Website/Catalog  (2018)  
 
Rosa pinetorum A. Heller, Muhlenbergia. 1: 53. 1904.
Pine rose
Rosa gymnocarpa Nuttall var. pinetorum (A. Heller) Jepson
Description...
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.).

Article (newsletter)  (Aug 2014)  Page(s) 4.  
 
Rosa pinetorum, on the other hand, found under Monterey pines, bears a glabrous receptacle, that is, one without hairs.....
Could Rosas spithamea, pinetorum, and bridgesii, all three ground roses and genetically tetraploid, be subspecies of R. gymnocarpa, a diploid? Possibly. According to rose species authority Cassandra Bernstein, “Widely distributed diploid plant species that spread into extreme environments”— and R. gymnocarpa can be found from the understory of redwoods to the understory of oaks, from the Sierra Nevada foothills to the Pacific coast —“have been known to mutate, evolve, or hybridize into different ploidies than those commonly reported.” Surely, then, the three ground rose species may be the same rose whose ecogeographic variations have created variations in the species.

Website/Catalog  (2008)  
 
Check the New York Botanical Garden website for two outstanding large, pressed specimen of Rosa pinetorum A. Heller.

Article (website)  (2001)  
 
Barbara Ertter's Native California Roses notes that Rosa pinetorum is differentiated from Rosa bridgesii, a similar species now thought to be restricted to the Sierra Nevada. Pinetorum is not thicket-forming, usually appearing as solitary canes in the understory. Blooms in clusters of 2 to 5. Hips round.

Book  (1981)  Page(s) 276-277.  
 
R. pinetorum Heller. Shrub 0.5-1 m./1.7-3.3 ft. high, stems slender, upright, with straight, teret prickles, shoots often bristly; stipules pilose and glandularbeneath, rachis pilose and glandular; leaflets 5-7, broadly elliptic, 1-3 cm./0.4-1.2 in. long, pilose and glandular beneath, densely serrate, teeth gland-tipped, pedicels bald; flowers 4 cm./1.6 in. across, deep rose, petals obovate, May-July; fruit 12 mm./0.5 in. thick. AFP 2504. California; open woodland. May not be in cultivation now.

Book  (1944)  Page(s) 459, vol. 2.  Includes photo(s).
 
Rosa pinetorum Heller. Pine Rose. Fig. 2504. Rose pinetorum Heller...Rosa Brownii Rydg....Rosa gymnocarpa var. pinetorum Jepson....
Stems erect, slender, .05-1 m. high, armed with straight usually terete prickles, the sterile shoots also often bristly. Leaves 5-7 foliate; stipule pilose and glandular on the back; rachis and petioles glandular and pilose; leaflets broadly oval, 1-3 cm. long, pilose and glandular beneath, doubly serrate with gland-tipped teeth; pedicels glabrous; petals broadly obovate, about 2-3 cm. long; fruit about 12 mm. in diameter. Open woods, Transition Zone; Shasta County to Monterey County, and central Sierra Nevada, California....
Rosa Durandii Crépin...1875...A little-known species, Queen Charlotte Island, Davidson 8144, and Oregon, Elihu Hall 146. Type locality: Oregon, without definite locality.

Book  (1944)  Page(s) 459.  Includes photo(s).
 
Rosa pinetorum Heller. Pine Rose. Fig. 2504.
Rosa pinetorum Heller, Muhlenbergia 1 : 53. 1904.
Rosa Brownii Rydb. Bull. Torrey Club 44: 70. 1917.
Rosa gymnocarpa var. pinetorum Jepson, Man. Fl. PI. Calif. 500. 1925.

Stems erect, slender, 0.5-1 m. high, armed with straight usually terete prickles, the sterile shoots also often bristly. Leaves 5-7-foliolate; stipules pilose and glandular on the back; rachis and petioles glandular and pilose ; leaflets broadly oval, 1-3 cm. long, pilose and glandular beneath, doubly serrate with gland-tipped teeth ; pedicels glabrous ; petals broadly obovate, about 2-3 cm. long ; fruit about 12 mm. in diameter.
Open woods, Transition Zone; Shasta County to Monterey County, and central Sierra Nevada, California. Type locality: Monterey, California. May-July.

 

Book  (1939)  Page(s) 183.  
 
Rosa pinetorum Heller. Pine Rose. Fig. 194. A slender low sparingly branched shrub, ¾-foot to 2½ feet high, usually armed with numerous bristles, and slender straight prickles. Leaflets 5 to 7, roundish or oval, ⅜-inch to 1¼ inches long, nearly glabrous above, slightly pubescent and glandular on the veins beneath, doubly or singly serrate with gland-tipped teeth; petioles and rachieses usually glandular; stipules conspicuously glandular. Flowers usually solitary; pedicels glandular-hispid, bristly, or glabrous; sepals glandular on the back; petals obcordate, about ¾-inch long; hypanthium globose, not glandular-hispid or prickly. Flowering period, May to July. Pine rose occurs in the pine wood in the vicinity of Monterey Bay and in the Sierra Nevada from Tulare County northward to Shasta County, in the Transition and lower part of the Canadian Life Zones. In general habit of growth this species is easily confused with R. gymnocarpa from which is can be distinguished by the persistent calyx on the fruit.

Book  (1939)  Page(s) 183.  
 
Rosa pinetorum Heller. Pine Rose. Fig. 194.
A slender low sparingly branched shrub, ¾-foot to 2½ feet high, usually armed with numerous bristles and slender straight prickles. Leaflets 5 to 7, roundish or oval, 3/8-inch to 1¼ inches long, nearly glabrous above, slightly pubescent and glandular on the veins beneath, doubly or singly serrate with gland-tipped teeth; petioles and rachises usually glandular; stipules conspiciously glandular. Flowers usually solitary; pedicels glandular-hispid, bristly, or glabrous; sepals glandular on the back; petals obcordate, about ¾-inch long; hypanthium globose, not glandular-hispid or prickly. Flowering period, May to July.
Pine Rose occurs in the pine woods in the vicinity of Monterey Bay and in the Sierra Nevada from Tulare County northward to Shasta County, in the Transition and lower part of the Canadian Life Zones. In general habit of growth this species is easily confused with R. gymnocarpa from which it can be distinguished by the persistent calyx on the fruit.
Rosa pinetorum Heller, Muhlenbergia 1:53 (1904). Type locality: Pacific Grove, Monterey County, California. Collected by Heller.

Book  (1939)  Page(s) 179, 181.  
 
Key to the Species
Sepals, styles and upper part of the hypanthium persistent on the fruit; pistils numerous.
- Hypanthium normally smooth and glabrous.
-- Stems with slender straight (or nearly so) prickles.
--- Stipules, petioles, and rachises copiously glandular; leaflets with gland-tipped teeth....5. R. pinetorum.
--- Stipules, petioles, and rachises not conspiciously glandular.
---- Sepals usually without broad foliaceous tips.
----- Sepals decidely glandular....6. R. pisocarpa.
----- Sepals not glandular.
------ Flowers usually several in a cluster; leaflets pubescent beneath....7. R. ultramontana.
------ Flowers solitary or 2 or 3 in a cluster; leaflets glabrous on both surfaces, sometimes glaucous beneath....8. R. mohavensis.
---- Sepals normally with broad foliaceous tips....4. R. californica segregates.