18 JOURNAL OF THE ARNOLD ARBORETUM [vol. hi 



Rosa californica Cham. & Schlecht. f . plena, nom. nov. — R. californica 

 Willmott, Gen. Rosa, I. t. opp. 233 (1911). — R. californica Hore pleno 

 Bean, Trees & Shrubs, Brit. Isles, I. 421 (1914). 



A form with double or semidouble flowers. 



Rosa Penzanceana, nom. nov. (R. Eglanteria x foetida punicea). — 

 R. rubiginosa x lutea punicea (Rose Penzance) Crepin in Jour, des 

 Ros. 1891, 123; in Gard. Chron. ser. 3, ix, 671 (1891). — R. lutea X rubigi- 

 nosa Crepin in Bull. Soc. Bot. Belg xxxm. 124 (1894). — R. rubiginosa x 

 lutea Keller in Ascherson & Graebner, Syn. Mitteleur. Fl. vi. 348 (1902). — 

 R. Eglanteria x punicea Willmott, Gen. Ros. n. 455 (1912). 



This hybrid, called the "Lady Penzance Rose," was raised by Lord 

 Penzance about 1894 from a cross between the Sweet Briar and the 

 Austrian Briar. It has the fragrant leaves of R. Eglanteria L. and pink 

 flowers suffused with yellow. A full description of this hybrid is given 

 in Miss Willmott's book cited above. 



X Prunus Dunbarii, hybr. nov. (P. americana x maritima). 



Much-branched shrub or tree to 5 m. tall, with broad spreading head; 

 spreading by suckers; young branchlets pubescent, at maturity nearly 

 glabrous and red-brown, becoming dark brown the second year; winter- 

 buds ovoid, acutish, light brown, puberulous or nearly glabrous. Leaves 

 elliptic-oblong or sometimes oblong-obovate, 4.5-9.5 cm. long and 1.8-5 

 cm. broad, abruptly acuminate, rounded to cuneate at base, sharply ser- 

 rate with acuminulate teeth, glabrous above except on the midrib or very 

 sparingly hairy, pubescent beneath on the midrib and less densely so or 

 sometimes glabrescent on the veins and veinlets; petioles 0.5-1 cm. long, 

 densely short-pubescent. Flowers 2-4, white, about 1.5 cm. across; 

 pedicels 5-8 mm. long, minutely pubescent toward the apex or nearly 

 glabrous; sepals oblong, obtuse, as long or slightly longer than the tube, 

 entire, finely pubescent outside, villose inside, petals obovate, about 7 

 mm. long, with a long claw; stamens about as long as petals. Fruit sub- 

 globose, purple, slightly bloomy, 1.7-2 cm. across, on slender stalks 

 about 1.5 cm. long; stone broadly ovoid, compressed, sharply keeled on 

 one side, 1.3-1.5 cm. high and 1.2 cm. wide, smooth. 



Cultivated in Genesee Valley Park (old Frost Nursery) and Highland 

 Park, Rochester, New York. Specimens in herb. Arnold Arboretum: 

 Genesee Valley Park, April 24, 1921, B. N. Slavin and April 25 and August 

 15, 1921, J. Dunbar & R. E. Horsey, (Edson No. 0-1154, type); High- 

 land Park, April 25, 1921 and October 9, 1920, J. Dunbar & L. G. Edson 

 (Edson No. 0-1152). Photograph of the tree in Genesee Valley Park 



Morsey 



Arnold Ar- 



boretum. 



This hybrid originated about 22 years ago from seed of P. maritima 

 collected by Mr. John Dunbar in Highland Park. The tree in Genesee 

 Valley Park is now nearly 5 m. tall with a short trunk about 0.3 m. high 



