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'R. setigera inermis' rose References
Book  (1994)  Page(s) 4, 22.  Includes photo(s).
 
Page 4: [One of the 65 climbing roses Stephen Scanniello describes in detail in his book and that grows in the Cranford Rose Garden at the Brooklyn Botanic Garden. There are several pages devoted to this rose, including its history, cultivation, and a photograph. Here are some highlights, but please refer to the book for more details.]

Played a role in the development of climbing roses. It was used by a number of breeders, including Dr. Walter Van Fleet.
Page 22: [Photo]
Book  (1994)  Page(s) 23.  
 
[One of the 65 climbing roses Stephen Scanniello describes in detail in his book and that grows in the Cranford Rose Garden at the Brooklyn Botanic Garden. There are several pages devoted to this rose, including its history, cultivation, and a photograph. Here are some highlights, but please refer to the book for more details.]

A wild rose native to North America… named by the French botanist André Michaux (1746-1802)… In 1811 a British botanist, Robert Brown, found a form of this rose that he mistook for a new species; he called it Rosa rubifolia because of its blackberry-like leaves. As a result, there is much confusion in the old literature, where R. setigera is often listed as R. rubifolia.

American hybridizers used it in their breeding programs… William Prince, and his son William Robert Prince, worked with it in the 1820s; unfortunately, the results of their efforts no longer exist… In general, hybridizers had difficulty perfecting R. setigera and breeding its good characteristics into roses of other classes.
Book  (1994)  Page(s) 24.  
 
'American Pillar' is one of the most successful setigera hybrids. (Van Fleet, 1902). Later, M.H. Horvath used R. setigera in the creation of his "Treasure Island" climbers. Two of the most successful were 'Doubloons' (1934) and 'Long John Silver' (1934).

Flowers: bright pink, scentless, 2 inches in diameter, five wavy petals. Hips: red. In autumn, the leaves turn fiery red, and during the coldest months, the canes… [become] a deep plum red that contrasts with the pronounced white of their menacing prickles…

The large, broad, rough leaves of R. setigera resemble those of blackberry bushes, and the canes, which can grow at least ten feet long in one season, are also like those of the blackberry - arching, extremely prickly and quick to root wherever they touch the ground. Because it roots so easily, and also because birds, which love the hips, distribute the seeds, R. setigera spreads rapidly and can be invasive.

not affected by insects and diseases.
Book  (1994)  Page(s) 34.  
 
[In Adelaide, South Australia, R. setigera] is usually in flower at Christmas
Magazine  (1993)  Page(s) 74-86, vol. 71, no. 1.  Includes photo(s).
 
Floral development of Rosa setigera
Kemp, et al.
ABSTRACT
The development of the flower of Rosa setigera from initiation to the onset of anthesis is described. Rosa setigera is the only known member of the genus Rosa to exhibit dioecy. Flowers of functionally staminate (male) and functionally carpellate (female) plants appear identical, a condition referred to as cryptic dioecy. Discrete sepals and petals are formed on the floral meristem. As the hypanthium forms, stamens are initiated in alternating whorls on the wall of the hypanthium and continue to develop as the hypanthium extends. Carpel primordia arise individually on the remainder of the floral meristem and show neither adnation to the hypanthial wall nor coalescence to one another as they give rise to the styles and stigmas that are exserted above the hypanthium lip. The only observable fusion in this species appears to be the postgenital fusion of the margins of the carpel primordia to form the enclosed locule. Although historically the hypanthium has been variously interpreted as either axial and (or) appendicular in nature, resulting from congenital fusion of sepals, petals, and stamens, this paper uses a more realistic, testable and functional approach to the development of the hypanthium that is in keeping with current concepts such as process morphology.
Article (magazine)  (1993)  Page(s) 550.  
 
....The number of flowers present on male plants of R. setigera is greater than on females....Both plants produce copious pollen; however, the pollen of the flowers of female plants is mostly malformed and nonfunctional. In pollen viability tests, the pollen of flowers of male plants produce a pollen tube from over 60% of its pollen whereas pollen from female flowers does not form a pollen tube....
Book  (Aug 1990)  Page(s) 57.  
 
scentless, clustered, deep pink flowers... a native North American rose, discovered by the great French botanist and plant explorer André Michaux, who was sent on a plant-collecting expedition to the New World by Louis XVI in 1785... 'Bramble Leaved Rose'... The only climbing rose native to North America... used extensively by John and Samuel Feast in Baltimore, Maryland, to create a series of important ramblers, one of which was 'Baltimore Belle'... 'Bramble Leaved Rose', 'Prairie Rose'
Article (magazine)  (1990)  Page(s) 229-243.  
 
Abstract: Rosa setigera is unique among known roses because it is truly dioecious, yet the plants and flowers are almost impossible to sex. Subtle differences in the inflorescences have been detected, for example, there are more flowers per inflorescence on male plants than on female plants and petal expansion from the day of opening to the next day is greater in females than in males; in addition, pollen from female plants appears somewhat collapsed and does not germinate. Pollinators (Apis mellifera, other bees (Apidae), Eristalis tenax and other Syrphidae: Diptera) visit the blossoms mostly in the morning to collect pollen (there is no nectar) and in choice experiments do not discriminate between male flowers and female flowers on landing, but do spend significantly more time on the former. They do discriminate between freshly opened flowers and day-old flowers, and show marked preference for bouquets of five flowers vs. single flowers. The female plants, with smaller inflorescences and lesser interest to pollen foraging insects, seem to encourage them to forage at more flowers than do their male counterparts. This may be biologically significant for effective pollen flow in a dioecious pollenonly plant with pollenivorous pollinators.
Book  (1988)  Page(s) 22.  
 
Samuel Feast, a nurseryman iof Baltimore [Maryland]... used the native 'Prairie Rose' (then named R. rubifolia and now R. setigera to breed some outstanding climbing roses...
Website/Catalog  (1985)  Page(s) 42.  
 

Rosa setigera..... 4 x 6’.

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