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'Cluster Rose' References
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.
 
Book  (1937)  Page(s) 76.  
 
pisocarpa A. Gray (Cinn. - America) [ploidy] 14
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.
Book  (1909)  Page(s) 211, Vol. 2.  
 
R. pisocarpa Gray. Cluster Rose.
Slender, 3 to 5 feet high; prickles few, slender and straight, or none; leaves green and glabrous [smooth] above, paler and often puberulent [covered with fine down] beneath, not glandular, leaflets finely serrate; stipules strongly and often abrupty dilated upwards...; flowers in corymbs or solitary; ...hips globose.
Rich hill slopes and vally or cañon flats, 50 to 3000 feet: Lake, Humboldt and Trinity County to Shasta, Siskiyou and Del Norte Counties, North to British Columbia.
June - August.
Book  (1900)  Page(s) 351.  
 
Rosa pisocarpa. (Botanical Magazine t.6857.) Hardy. A species with reddish glabrous stems armed with straight prickles. Leaf rather small, with five leaflets. Flowers 2-3 together, bright pink, about 1 in. in diam. Fruit globose, reddish, 1/3-1/2 in. in diam. North California.
Article (magazine)  (1897)  Page(s) 152-153.  
 
R. pisocarpa A. Gr.

a. Feuille. — Poils simples sur les deux épidermes, surtout sur l'inférieur. Poils glandulifères nuls. Épiderme supérieur reclicurviligne, d'une épaisseur de 19-23 μ, à cellules petites. Épiderme inférieur d'une épaisseur de 10-16 μ, à cellules moyennes ou petites, rarement grandes. Stomates d'une longueur de 25-26 μ, plus petits que les cellules environnantes ou au plus égaux à elles. Mésophylle bifacial, d'une épaisseur de 62-73 μ, composé de 5-6 assises, les 2-3 supérieures transformées en palissades remplissant 1/2-3/4 de l'épaisseur totale. Parenchyme spongieux peu ou pas lacuneux. Faisceaux libéro-ligneux des nervures et du pétiolule ordinairement sans fibres péridesmiques. Péliole renfermant à sa base 3-5 fais- ceaux disposés en arc.

b. Tige. — Cuticule épaisse. Parenchyme cortical composé de 14 15 assises de cellules étroites et allongées tangentiellement. Bois très vasculaires, vaisseaux étroits. Moelle à cellules moyennes ou petites.
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