View source for Rosa blanda

{{Treatment/ID
|accepted_name=Rosa blanda
|accepted_authority=Aiton
|publications={{Treatment/Publication
|title=Hort. Kew.
|place=2: 202. 1789
|year=1789
}}
|common_names=Meadow or smooth rose;rosier inerme
|special_status={{Treatment/ID/Special_status
|code=E
|label=Endemic
}}{{Treatment/ID/Special_status
|code=F
|label=Selected by author to be illustrated
}}
|basionyms=
|synonyms={{Treatment/ID/Synonym
|name=Rosa johannensis
|authority=Fernald
}} {{Treatment/ID/Synonym
|name=R. rousseauiorum
|authority=B. Boivin
}} {{Treatment/ID/Synonym
|name=R. subblanda
|authority=Rydberg
}} {{Treatment/ID/Synonym
|name=R. williamsii
|authority=Fernald
}}
|hierarchy=Rosaceae;Rosaceae subfam. Rosoideae;Rosaceae tribe Roseae;Rosa;Rosa subg. Rosa;Rosa sect. Rosa;Rosa blanda
|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 blanda]]</div></div>
|volume=Volume 9
|mention_page=page 77, 95, 100, 104
|treatment_page=page 105
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Shrubs,</b> forming thickets. <b>Stems</b> erect or arching, (5–)10–20 dm, sparsely branched; bark green when young, red to orange-red with age, proximally glaucous, glabrous; infrastipular prickles absent, internodal prickles rare, sparse, distal aciculi rare. <b>Leaves</b> 8.5–11 cm; stipules (9–)15–25 × 4–6 mm, auricles usually flared, (2.5–)4–6 mm, margins entire or serrate, sparsely to densely stipitate-glandular, surfaces glabrous, sometimes pubescent, eglandular or glandular; petiole and rachis with pricklets rare or absent, glabrous or puberulent to pubescent, sessile- or stipitate-glandular, sometimes eglandular; leaflets 5–7(–9), terminal: petiolule 5–9(–13) mm, blade elliptic or ovate, sometimes obovate, (15–)25–40(–55) × (8–)12–20(–30) mm, membranous, margins 1-serrate, teeth 10–26 per side, acute, sometimes black gland-tipped, apex acute, sometimes obtuse, abaxial surfaces pale green, glabrous, sometimes pubescent or tomentulose, eglandular, adaxial green, dull to ± lustrous, glabrous, sometimes marginally hairy. <b>Inflorescences</b> corymbs, 1–5(–10)-flowered. <b>Pedicels</b> erect, slender, 14–25 mm, glabrous, eglandular, rarely sparsely stipitate-glandular; bracts 1 or 2, ovate-lanceolate, 14–20 × 2–8 mm, margins entire, sometimes undulate, irregularly serrate, short stipitate-glandular, surfaces glabrous, glandular. <b>Flowers</b> 3–6(–7) cm diam.; hypanthium ovoid or globose, 4–5 × 4.5–5 mm, glabrous, eglandular, rarely stipitate-glandular, neck (0–)0.5–0.8 × 3–3.5 mm; sepals usually erect usually forming a beak-cap or ± reflexed, ovate-lanceolate, (12–)20–30 × 2.5–3.5 mm, tip 2.5–4 × 0.5–1.5 mm, margins entire or pinnatifid, abaxial surfaces glabrous, stipitate-glandular, rarely eglandular; petals single, pink or rose, 13–26 × 12–26 mm; stamens 115; carpels 32–55, styles exsert 1–2 mm beyond stylar orifice (1.5 mm diam.) of hypanthial disc (4 mm diam.). <b>Hips</b> red, subglobose to globose, sometimes ellipsoid, urceolate, or pyriform, 8–11 × 8–11 mm, fleshy, glabrous, eglandular, rarely sparsely stipitate-glandular, neck (0–)0.5–1(–1.5) × 3.5–4.5 mm; sepals persistent, erect or reflexed. <b>Achenes</b> basiparietal, 26, tan, 3.5–4 × 1.5–3 mm. <b>2n</b> = 14.</span><!--

-->{{Treatment/Body
|phenology=Flowering Jun–Jul.
|habitat=Thickets, grassy verges, edges of woods, ditches, stream banks, gravelly and sandy flats
|elevation=0–700 m
|distribution=Man.;N.B.;N.W.T.;N.S.;Ont.;Que.;Sask.;Ill.;Ind.;Iowa;Maine;Mass.;Mich.;Minn.;Mo.;Nebr.;N.H.;N.Y.;N.Dak.;Ohio;Pa.;R.I.;S.Dak.;Vt.;W.Va.;Wis.;introduced in c Europe.
|discussion=<p><i>Rosa blanda</i> is best recognized by its erect, slender distal stems and branches without armature or, rarely, with internodal prickles and/or aciculi. In addition, auricles are flared, 4–6 mm; abaxial surfaces of sepals are stipitate-glandular, usually forming an erect beak-cap, and an average stamen number of 115, nearly double that of <i>R. woodsii</i> with 65.</p><!--
--><p>M. Mercure and A. Bruneau (2008) described and genetically confirmed spontaneous hybrids between <i>Rosa blanda</i> and <i>R. rugosa</i> forming colonies along the St. Lawrence Estuary, Quebec. Analyses indicated that most of the hybrids were first generation; second generation and backcrosses were also detected. This is a recently established hybrid zone with the potential for introgression of the aggressive <i>R. rugosa</i> into native <i>R. blanda</i> and thereby a serious threat to the integrity of the native species.</p><!--
--><p>A. Bruneau et al. (2007) found that, within <i>Rosa blanda</i>, previously recognized segregate species (R. johannensis, R. rousseauiorum, R. subblanda, R. williamsii) should not be considered specifically distinct from <i>R. blanda</i>, although populations representing R. williamsii might be worthy of subspecific recognition.</p>
|tables=
|references=
}}<!--

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-->{{#Taxon:
name=Rosa blanda
|author=
|authority=Aiton
|rank=species
|parent rank=section
|synonyms=Rosa johannensis;R. rousseauiorum;R. subblanda;R. williamsii
|basionyms=
|family=Rosaceae
|phenology=Flowering Jun–Jul.
|habitat=Thickets, grassy verges, edges of woods, ditches, stream banks, gravelly and sandy flats
|elevation=0–700 m
|distribution=Man.;N.B.;N.W.T.;N.S.;Ont.;Que.;Sask.;Ill.;Ind.;Iowa;Maine;Mass.;Mich.;Minn.;Mo.;Nebr.;N.H.;N.Y.;N.Dak.;Ohio;Pa.;R.I.;S.Dak.;Vt.;W.Va.;Wis.;introduced in c Europe.
|reference=None
|publication title=Hort. Kew.
|publication year=1789
|special status=Endemic;Selected by author to be illustrated
|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/f6b125a955440c0872999024f038d74684f65921/coarse_grained_fna_xml/V9/V9_153.xml
|subfamily=Rosaceae subfam. Rosoideae
|tribe=Rosaceae tribe Roseae
|genus=Rosa
|subgenus=Rosa subg. Rosa
|section=Rosa sect. Rosa
|species=Rosa blanda
}}<!--

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