68 



Rosa Iioara /9. yesoensis Franch. et Sav. Enum. PI. Jap. II. p. 346. 



Rosa iimtsuana Makiuo mss. 



Rosa microphylla X rugosa Crepiu, ex Matsimi. in Bot. Mag., Tokyo, 

 X. (1896) p. 165. 



Shrubby, attaining 2 uj. or more iiigh ; branches glabrous or slightly 

 glandular-hirsute, rather densely or rather loosely aculeate ; aculei unequal, 

 recurvo-patent, dilated at the base, narrow, very sharp, straight or some- 

 what falcate, yellowish, largest one about 9 mm. long. Leaves pinnate, 

 3_4_jugate, petiolate ; petiole pubescent and very loosely armed with sub- 

 uncinate aculei as well as the rachis ; leaflets subclosely arranged, sub- 

 obovately elliptical to oblong, obtuse to shortly acuminate, obtuse or obtuso- 

 rounded at the base, simply or subduplicately serrate with very minutely 

 subcallose-tipped triangular teeth, very narrowly revolute on margin, rather 

 thinly pubescent beneath, glabrous and finely rugulose with impressed 

 veins above, veins erect-patent and about 5-9 on each side ; lateral ones 

 sessile, patent, those of the lowest pair usually reflexed ; odd one larger, 

 attaining about 4 cm. long, 2i cm. broad ; stipules membranaceous, ample, 

 adnate, auriculate with triangular-falcate acuminate rather erect-patent 

 lobes above, glanduloso-serrulate and ciliated on margin. Inflorescence 

 corymbose, or shortly paniculate, about 1-8-flowered, sessile, bracteate ; bract 

 lato-ovate to lanceolate, tapering above, ciliated and glauduloso-fimbriato- 

 errulate on margin, sessile, membrananceous. Flowers pedicellate, abouts 

 3|-4 cm. across, rose-purple ; pedicel strict, longer or shorter than bracts, 

 pubescent, lateral ones erect-patent. Oalyx-lobes ovato-oblong or oblong, 

 caudately long-attenuated above, entire or with a few linear lacini?e on 

 margin, patent or reflexed, lanate internally, sparsely glandular-pilose ex- 

 ternally; the tube globose, glabrous, about 5 mm. long. Petals 5, patent, 

 sessile, lato-obovate, emarginate. Stamens numerous, attaining about 7mm. 

 long. Styles dense, rather shortly exserted, lower than statni'us, filiform, 

 pubescent ; stigma capitate ; ovaries numerous, pilose. 



Norn. Jap. Ko-hamanasu (Keisuke Ito). 



Hah. Hokkaido {L. Bcehner ! herb. Sc. Ooll, Imp. Univ. Tokj'o, June 

 1874) ; Prov. Mutsu : Shirahama in Same-mura, Sannohe-gori {M. Koikaiva ! 

 1905; Y. Yamasaki \ June 1894), Sozeotai in Hashikami-mura, Sannohe- 

 gori (31. Koikaioa\ 1905). 



The thinly aculeate form is more inclined towards Rosa multijiora 

 Thunb. 



