Magazine  (2008)  Page(s) Vol. 22, n.3, p. 62.  
 
..I have recently discovered that this rose is a hybrid of R. nutkana rather than R. californica....

Book  (2000)  Page(s) 49.  Includes photo(s).
 
Rosa californica = Sa forme semi-double, ‘Plena’, est plus élégante au jardin; elle produit à foison ses fleurs rose lilacé vif et ses fruits vermillon.

Book  (Sep 1993)  Page(s) 20.  
 
The double form … commonest in the garden

Book  (1993)  Page(s) 67.  Includes photo(s).
 
[Listed under "Wild Roses and Their Cultivars"] Description. A cultivated form of Rosa californica. Summer flowering. Height: 8 ft. Well scented.

Book  (1988)  Page(s) 137.  
 
location 146/8, R. californica f. 'Plena' Rehd., according to A. Jäger identical with 'THEANO' by Geschwind, CINNAMOMEAE, R. Geschwind, 1895, pink-light carmine, semi-double, late-blooming, vigorous, upright, climbing, 2-3.5 m, large prickles, medium-dark green small-medium matte foliage, 5 leaflets, orange-coloured small rounded to urn-shaped glossy fruit, upright elongated persistent sepals, few hips

Website/Catalog  (1986)  Page(s) 33.  
 
Rosa californica plena.....H.

Website/Catalog  (1985)  Page(s) 39.  
 

Rosa californica plena..... 1894.

Book  (1984)  Page(s) 106.  
 
Rosa californica ‘Plena’/Rosa californica f. plena Rehder/’Theano’ = Obtenu par Geschwind en 1894. Feuilles = 5 ou 7 folioles elliptiques larges, 1 à 3cm de long, bords à dents simples… corymbes paniculés. Les tiges de l’année précédente s’arquent sous le poids des fleurs qui se forment sur toute leur longueur… fleurs doubles, mais peu serrées, varient du rose soutenu au pourpre pâle... La plante a, dans son ensemble, une réelle valeur décorative.

Website/Catalog  (1982)  Page(s) 32.  
 

Rosa california plena  Rich lilac-pink semi-double flowers born liberally on a gracefully arching bush in high summer. A very useful Rose. Unknown date. W. Shade tolerant. (S) 6 x 5’.

Magazine  (Nov 1981)  Page(s) 1. Vol 3, No. 4.  
 
Editor:  .....after a season of old roses such as I have never had before.  A few are still in full bloom as I write.  
For beautiful flowering shrubs you could hardly do better than try Rosa californica plena - small, semi-double spicy pink.