246 CALIFORNIA ACADEMY OF SCIENCES. [PROC. 3D Ser. 



This species is related to Ribes nevadense Kellogg from 

 which it differs in the glaucous color of its foliage, the 

 racemes erect in fruit, and the shape of the floral organs. 

 It was collected by the author on Mount Shasta, August 13, 

 1893. No note was taken of the exact locality, but it must 

 have been some place on the trail from Sisson. 



V' 7. Ribes oligacanthum, sp. nov. 



Plate XXIV, Figs. 8a and ^b. 



Erect, branching shrub with the younger stems puberulent, older gray- 

 brown, not shreddy, somewhat tortuous, unarmed, except for the simple or 

 triple thorns at the leaf-axils; these often short and abortive. Leaves broadly 

 ovate or orbicular, three- to five-lobed, 2-3 cm. wide and about as long, with 

 margin laciniate-dentate, base truncate, but cuneate where it joins the petiole, 

 glabrous; petioles slender, as long as or twice as long as the blades, glabrous 

 or puberulent; stipular dilation twice as wide as the petiole, ciliate with white, 

 silky hairs. Peduncles filiform, one- to three-flowered, 1-2 cm. long; pedicels 

 almost as long, together becoming 4 cm. long, slightly puberulent; bracts 

 broadly ovate to orbicular, acuminate, three-angled, clasping, reflexed. 

 Calyx 12 mm. long, the linear, acute segments more than twice as long as 

 the tube, 2 mm. wide, apparently white, veined with parallel veins that 

 branch near the apex, puberulent or glabrous. Petals involute, obovate 

 when spread out, irregularly denticulate at apex, 3 mm. long, veins palmate. 

 Filaments almost twice as long as the petals, dilated at base; anthers oblong- 

 ovate, cordate at base, tipped with a recurved mucro. Style divided two- 

 thirds of its length, slightly exserted. Young fruit puberulent, clothed with 

 a few long spines (about ten) each about 5 mm. long. 



Related to Ribes calif ornicum Hook. & Arn. from which 

 it differs in the sparsely spinous fruit, the glabrous leaves, 

 the lax inflorescence, and the shape of the floral organs. 



Collected by the author on the road between Jolon and 

 King City, in Monterey County, California, near Mans- 

 field's Ranch, ten miles from King City, May, 1897. 



/ 8. Ribes sericeum, sp. nov. 



Plate XXIV, Figs. 9^-9/. 



Erect, branching shrub, several feet high; stems clothed with numerous 

 fine, weak, short prickles, which are gland-tipped on the young shoots, also 

 with short, close, silky pubescence; axillary thorns three, orange-color, stout, 

 united, the middle one longest, more than i cm. long, broadening at the 



