2o— ROSA JACKSONI Hort. 
(ROSA RUGOSA x WICHURAIANA) 
Rosa Jacksoni : caulibus brevibus, arcuatis ; aculeis inaequalibus, haud densis, 
rectis, gracilibus ; foliolis 7-9, oblongis, obtusis, firmis, glabris, late breviter sim- 
pliciter serratis ; rhachi aciculata, haud glandulosa ; stipulis adnatis, apicibus liberis 
ovatis ; floribus pluribus, corymbosis ; pedicellis leviter aciculatis; calycis tubo 
globoso, leviter aciculato ; lobis ovato-lanceolatis, apicibus elongatis, dorso leviter 
glandulosis ; petalis magnis, rubris ; stylis liberis, haud prompts ; fructu globoso, 
rubro. 
Stems low, arching ; prickles very unequal, not dense, straight, slender, the 
largest £ in. long. Leaflets 7-9, oblong, obtuse, firm, glabrous or nearly so, openly 
shallowly simply serrated ; petioles aciculate, not glandular; stipules adnate, with 
ovate free tips. Flowers several, corymbose ; pedicels slightly aciculate. Calyx- 
tube globose, slightly aciculate ; lobes ovate-lanceolate, with long leafy tips, slightly 
glandular on the back. Petals large, bright crimson. Styles free, not protruded 
beyond the disc. Fruit urceolate-globose or ampullaeform, bright red, much 
smaller than in Rosa rugosa. 
Rosa Jacks om is one of the numerous hybrids to which these two 
Roses ( Rosa IV ichuraiana and Rosa rugosa) have given rise. It was 
raised at the Arnold Arboretum by Mr. Jackson Dawson, and was 
sent from thence to Kew in 1897; it is thus one of the earliest of the 
IV ichuraiana hybrids. It is exactly intermediate between its parents, 
and is of graceful habit and good constitution, often making shoots 
seven to eight feet long in one season. It is extremely floriferous and 
is in every way an acquisition to a garden. 
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