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A Monograph of the Genus Rosa in North America. II. R. foliolosa
(1958)  Page(s) 145, 152-153.  
 
[p. 145] To Nuttall's description, Torrey and Gray added several phrases of questionable validity. One especially have [sic] created a minor intraspecific problem, i.e., thie "flowers small, apparently rose-color." The rose-coloured petals have been considerted typical of R. foliolosa and this quite naturally has led to the naming of the white petalled individuals as var. alba Bridwell and as f. alba (Bridwell) Rehder...It is of interest, however, that white petalled individuals occurs (as observed in Texas by Dr. L. H. Shinners and myself) more frequently than do the pink, although extremely light pink to rose colours may be discerned (especially in Oklahoma). Certainly the occurrence of white is not as a result of an uncommon gene(s) expression as a forma should be...
[p. 152-153] description Stems low, 2-6 dm. tall, armed with infrastipular fine thorns (86%) or without armature (14%) on the floral branches; leaves 5-11 foliolate, usually 9; leaflet lanceolate, shining above...glabrous above, glabrous (96%) or slightly pubescednt (4%) below, eglandular below...serrations single (98%) or rarely somwhat biserrate (2%), eglandular (28%) or slightly gland-tipped (78%)...inflorescence 1-5 flowered, generally with one flowers...pedicels...glabrous (98%) or rarely somewhat pubescent (2%), eglandular..., slightly glandular..., or with numerous glands...chromosome number 2n=14.
From the data presented...it is apparent (for this sample studied) that the individual exhibit an extensive degree of homomorphism. There is no doubt, however, that intraspecific variation does exist. Petal colour from white to pink...are known examples.
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