Rosa pinetorum

A. Heller

Muhlenbergia 1: 53. 1904.

Common names: Pine rose
Conservation concernEndemicIllustrated
Synonyms: Rosa gymnocarpa var. pinetorum (A. Heller) Jepson
Treatment appears in FNA Volume 9. Treatment on page 117. Mentioned on page 97, 116, 118, 119.

Subshrubs, forming open colonies. Stems 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. Leaves (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. Inflorescences corymbs, 1–5 (+) -flowered. Pedicels erect, mostly slender, 2–20 (–35) mm, glabrous or sparsely hairy, sometimes stipitate-glandular; bracts 1–3, lanceolate or ovatelanceolate, 6–25 × 2–7 mm, margins entire or serrate, short-stipitate-glandular, surfaces glabrous or sparsely pubescent, glandular. Flowers 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, ovatelanceolate, 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.). Hips scarlet, subglobose to ovoid, 10 × 10–12 mm, fleshy, glabrous, eglandular, neck 1 × 4–5 mm; sepals persistent, erect. Achenes basiparietal, 1–10, pale tan, 3–4 × 2.5–3 mm. 2n = 14.


Phenology: Flowering May–Jun.
Habitat: Seasonally moist areas, openings in pine forests
Elevation: 0–200 m

Discussion

Of conservation concern.

The present circumscription of Rosa pinetorum, 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 Nevada of California that lacked the conspicuous stipitate hypanthial glands that characterize R. spithamea. Here, the Sierra Nevada populations are treated as R. bridgesii.

Coast Range populations are more problematic; the eglandular characteristic occurs sporadically throughout the range of Rosa spithamea, 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 Pinus muricata and P. radiata on the Monterey Peninsula in central California. Given that these populations are well removed from the nearest known populations of R. spithamea and that Monterey Peninsula has other highly localized endemic species, R. pinetorum is tentatively retained as a distinct species. Plants assigned to this reduced circumscription clustered with R. gymnocarpa in a molecular phylogenetic analysis (A. Bruneau et al. 2007); whether this is indicative of close relationship or introgression is unresolved.

Based on pollen size and shape from the type specimen of Rosa pinetorum, 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 R. pinetorum in the strict sense and putatively tetraploid populations from Fort Ross, California, distinct from the diploid R. calvaria, a synonym of R. bridgesii.

Selected References

None.

Lower Taxa

None.

"dm" is not declared as a valid unit of measurement for this property.

... more about "Rosa pinetorum"
stipitate-glandular +, hairy +  and glabrous +
0.3 cm3 mm <br />0.003 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
basiparietal +  and basal +
2.5mm +  and 3mm +
0.1 cm1 mm <br />0.001 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
Walter H. Lewis +, Barbara Ertter +  and Anne Bruneau +
A. Heller +
dark reddish-brown +
exfoliating +
compound +  and simple +
opposite +  and alternate +
obtuse +  and cuneate +
2.5 cm25 mm <br />0.025 m <br /> (3.2 cm32 mm <br />0.032 m <br />) +
1.5 cm15 mm <br />0.015 m <br /> (2 cm20 mm <br />0.02 m <br />) +
1.2 cm12 mm <br />0.012 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
lustrous +  and dull +
orbiculate +, oblong +, ovoid +, cordate +, ovate +, obovate +, lanceolate +  and elliptic +
1 cm10 mm <br />0.01 m <br /> (3 cm30 mm <br />0.03 m <br />) +
? (?) +  and ? (?) +
6mm +  and 15mm +
persistent +
0.6 cm6 mm <br />0.006 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
ovatelanceolate +  and lanceolate +
0.2 cm2 mm <br />0.002 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
free +  and distinct +
Pine rose +
1-16(-50)-flowered +
rarely puberulent +  and tomentose +
rarely puberulent +  and tomentose +
not +  and aggregated +
0–200 m +
2 cm20 mm <br />0.02 m <br /> (4 cm40 mm <br />0.04 m <br />) +
not +  and aggregated +
eglandular +  and glandular +
urceolate +, pyriform +, oblong +, ellipsoid +, ovoid-obovoid +  and globose +
Seasonally moist areas, openings in pine forests +
1.8 cm18 mm <br />0.018 m <br /> (2.4 cm24 mm <br />0.024 m <br />) +
1.5 cm15 mm <br />0.015 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
10 cm100 mm <br />0.1 m <br /> (?) +
subglobose +  and ovoid +
1 cm10 mm <br />0.01 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
0.2 cm2 mm <br />0.002 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
conic +  and flat +
0.5 cm5 mm <br />0.005 m <br /> (1 cm10 mm <br />0.01 m <br />) +
purplish black +, purplish red +, orange-red +  and red +
0.35 cm3.5 mm <br />0.0035 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
0.2 cm2 mm <br />0.002 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
leathery +  and fleshy +
0.35 cm3.5 mm <br />0.0035 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
1-16(-50)-flowered +
crassinucellate +
3-foliate +  and compound +
7 cm70 mm <br />0.07 m <br /> (8.5 cm85 mm <br />0.085 m <br />) +
deciduous +
3.5 cm35 mm <br />0.035 m <br /> (7 cm70 mm <br />0.07 m <br />) +
leathery +  and membranous +
petiolulate +  and subsessile +
elliptic +  and obovate more or less oblong obovate-elliptic lanceolate-elliptic or obovate-oblong +
serrate +, entire +  and 1-serrate +
short-stipitate-glandular +  and stipitate-glandular +
toothed +  and entire +
multi-serrate to nearly +
distinct +
1 +  and 0.5 +
0.4 cm4 mm <br />0.004 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
inferior +  and superior +
clustered +, biseriate +  and superposed +
1-30(-50)-flowered +
setose-glandular +, sessile +, stipitate +  and eglandular +
2 cm20 mm <br />0.02 m <br /> (3.5 cm35 mm <br />0.035 m <br />) +
stipitate-glandular +, hairy +  and glabrous +
0.2 cm2 mm <br />0.002 m <br /> (2 cm20 mm <br />0.02 m <br />) +
free +  and distinct +
1 cm10 mm <br />0.01 m <br /> (2 cm20 mm <br />0.02 m <br />) +
1 cm10 mm <br />0.01 m <br /> (2 cm20 mm <br />0.02 m <br />) +
stipitate-glandular +, hairy +  and glabrous +
1.5 cm15 mm <br />0.015 m <br /> (2 cm20 mm <br />0.02 m <br />) +
0.5 cm5 mm <br />0.005 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
Flowering May–Jun. +
adnate +, free +, connate +  and distinct +
0.3 cm3 mm <br />0.003 m <br /> (1 cm10 mm <br />0.01 m <br />) +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
Muhlenbergia +
stipitate-glandular +, hairy +  and glabrous +
0.5 cm5 mm <br />0.005 m <br /> (?) +
not arillate +
3 cm30 mm <br />0.03 m <br /> (4 cm40 mm <br />0.04 m <br />) +
persistent +
free +  and distinct +
erect +, spreading +  and reflexed +
ovatelanceolate +
3 cm30 mm <br />0.03 m <br /> (?) +
rarely densely puberulent +  and tomentose +
Conservation concern +, Endemic +  and Illustrated +
free +  and distinct +
flexuous +
procumbent +  and sprawling +
1 +  and 20 +
1 cm10 mm <br />0.01 m <br /> (3 cm30 mm <br />0.03 m <br />) +
0.5 cm5 mm <br />0.005 m <br /> (1 cm10 mm <br />0.01 m <br />) +
0.2 cm2 mm <br />0.002 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
0.1 cm1 mm <br />0.001 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
persistent +
not elongate +
1.5 cm15 mm <br />0.015 m <br /> (?) +
pubescent +  and glabrous +
Rosa gymnocarpa var. pinetorum +
Rosa pinetorum +
Rosa sect. Rosa +
species +
2mm +  and 8mm +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
gland-tipped +
7 +  and 12 +
acute +  and obtuse +
inconspicuous +
enlarged +  and small +
small +  and miniature +