Book  (1944)  Page(s) 462.  Includes photo(s).
 
Rosa pisocarpa A. Gray. Mortar or Cluster Rose. Fig. 2510.
Rosa pisocarpa A. Gray, Proc. Amer. Acad. 8: 382. 1872.
Rosa Copelandii Greene, Leaflets Bot. Obs. 2: 264. 1912.
Rosa Pringlei Rydb. Bull. Torrey Club 44: 79. 1917.
Rosa Eastwoodiae Rydb. N. Amer. Fl. 22: 527. 1918.

Stems slender, 1-2 m. high, armed with weak infrastipular prickles, the floral branches sometimes unarmed. Stipules densely short pubescent, slightly glandular-dentate; leaflets usually glabrous; hypanthium smooth, globose, about 8 mm. broad in fruit; sepals caudate-attenuate, often foliaceous, glandular-shipi on the back. In moist placed, Transition Zone; British Columbia to Idaho and Northern California. Type locality: Oregon. May.- Aug. In the northern Sierra Nevada and the Sisiyou Mountains are a series of forms that seem to show hybridization or intergradation between the southern R. californica, the northwestern R. pisocarpa and the interior or Great Basis R. ultramontana.

Book  (1944)  Page(s) 463.  Includes photo(s).
 
Rosa rivalis Eastw. Brook Rose. Fig. 2514.
Rosa rivalis Eastw. Bull. Torrey Club 32: 198. 1905.

Stems about 1 m. high, glabrous, armed with scattering slender straight prickles. Stipules glabrous ; rachis and petioles glabrous or slightly pubescent ; leaflets 5-7, broadly oval, 2-5 cm. long, coarsely toothed, thin, glabrous or sparsely pubescent on the veins beneath; flowers corymbose; hypanthium globose; sepals 1.5-2 cm. long, usually with dilated tips, sparingly glandular on the back; petals about 2 cm. long.
Transition Zone; southern Oregon to central California. Type locality: Laytonville, Mendocino County, California. June-July.

Book  (1940)  Page(s) 441.  
 
R. pisocarpa A. Gr. Shrub to 2 m.; stems slender, with weak slender usually ascending prickles 2-5 mm. long: lfts. 5-7, elliptic-oblong to oblong-obovate, 1-4 cm. long, acutish or obtuse, coarsely serrate, green and finely pubescent beneath, short petioluled; upper stipules dilated, slightly glandular-dentate: fls. corymbose with leafy bracts, pink, about 3 cm. across; sepals glandular-hispid on back: fr. globose, sometimes with short neck, 8 mm. across. Fl. VI-VIII. B.M.6857(c). W.R.227,t(c). B. C. to Calif. and Idaho. Intr. about 1882. Zone V.

Book  (1939)  Page(s) 184.  Includes photo(s).
 
Rosa pisocarpa Gray. Cluster Rose. Fig. 197.
A slender shrub, 3 to 6 feet high, armed with few slender straight prickles, or rarely unarmed. Leaflets 5 or 7, oval, ½-inch to 1½ long, glabrous and geeen above, paler and finely puberulentor rarely glabrous beneath, finely serrate. Flowers in coryms or rarely solitary, conspiciously leafy-bracted; pedicels glabrous; sepals prolonged into a slender terminal linear or lanceolate appendage, usually glandular-hispid; petals obcordate, ½ to 2/3 inches long; hypanthium globose, glabrous. Flowering period, June to August.
Cluster Rose occurs on shaded hill alopes of the North Coast Ranges from Northern Lake and Mendocino counties northward to Del Norte, Trinity, and Siskiyou counties, in the Transition Life Zone. It extends northward to Oregon.
Rosa pisocarpa Gray, Proc. Am. Acad. 8:382 (1872). Type locality: "Oregon." Collected by Elihu Hall. R. pisocarpa var. rivalis (Eastw.) Jepson.

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.
 

Website/Catalog  (1938)  Page(s) 49.  
 
Hybrid Musk, Bourbon, Gallica, and other types
Pisocarpa... Pink, in corymbs, blooming through several months. Slender, upright growths, with few prickles.

Book  (1937)  Page(s) 76.  
 
pisocarpa A. Gray (Cinn. - America) [ploidy] 14

Website/Catalog  (1923)  Page(s) 53.  
 
Rosa pisocarpa (Gray, 1872). Purple-pink.

Book  (1919)  Page(s) 438-439.  
 
R. PISOCARPA, A. Gray.
(Bot. Mag., t. 6857.)
A small shrub, usually not more than 3 to 4 ft. high, of rather straggling habit ; branches slender, unarmed, or with a few small prickles, either straight or pointing upwards. Leaves 2 to 3 ins. long, with five or seven leaflets, which are ½ to 1 in. long, oval or ovate, simply toothed, and, like the common stalk, downy beneath. Flowers 1 in. or rather more across, with rounded, overlapping, bright rosy petals ; they occur in clusters of as many as four or five, but are sometimes solitary ; stalk smooth ; sepals ½ in. or more long with expanded tips, very downy within. Fruit about the size of a pea, globose, bright red, surmounted by the erect sepals.
Native of Western N. America. An interesting and brightly coloured rose, distinct in the tiny fruits.

Book  (20 Feb 1912)  Page(s) No. 233, p. 71.  
 
Seeds and plants imported during the period from January 1 to March 31, 1911:
...Rosa pisocarpa Gray. Distribution.- Northwestern America, from Briish Columbia southward to Oregon and Nevada.