402 RvDBERG : Notes on Rosaceae 



dninosa Nutt. and Holodisciis australis Heller are not exactly 

 alike. The former represents the extreme hairy form with more 

 than usually double toothed leaves and the latter the more gla- 

 brate extreme with simpler teeth. 



It was with some reluctance that the writer proposed his new 

 species S. franciscana, not because the type is not amply distinct 

 from S. discolor, but because there are forms that connect the two. 

 The former is characterized by its thick, dark green leaves, densely 

 short-hairy, almost velvety above ; the latter by its thin leaves, 

 glabrous or almost so above. The following specimens are to be 

 referred to 5. franciscana : 



California: Monterey, on the Mexican Boundary Survey, 

 1850, C. C. Parry ; Southern Upper California, Fitch 2 and j; 

 Sonoma (Whipple's Exploration), Bigcloiv 4; Pilarcitos, Sept., 

 1867, i\^. /. Davis ^8; San Leandro, June, 1888, Undcriuood 

 (type); Albion Ridge. Mendocino County, June, 1903,/- Mc- 

 Mnrphy 266; Crystal Spring Lake, June, 1903, Elmer 42yji. ; 

 [no locality], Thomas Bridges ioo[a) ; i868-'9, Kellogg & Har- 

 ford 201 ; Crystal Spring Lake, Sept. 2, 1902, Baker 1532 ; 

 Ukiah, Mendocino County, July 11, 1902, Heller; Duncan's 

 Mills, July 18, 1882, M. E. Jones jsjg ; Santa Lucia Mountains, 

 June, 1898, R. A. Plaskett 161 ; Mendocino, June, 1898, H. E. 

 Brozvn Soj ; Coast Hills, San Luis Obispo County, May, 1885, 

 Mrs. Siunmers gj. 



S. pachydisca Rydb. of Mexico is intermediate between 5. dis- 

 color and 5. dujnosa in leaf- form, but differs from both in the much 

 more developed disk in the mouth of the hypanthium. This may 

 be the same as Schizonotiis argenteiis intennediiis O. Kuntze, but 

 Kuntze's description is too incomplete. 



It is strange that Spiraea Boiirsieri Carr. has not been recog- 

 nized, notwithstanding the excellent figure published in the Revue 

 Horticole.* The few specimens in existence in our herbaria have 

 been included in vS. dnmosa, as interpreted by S. Watson, perhaps 

 on account of its small and simple inflorescence. 5. Boursieri dif- 

 fers, however, from 5. microphylla and S. concolor in the shape of 

 the leaves and the much larger flowers. It has the largest flowers 

 of all the United States species known. To it may be referred : 



* 1859 : /. JoS. 



