taxon page
Vascular Plants of California
Key to families | Table of families and genera
Previous taxon Index to accepted names and synonyms:
| A | B | C | D | E | F | G | H | I | J | K | L | M |
| N | O | P | Q | R | S | T | U | V | W | X | Y | Z |
Next taxon


Petrophytum


Higher Taxonomy
Family: RosaceaeView DescriptionDichotomous Key

Common Name: ROSE FAMILY
Habit: 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).
Genera In Family: 110 genera, +- 3000 species: worldwide, especially temperate; many cultivated for ornament, fruit, especially Cotoneaster, Fragaria, Malus, Prunus, Pyracantha, Rosa, Rubus. Note: Number of teeth is per leaf or leaflet, not per side of leaf or leaflet, except in Drymocallis.
eFlora Treatment Author: Daniel Potter & Barbara Ertter, family description, key to genera, treatment of genera by Daniel Potter, except as noted
Scientific Editor: Daniel Potter, Thomas J. Rosatti.
Petrophytum
Habit: 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.
Species In Genus: +- 4 species: western North America. Etymology: (Greek: rock pl)
Jepson eFlora Author: Daniel Potter & Thomas J. Rosatti
Index of California Plant Names (ICPN; linked via the Jepson Online Interchange)

Previous taxon: Peraphyllum ramosissimum
Next taxon: Petrophytum caespitosum

Name Search

Please use this Google Form for Contact/Feedback

Citation for this treatment: Daniel Potter & Thomas J. Rosatti 2012, Petrophytum, in Jepson Flora Project (eds.) Jepson eFlora, https://ucjeps.berkeley.edu/eflora/eflora_display.php?tid=88863, accessed on April 24, 2024.

Citation for the whole project: Jepson Flora Project (eds.) 2024, Jepson eFlora, https://ucjeps.berkeley.edu/eflora/, accessed on April 24, 2024.