View source for Rosa pinetorum

{{Treatment/ID
|accepted_name=Rosa pinetorum
|accepted_authority=A. Heller
|publications={{Treatment/Publication
|title=Muhlenbergia
|place=1: 53. 1904
|year=1904
}}
|common_names=Pine rose
|special_status={{Treatment/ID/Special_status
|code=C
|label=Conservation concern
}}{{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 gymnocarpa var. pinetorum
|authority=(A. Heller) Jepson
}}
|hierarchy=Rosaceae;Rosaceae subfam. Rosoideae;Rosaceae tribe Roseae;Rosa;Rosa subg. Rosa;Rosa sect. Rosa;Rosa pinetorum
|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 pinetorum]]</div></div>
|volume=Volume 9
|mention_page=page 97, 116, 118, 119
|treatment_page=page 117
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Subshrubs,</b> forming open colonies. <b>Stems</b> erect, 1–8(–15) dm, openly branched; bark dark reddish brown, glabrous; infrastipular prickles single or paired, erect, subulate, 3–10 × 0.5–1.5 mm, base glabrous, internodal prickles dense, smaller, sometimes mixed with aciculi. <b>Leaves</b> (2–)3.5–7(–8.5) cm; stipules 5–10(–30) × 2–5 mm, auricles slightly flared, 1–3 mm, margins entire, sometimes stipitate-glandular, surfaces glabrous, eglandular; petiole and rachis usually with pricklets, glabrous or finely hairy, stipitate-glandular; leaflets 5(–7), terminal: petiolule 5–12 mm, blade ± elliptic, 12–25(–32) × 6–15(–20) mm, membranous to ± leathery, base rounded, sometimes obtuse to cuneate, margins multi-serrate to nearly 1-serrate, teeth (5–)7–12 per side, acute to obtuse, usually gland-tipped, apex obtuse to rounded, abaxial surfaces ± pale green, glabrous or sparsely hairy, glandular, adaxial green, dull, glabrous. <b>Inflorescences</b> corymbs, 1–5(+)-flowered. <b>Pedicels</b> erect, mostly slender, 2–20(–35) mm, glabrous or sparsely hairy, sometimes stipitate-glandular; bracts 1–3, lanceolate or ovate-lanceolate, 6–25 × 2–7 mm, margins entire or serrate, short stipitate-glandular, surfaces glabrous or sparsely pubescent, glandular. <b>Flowers</b> 2–4 cm diam.; hypanthium ovoid to depressed-globose, 3.5–4 × 3.5–4 mm, glabrous, eglandular, neck 0.5 × 2.5–3.5 mm; sepals spreading to reflexed, ovate-lanceolate, 7–12 × 3 mm, tip 2–8 × 0.5–2 mm, margins entire or slightly toothed, abaxial surfaces finely hairy, stipitate-glandular, sometimes eglandular; petals single, deep pink, 10–20 × 10–20 mm; carpels 10–40, styles exsert 1.5 mm beyond stylar orifice (1.5–2 mm diam.) of hypanthial disc (3.5–5 mm diam.). <b>Hips</b> scarlet, subglobose to ovoid, 10 × 10–12 mm, fleshy, glabrous, eglandular, neck 1 × 4–5 mm; sepals persistent, erect. <b>Achenes</b> basiparietal, 1–10, pale tan, 3–4 × 2.5–3 mm. <b>2n</b> = 14.</span><!--

-->{{Treatment/Body
|phenology=Flowering May–Jun.
|habitat=Seasonally moist areas, openings in pine forests
|elevation=0–200 m
|distribution=Calif.
|discussion=<p>Of conservation concern.</p><!--
--><p>The present circumscription of <i>Rosa pinetorum</i>, restricted to the central California coast, is narrower than that of historical usage (for example, W. L. Jepson 1909–1943, vol. 2; L. Abrams and R. S. Ferris 1923–1960, vol. 2; P. A. Munz 1959), in which the name was applied to dwarf roses throughout the Coast Ranges and Sierra <i>Nevada</i> of California that lacked the conspicuous stipitate hypanthial glands that characterize <i>R. spithamea</i>. Here, the Sierra <i>Nevada</i> populations are treated as <i>R. bridgesii</i>.</p><!--
--><p>Coast Range populations are more problematic; the eglandular characteristic occurs sporadically throughout the range of <i>Rosa spithamea</i>, possibly as a result of hybridization with other species; R. F. Hoover (1966) called such plants forma pinetorum (A. Heller) Hoover. Here, however, the epithet is restricted to relatively uniform populations occurring on coastal terraces in open forests of <i>Pinus muricata</i> and <i>P. radiata</i> on the Monterey Peninsula in central California. Given that these populations are well removed from the nearest known populations of <i>R. spithamea</i> and that Monterey Peninsula has other highly localized endemic species, <i>R. pinetorum</i> is tentatively retained as a distinct species. Plants assigned to this reduced circumscription clustered with <i>R. gymnocarpa</i> in a molecular phylogenetic analysis (A. Bruneau et al. 2007); whether this is indicative of close relationship or introgression is unresolved.</p><!--
--><p>Based on pollen size and shape from the type specimen of <i>Rosa pinetorum</i>, E. W. Erlanson (1931) concluded that it is tetraploid (2n = 28). This is consistent with flow cytometry data, which indicated either triploid or tetraploid status (A. Bruneau et al., unpubl.), but not with chromosome counts using the same plant, which clearly showed a diploid 2n = 14 (D. Zlesak and W. H. Lewis, unpubl.). Erlanson (1934) used the name R. yainacensis to encompass <i>R. pinetorum</i> in the strict sense and putatively tetraploid populations from Fort Ross, California, distinct from the diploid R. calvaria, a synonym of <i>R. bridgesii</i>.</p>
|tables=
|references=
}}<!--

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-->{{#Taxon:
name=Rosa pinetorum
|author=
|authority=A. Heller
|rank=species
|parent rank=section
|synonyms=Rosa gymnocarpa var. pinetorum
|basionyms=
|family=Rosaceae
|phenology=Flowering May–Jun.
|habitat=Seasonally moist areas, openings in pine forests
|elevation=0–200 m
|distribution=Calif.
|reference=None
|publication title=Muhlenbergia
|publication year=1904
|special status=Conservation concern;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_175.xml
|subfamily=Rosaceae subfam. Rosoideae
|tribe=Rosaceae tribe Roseae
|genus=Rosa
|subgenus=Rosa subg. Rosa
|section=Rosa sect. Rosa
|species=Rosa pinetorum
}}<!--

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