View source for Rosa bridgesii

{{Treatment/ID
|accepted_name=Rosa bridgesii
|accepted_authority=Crépin ex Rydberg
|publications={{Treatment/Publication
|title=Bull. Torrey Bot. Club
|place=44: 83. 1917
|year=1917
}}
|common_names=Sierran ground rose
|special_status={{Treatment/ID/Special_status
|code=E
|label=Endemic
}}{{Treatment/ID/Special_status
|code=F
|label=Illustrated
}}
|basionyms=
|synonyms={{Treatment/ID/Synonym
|name=Rosa gymnocarpa var. pubescens
|authority=S. Watson
|rank=variety
}} {{Treatment/ID/Synonym
|name=R. spithamea var. solitaria
|authority=L. F. Henderson
|rank=variety
}} {{Treatment/ID/Synonym
|name=R. spithamea var. subinermis
|authority=Engelmann
|rank=variety
}}
|hierarchy=Rosaceae;Rosaceae subfam. Rosoideae;Rosaceae tribe Roseae;Rosa;Rosa subg. Rosa;Rosa sect. Rosa;Rosa bridgesii
|hierarchy_nav=<div class="higher-taxa"><div class="higher-taxon"><small>family</small>[[Rosaceae]]</div><div class="higher-taxon"><small>subfamily</small>[[Rosaceae subfam. Rosoideae]]</div><div class="higher-taxon"><small>tribe</small>[[Rosaceae tribe Roseae]]</div><div class="higher-taxon"><small>genus</small>[[Rosa]]</div><div class="higher-taxon"><small>subgenus</small>[[Rosa subg. Rosa]]</div><div class="higher-taxon"><small>section</small>[[Rosa sect. Rosa]]</div><div class="higher-taxon"><small>species</small>[[Rosa bridgesii]]</div></div>
|volume=Volume 9
|mention_page=page 97, 116, 117, 119
|treatment_page=page 118
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Subshrubs,</b> forming open colonies. <b>Stems</b> erect, (1–)2–4(–8) dm, openly branched; bark often glaucous when young, gray to dark brown with age, glabrous; infrastipular prickles paired, erect, largest ± flattened, subulate, 3–10 × 2–7 mm, base glabrous, internodal rare or absent, smaller, mixed with aciculi, eglandular. <b>Leaves</b> 2.5–11 cm; stipules 5–10 × 2–4 mm, auricles flared, 1–3 mm, margins entire, usually sessile-glandular, surfaces glabrous, stipitate-glandular; petiole and rachis with sparse pricklets, glabrous or densely fine hairy hairs to 0.2 mm, densely stipitate-glandular; leaflets (3–)5–7, terminal: petiolule 3–20 mm, blade obovate or widely elliptic-cuneate to ± orbiculate, 10–30(–50) × 8–25(–30) mm, membranous to ± leathery, base rounded-obtuse, margins 2+-crenate, teeth 8–12 per side, obtuse, gland-tipped, apex obtuse to truncate, abaxial surfaces gray-green, finely puberulent, sometimes sparsely stipitate-glandular, adaxial green, dull, finely puberulent to glabrate. <b>Inflorescences</b> corymbs, 1 or 2(–7)-flowered. <b>Pedicels</b> erect, relatively slender, 5–17 mm, glabrous, eglandular or stipitate-glandular; bracts 1–3, lanceolate, 3–10 × 1–6 mm, margins entire, stipitate-glandular, surfaces glabrous, eglandular. <b>Flowers</b> 2.5–3.5 cm diam.; hypanthium ovoid-globose to widely urceolate, 4–5 × 3–4 mm, glabrous, rarely sparsely setose, usually eglandular, neck 0.5–1(–2) × 1.5–3 mm; sepals spreading, lanceolate, 6–14 × 2–3 mm, tip 0–4 × 0.5 mm, margins entire, abaxial surfaces puberulent, usually stipitate-glandular; petals single, deep pink, 10–20 × 10–20 mm; carpels 10–30, styles exsert 0.5–1 mm beyond stylar orifice (1–1.5 mm diam.) of hypanthial disc (2–4 mm diam.). <b>Hips</b> scarlet, ovoid to depressed-globose to pyriform, (8–)10–18 × 7–14 mm, fleshy, glabrous, rarely sparsely setose distally, eglandular, neck 1 × 2.5–4.5 mm; sepals persistent, erect. <b>Achenes</b> basiparietal, 1–11, cream to pale brown, 3.5–5(–6.5) × 2.5–4 mm. <b>2n</b> = 14, 28.</span><!--

-->{{Treatment/Body
|phenology=Flowering May–Aug.
|habitat=Open forest floors, meadow edges, rocky outcrops, midmontane forests, shade to sun
|elevation=700–2500 m
|distribution=Calif.;Oreg.
|discussion=<p>As here circumscribed, <i>Rosa bridgesii</i> is the Sierran-Cascade counterpart of <i>R. spithamea</i>, encompassing previous references to <i>R. pinetorum</i> and <i>R. spithamea</i> from the Sierra <i>Nevada</i> and most applications of R. yainacensis. The species is the low-growing, openly rhizomatous rose of midmontane forests in the Sierra <i>Nevada</i> and southern Cascade Range of California and Oregon. Finely puberulent leaflets help distinguish non-fruiting <i>R. bridgesii</i> from sympatric <i>R. gymnocarpa</i>, which has glabrous leaflets. Plants from Oregon differ from Sierran plants in that prickles are less likely to be infrastipular only.</p><!--
--><p>In the phylogenetic analysis by A. Bruneau et al. (2007), <i>Rosa bridgesii</i> and <i>R. spithamea</i> comprise a distinct clade more closely related to Asian species than to others from western North America.</p><!--
--><p><i>Rosa bridgesii</i> has been conserved against R. calvaria Greene, R. covillei Greene, <i>R. crenulata</i> Greene, R. myriadenia Greene, and R. yainacensis Greene (B. Ertter 2007b). Only R. calvaria and <i>R. crenulata</i> are unambiguous synonyms of <i>R. bridgesii</i>; the taxonomic identity of the other names remains unresolved and may involve hybridization with other species.</p><!--
--><p>On the basis of pollen size, E. W. Erlanson (1931) believed that material falling within the current circumscription of <i>Rosa bridgesii</i> was tetraploid (2n = 28). In a subsequent paper (1934), she reported a diploid somatic count (2n = 14) for R. calvaria, a synonym of <i>R. bridgesii</i>. Recent flow cytometry indicates a tetraploid condition for the sampled specimen of <i>R. bridgesii</i> (A. Bruneau et al., unpubl. data). It is possible that both ploidy levels are present within the species.</p>
|tables=
|references=
}}<!--

--><!--

-->{{#Taxon:
name=Rosa bridgesii
|authority=Crépin ex Rydberg
|rank=species
|parent rank=section
|synonyms=Rosa gymnocarpa var. pubescens;R. spithamea var. solitaria;R. spithamea var. subinermis
|basionyms=
|family=Rosaceae
|phenology=Flowering May–Aug.
|habitat=Open forest floors, meadow edges, rocky outcrops, midmontane forests, shade to sun
|elevation=700–2500 m
|distribution=Calif.;Oreg.
|reference=None
|publication title=Bull. Torrey Bot. Club
|publication year=1917
|special status=Endemic;Illustrated
|source xml=https://bibilujan@bitbucket.org/aafc-mbb/fna-data-curation.git/src/bb6b7e3a7de7d3b7888a1ad48c7fd8f5c722d8d6/coarse_grained_fna_xml/V9/V9_177.xml
|subfamily=Rosaceae subfam. Rosoideae
|tribe=Rosaceae tribe Roseae
|genus=Rosa
|subgenus=Rosa subg. Rosa
|section=Rosa sect. Rosa
|species=Rosa bridgesii
}}<!--

-->[[Category:Treatment]][[Category:Rosa sect. Rosa]]