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Vascular Plants of California
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Rosa bridgesii
SIERRAN DWARF ROSE


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 ornamental, 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.
Genus: RosaView DescriptionDichotomous Key


Habit: Shrub to vine, often thicket-forming, generally prickly. Leaf: generally odd-pinnately compound; stipules generally attached to petiole, generally gland-margined. Inflorescence: generally +- cyme or flowers 1; pedicel bractlets 0. Flower: hypanthium urn-shaped, bractlets 0; sepals often with long expanded tip; petals generally 5 (except cultivated), generally pink in California (white to red or yellow); stamens generally > 20; pistils generally many, ovaries superior, styles attached at tip, generally hairy. Fruit: bony achenes generally enclosed in fleshy, generally +- red hypanthium (hip).
Species In Genus: 100+ species: generally northern temperate. Etymology: (Latin: ancient name) Note: Species hybridize freely; other non-natives established locally. FNANM treatment by Lewis & Ertter uses both subspecies and varieties, the latter mostly reserved for localized variants within a subspecies; 2 varieties in Rosa woodsii subsp. gratissima treated here but not in TJM2 (2012).
eFlora Treatment Author: Barbara Ertter
Reference: Ertter & Lewis 2008 Madroño 55:170--177
Unabridged Reference: Lewis & Ertter 2007 Novon 17:342--353
Rosa bridgesii Crép. ex Rydb.
NATIVE
Habit: Dwarf shrub, openly rhizomed, generally 1--4(8) dm. Stem: prickles few, generally paired, 3--10 mm, +- thick-based, straight. Leaf: axis glabrous to finely hairy, glandular; leaflets generally 5--7, +- hairy, glandular; terminal leaflet generally 10--30(50) mm, generally widely obovate (elliptic), widest above middle, tip generally +- truncate, margins double-toothed, glandular. Inflorescence: 1--2(7)-flowered; pedicels 4--17 mm, glabrous and glandless to +- glandular. Flower: hypanthium +- 3--4 mm wide at flower, glabrous, generally glandless, neck 1.5--3 mm wide; sepals glandular, margins entire, tip generally < body, entire; petals 10--20 mm, pink to red; pistils generally 10--30. Fruit: 7--14 mm wide, +- ovoid; sepals erect, persistent; achenes 4--6.5 mm. Chromosomes: 2n=14,28.
Ecology: Open forest, rocky areas; Elevation: 700--2500 m. Bioregional Distribution: CaR, SN; Distribution Outside California: southern Oregon. Flowering Time: May--Aug
Synonyms: Rosa crenulata Greene; Rosa gymnocarpa Nutt. var. pubescens S. Watson; Rosa yainacensis Greene
Unabridged Note: Replaces references to Rosa pinetorum in SN; proposed for conservation (Ertter 2007 Taxon 56:962--964). See ICPN for nomenclatural problems.
Jepson eFlora Author: Barbara Ertter
Reference: Ertter & Lewis 2008 Madroño 55:170--177
Index of California Plant Names (ICPN; linked via the Jepson Online Interchange)

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Botanical illustration including Rosa bridgesii

botanical illustration including Rosa bridgesii

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Citation for this treatment: Barbara Ertter 2014, Rosa bridgesii, in Jepson Flora Project (eds.) Jepson eFlora, Revision 2, https://ucjeps.berkeley.edu/eflora/eflora_display.php?tid=41653, accessed on January 23, 2021.

Citation for the whole project: Jepson Flora Project (eds.) 2021, Jepson eFlora, https://ucjeps.berkeley.edu/eflora/, accessed on January 23, 2021.

Rosa bridgesii
click for enlargement
© 2009 Keir Morse
Rosa bridgesii
click for enlargement
© 2009 Keir Morse
Rosa bridgesii
click for enlargement
© 2009 Keir Morse
Rosa bridgesii
click for enlargement
© 2009 Keir Morse
Rosa bridgesii
click for enlargement
© 2009 Barry Breckling

More photos of Rosa bridgesii in CalPhotos



Geographic subdivisions for Rosa bridgesii:
CaR, SN
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map of distribution 1
(Note: any qualifiers in the taxon distribution description, such as 'northern', 'southern', 'adjacent' etc., are not reflected in the map above, and in some cases indication of a taxon in a subdivision is based on a single collection or author-verified occurence).





 

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Data provided by the participants of the  Consortium of California Herbaria.
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All markers link to CCH specimen records. The original determination is shown in the popup window.
Blue markers indicate specimens that map to one of the expected Jepson geographic subdivisions (see left map). Purple markers indicate specimens collected from a garden, greenhouse, or other non-wild location.
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CCH collections by month

Duplicates counted once; synonyms included.
Species do not include records of infraspecific taxa, if there are more than 1 infraspecific taxon in CA.
Blue line denotes eFlora flowering time (fruiting time in some monocot genera).