ADDITIONAL NOTES ON MEXICAN PLANTS OF THE 



GENUS RIBES 



By J. N. ROSE 



In 1905 1 I published a synopsis of the Mexican species of Rides, 

 in which sixteen species were enumerated. Seven of these were 

 described as new. By oversight Rlbcs brandegei of Dower Cali- 

 fornia was omitted. Beautiful specimens of this species have been 

 sent in recently by Messrs. E. W. Nelson and E. A. Goldman from 

 Dower California. Since the publication of my paper, two Califor- 

 nian species, R. indecorum and R. viridifolium, have been found in 

 northern Dower California, while the new species which is de- 

 scribed below has come to hand from Durango. Messrs. Nelson 

 and Goldman have re-collected Ribcs quercetorum in Dower Califor- 

 nia and R. ceriferum has been collected in flower for the first time 

 by Dr. E. Palmer in Durango. A new species from Hidalgo, Ribes 

 altamirani Jancz.," was described in 1906. No specimens of this 

 species have been seen by me, but it is said to be related to R. affine 

 and R. ciliatum. 



Recently also Ribes viburnifolium has been reported from one of 

 the islands off the coast of California, and this species is therefore 

 not confined to Mexico, as was supposed. 



RIBES MADRENSE Coville & Rose, sp. nov. 



Second-year branches light brown, somewhat pubescent; young 

 growth green, densely pubescent ; prickles either simple or 3-branched , 

 at first yellow, in age brown, 4 to 5 mm. long; petioles 1.5 to 2 cm. 

 long, pubescent; leaves more or less deeply 3-lobed, the lobes 

 strongly toothed or cleft, more or less glandular and pubescent on 

 both surfaces; peduncle pubescent ; bractlets broadly ovate, obtuse; 

 calyx tube 3 mm. long; lobes of calyx 6 mm. long, slightly hairy; 

 petals about half as long as the calyx lobes, dark red; style glabrous; 

 ovary glabrous; mature fruit not seen. 



Collected by Dr. E. Palmer near Quebrada Honda, Durango, May, 

 1906 (no. 215). 



7>yV.— U. S. National Herbarium, no. 571237. 



The only Mexican species which is at all near this is R. i/iicro- 

 phylliun, a plant distinguished by its stouter prickles, smaller leaves, 

 somewhat different flowers, etc. 



'Contr. Nat. Herb. 8 : 295-300. -Bull. Acad. Crac. 3 : 10. 1906. 



