20— ROSA JACKSON I Hort. 
(ROSA RUGOSA x WICHUR AI ANA) 
/^osa Jacksoni : caulibus brevibus, arcuatis ; aciileis inae(jualil)us, liaud densis, 
rcctis, gracilibus ; foliolis 7-9, oblongis, obtusis, firmis, glabris, late breviter sim- 
pliciter serratis ; rhachi aciculata, baud glandulosa ; stipulis adnatis, apicibiis liberis 
ovatis ; floribus pluribus, corymbosis ; pcdicellis leviter aciculatis; calycis tubo 
globoso, leviter aciculato ; lobis ov^ato-lanceolatis, apicibus elongatis, dorso leviter 
glandulosis ; petalis magnis, rubris ; stylis liberis, hand protrusis ; fructu globoso, 
rubro. 
Stems low, arching ; prickles very unequal, not dense, straight, slender, the 
largest 5 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- 
lube 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. 
R osa Jacksoni is one of the nunierous hybrids to which these two 
Roses {Rosa IVic/inraiaiia and Rosa rnflosa) 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 tlie earliest of the 
Wichuraiana hybrids. It is exactly intermediate between its parents, 
and is of graceful habit and good constitution, often niaking shoots 
seven to eight feet long m one season. It is extremely Horiferous and 
is in every way an acquisition to a garden. 
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