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Rosa ├Śmikawamontana Mikanagi & H. Ohba (Rosaceae), a New Hybrid between R. sambucina and R. paniculigera
(Aug 2011)  Page(s) 248-252.  Includes photo(s).
 
On 21 May 2004, a rose closely resembling Rosa sambucina Koidz. was found by the members of the Old Roses and Climbers Club, an amateur rosarians’ group. The locality was on the bank of the Ohshima River, a branch of the Ure River in Kawai, 240 m above sea level, in Horai-cho, Shinshiro, Aichi Prefecture. When discovered, it was not in bloom yet. Mr. Masanobu Tsuji propagated it from cuttings in Osaka Prefectural Hamadera Park where he is working for, and they gave flowers in May, 2007. The shape of their inflorescences was paniculate as seen in R. paniculigera (Koidz.) Makino ex Momiy., not corymbose normally seen in R. sambucina. Rosa sambucina and R. paniculigera are presumably its parents. If so, it is the first report of a natural hybrid of R. sambucina...

Rosa ×mikawamontana Mikanagi & H. Ohba, hybr. nov. [Figs.1– 3] Hybrida putativa inter Rosam sambucinam Koidz. × R. paniculigeram (Koidz.) Makino ex Momiy., floribus diametro ca. 25 mm et cetera inter parentes media.
Type: JAPAN. On the bank of Ohshima River, a branch of Ure River, alt. 240 m, Kawai, Hourai-cho, Shinshiro, Aichi Prefecture, cultivated at Hamadera Park, Osaka Pref....
Deciduous shrubs with erect, stout stems; branches elongate, climbing on trees, with many hooked hard spines; branchlets slender, young leaves reddish and nodding. Leaflets 5, rarely 7, also 3 at nodes subtending the inflorescence, terminal leaflets oblong rarely obovate; lateral leaflets the same as the terminal one, also narrowly oblong, oblong-lanceolate, rarely obovate, almost sessile or shortly petiolulate, less than 1 mm long; 2–4 cm long, 1–1.5 cm wide, apex acuminate, base rounded-cuneate, margin acutely serrate except base, upper surface more or less lustrous; lower surface whitish. Stipules narrow, adnate almost entirely to petiole, with short-stalked glands on margin.
Inflorescence paniculate, 6–20-flowered, axes with glandular hairs. Flowers ca 2.5 cm across, pedicels 1–2 cm long, with short stalked glands. Calyx with short stalked glands, calyx tube ovoid-fusiform; lobes ovate-lanceolate, ca. 0.8 cm long, sometimes with 1 or 2 lobules, inside and margins with dense wooly hairs. Petals white, obovate, ca 1.2 cm long. Fruits globose, 5–7 mm across, red when matured...
Nom. Japan: Yama-miyako-ibara (nom. nov.)
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