carries only seven of these chromosomes. In this project nine seedlings were 

 grown from the cross R. ei^lanteria x N. H. i^5211 rambler and one from 

 Skinners Rambler x Lady Penzance (7?. es;lanteria x R. joetida hicolor 

 (Jacq.) Willm.). These have not been fully evaluated but do exhibit the 

 usual first generation characteristics of Sweetbriar hybrids. Seedlings in 

 which the maternal parent was Sweetbriar strongly resemble that species 

 with such minor variations as stem and flower color, extra petals, etc., and 

 the fruity fragrance of the foliage has been retained. Seedlings in which 

 Sweetbriar was the pollen parent exhibit little if any noticable resemblance 

 to that species. Those few second generation seedlings of Sweetbriar that 

 anyone has been able to grow since the first hybrids were produced around 

 1895 are said to resemble that species in all respects. 



Attempts to cross both the Damask Roses and French Roses, hybrids of 

 Rosa damascena Miller and Rosa gallica L. respectively, with Skinners 

 Rambler have resulted in very few seeds and no worthy seedlings. Oratam 

 is a hybrid Damask rose having large flowers and a strong perfume. Nine- 

 teen seedlings from the cross Skinners Rambler x Oratam inherited the fra- 

 grance, copper flower color, leaf type and armature of Oratam, but also 

 extreme susceptability to blackspot. All of them are sterile. Eleven other 

 seedlings having no Oratam features resembled vigorous, wild species, R. 

 multiflora. 



Skinners Rambler was crossed with Bonfire, a double flowered, red, 

 multiflora-type rambler and an F^ population of 63 seedlings was grown. 

 All grew vigorously until attacked by mildew and all were discarded. 



Skinners Rambler x Rosa ruhrifolia Vill. yielded only seven seedlings 

 following repeated pollinations and none of these had any resemblance of 

 the Redleaf Rose. R. ruhrifolia is another of the Caninae roses which is 

 tetraploid but has only 7 chromosomes in the pollen. 



Perhaps the most luxurious, wrinkled, dark green foliage of any rose 

 is that of Max Graf, a hybrid of Rosa riigosa Thunb. and Rosa wichuraiana 

 Crep. It has long flexible canes and large, single, pink flowers. Max Graf 

 has 14 somatic chromosomes and is nearly sterile. Skinners Rambler x 

 Max Graf yielded an F^ population of 24 plants, all thin caned, small 

 leaved ramblers that are not particularly resistant to mildew disease. 



N. H. #500 {Rosa wichuraiana x Betty Bland). This is believed to be 

 the first successful cross involving the genes of Rosa wichuraiana and R. 

 blanda. A thin, red caned rambler with single pink flowers that rarely pro- 

 duce seeds, N. H. #500 is extremely winter hardy. This hardiness comes 

 from the pollen parent, Betty Bland, which N. H. #500 resembles in many 

 of its characteristics. It has 14 somatic chromosomes. 



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