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'Sansho-Ubara' rose References
Article (magazine)  (2007)  Page(s) 370, fig. 1.  
R. roxburghii var. hirtula typical ploidy 2x
Website/Catalog  (2006)  Includes photo(s).
Sansho-Bara (Japanese Pepper (Zanthoxylum piperitum) Rose) R. hirtula (Regel) Nakai
Bot. Mag. Tokyo 34:14 (1920)
Distribution: Central Honshu
R. hirtula is found in the mountains between the chestnut zone and the beech zone in the Fuji-Hakone areas of central Japan. This is a deciduous tree which grows pretty large for a rose. The trees the author saw were about five metres tall. As the name suggests, this rose has leaves which look like those of the Japanese Pepper tree, and gives pale pink flowers 5 to 6 cm across during the rainy season in early summer. Its hips, covered with sharp prickles, look just like small chestnut burrs. In Autumn, when the hips ripen, a rich sweet scent like strong vintage liqueur fills the air under the tree.

It is a sort of mystery why this rose grows naturally in extremely limited places in the Fuji-Hakone areas. A fossil of "Akashi Sansho-Bara" (Rosa akashiensis Miki), found in a stratum near Kobe, is very famous, but needless to say, this species is now extinct.
Article (magazine)  (2001)  Page(s) 393.  
R. roxburghii Tratt. var. hirtula Rehd. et Wils Ploidy 2x
Pollen fertility 98.6%
Selfed Fruit set 0%
Book  (1988)  Page(s) 168.  
R. roxburghii Tratt. var. hirtula Rehd. & Wils., PLATYRHODON, Japan, northern China, 1862, light pink, single, medium size, bushy, branched, 1.5-3 m, light-medium green small-medium matte-glossy foliage, 13-15 leaflets, green medium size matte prickly fruit, upright persistent short sepals
Book  (1916)  Page(s) 320.  
Rosa Roxburghii var. hirtula Rehder & Wilson
[described primarily for its distinctions from R. roxburghii f. normalis, which has single flowers but lacks pubescence on the foliage]:
Its [R. Roxburghii f. normalis] ...leaflets and less sharply acute serratures and the absence of pubescence distinguish it from the Japanese R. Roxburghii var. hirtula Rehder & Wilson...It is this Japanese variety with single flowers which is in cultivation and which is figured by Hooker f. as R. microphylla... This var. hirtula is spontaneous in central Hondo, and Wilson has collected it at 1000 m alt. on the northern slopes of Fuji-san, Japan.
Magazine  (1885)  Page(s) 106-107. Series 4, Vol 11..  
Rosa Microphylla has several varieties: a variety with single flowers, pink, that Phonzo-Zoufou marks under the name of "Kin Ossi." Doctor Savatier found it grown in Tokyo, in the garden of Oya Kouyen. Another variety with double flowers bears the name of "Sansio bara," according to Phonzo-Zoufou.
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