1921] REHDER, NEW SPECIES, VARIETIES AND COMBINATIONS 15 



lobe, pubescent and stipitate-glandular on back, reflexed after anthesis, 

 later spreading; receptacle subglobose or broadly pyriform, smooth; 

 petals orbicular-obovate. 



Cultivated at the Arnold Arboretum under No. 6582; specimens col- 

 lected June 21, 1916, and June 12, 1921, (type) are preserved in the her- 

 barium of the Arnold Arboretum. 



This hybrid was raised at the Arnold Arboretum by Jackson Dawson 

 in 1914 by fertilizing R. rugosa with "G6n6ral Jacqueminot." It is a 

 very striking Rose on account of the deep red color of the large flower 

 and has proved perfectly hardy at the Arnold Arboretum. 



There seems to be no older available binomial for the hybrids between 

 R. rugosa and the different forms of the Hybrid Perpetuals to which 

 "G6n6ral Jacqueminot" belongs and which may be classed under R. 

 borboniana Desp., 3 though hybrids of similar origin have been raised by G. 

 G. Paul and others. Thus the name R. arnoldiana may stand as the bin- 

 omial designation for the hybrids between R. rugosa and the "Hybrid 

 Perpetuals." 



Rosa virginiana var. lamprophylla, var. nov. 



A typo recedit foliolis basi manifeste cuneatis ellipticis vel obovato- 

 ellipticis, rarius obovatis, apice acutis vel interdum rotundatis, glabris, 

 lucidissimis, breviter petiolulatis, foliis turionum 9-foliolatis. 



3 Rosa borboniana Desportes, Ros. Gall 106 (1828). — Morren in Ann. Soc. Agric. 

 Bot. Gand II. 11, t. 42 (1846).— Gravereaux, Ros. L'Hay, 27 (1902).— R. canina Bur- 

 boniana Thory in Redoute, Roses, III. 105, t. (1824); ed. 3, III. gr. 20, 3, t. (1835).— 

 R. indica (i. borbonica Hort. aDud K. Koch, Hort. Dendr. 122 (1853), nomen. - Regel 

 in Act. Hort. Petrop. V. 358 (Tent. Monog. Ros. 74) 1878), syn. nonnull. exclud. — R. 

 chinensis b. borbonica Dippel, Handb. Laubholzk. II. 563 (1893), syn. nonnull. ex- 

 clud. — R. Borbonica Mouillefert, Arb. Arbriss. I. 558 (1893). — Rehder in Bailey, 

 Cycl. Am. Hort. IV. 1551 (1902); Stand. Cycl. Hort. V. 2988 (1916).— Willmott, 

 Gen. Rosa II. 339, t. (1912). — R. gallica var. damascena Voss, Vilmorin's Blumen- 

 gaert. I. 254 (1894), pro parte. 



The typical R. borboniana was introduced about 1819 from the Island of Bourbon 

 to France and is considered a hybrid of R. chinensis var. semperflorens and a form on 

 R. gallica. From this cross the hybrid Bourbon Roses and later the Hybrid Per- 

 petuals have been derived which likewise are chiefly hybrids between forms of R 

 chinensis and forms of the Gallicae group. As these groups of hybrids originated 

 from the same species as the original Bourbon Rose or from closely related species 

 and no definite line can be drawn between these groups, it seems best to use R. bor* 

 boniana as the binomial designation for the whole group of hybrids of R. chinensis 

 (oossibly with some admixture of R. odorata )with the species and forms of the Gal- 

 licae group. 



Rosa borboniana Desp. must not be confused with R. Bourbonia Roessig (Oek.- 

 bot. Beschreib. Ros. II. 28 [1803].— R. formosa Roessig, Ros. no. 50, t. [1804?].— R. 

 gallica Burboniana Thory in Redoute, Ros. I. 74 [1817 ]); this is a form of R. gallica 

 in Roessig's time much cultivated in France, and judging by Roessig's description 

 and colored plate similar in appearance to R. borboniana, but it differs chiefly in 

 the short straight spines of the glandular stem, in the doubly serrate, fragrant, ovate 

 leaflets, in the doubly lobed sepals and the densely red-glandular receptacle. The 

 name R. Bourbonia Roessig can hardly be considered a homonym invalidating the 

 later R. borboniana, as the spelling and the derivation is different; the name "Bour- 

 bonia" being a personal name derived from the house of Bourbon, while "borbon- 

 iana" is a geographical designation referring tc the Island of Bourbon, where the plant 

 originated. 



