us 



A flowering specimen in the herbarium of Lafayette College, 

 collected by Prof. Rothrock at Santa Barbara, seems distinct, but 

 wliether it is Chamisso's Rose I cannot tell. It is the terminal 

 portion of a bush, probably 3 ft. high, with stout recurved gemin- 

 ate spines (resembling those of ^, Caniiui) without prickles; 

 sepals entire ; flow^crs solitary or corymbose, on short, densely 

 pubescent pedicels; stipules pubescent, narrow, witii diverging 

 apices; fruiting receptacle ovate; leaflets 5 to 7, elliptical to 

 oblong-obovate, broadly obtuse or truncate at the apex, taperin 

 to the base, glabrate above, villose-pubesccnt beneath; serrations 

 compound-glandular. This doubtless varies with spines nearly 

 straight, stem taller and prickly, and with leaves, stipules and 

 pedicels with varying degrees of pubescence and glandulosity. 



8. Many roses take on a surculose habit, which would appear 

 to be due to unfavorable conditions of erowth or to severe cold. 





t> 



As we have seen, var. Arkausana Is an example, as are also cer- 

 tain forms of 7?. huuiUls and R. foliolosa. R. Californica likewise 

 seems so disposed. In J)Ot. Calif. 2, 444, Dr. Watson describes 

 /v. Sipithanicca, Subsequently, however, he regards it as a ** dwarf 

 form of the resinous variety.'' * Specimens of this, collected by 

 Mr. Rattan along the Trinity River, and kindly loaned me by Dr. 

 Watson, seem to warrant his conclusion. It is most probably a 

 surculose form of some rose uhich grows stouter under more 

 favorable conditions. 



The same maybe said of specimens collected by Prof. E. L. 

 Greene in Petrified Forest, Sonoma County, and which differ in 

 several respects from those collected by Mr. Rattan. It would 

 seem probable that these are a surculose form of a closely related 

 yet distinct/z'i.^ species. The description here given is based on 

 specimens in fruit, furnished by Drs. Porter and Britton. Stem 

 6 to 10 inches high, with stout prickles and long straight or slightly 

 recurved geminate spines; leaflets 5, roundish-ovate, petiolulate, 

 broad and markedly inequilateral at base, crenate-scrrate, toothing 

 obtuse, apiculatc and serrulate ; stipules short, broadest below the 

 middle, apices diverging; flowers many in flat-topped corymbs ; 

 sepals short, oblong-lanceolate, pointed, erect and persistent on 

 matured fruit; styles gradually enlarged upward, capitate ; pedi- 



*i> 



IVoc. of llie Am. Acad., V^o!. 20, p. 3.44. 



