SUPPLEMENT TO THE FLORA OF MONTANA. 63 



Ribes camporum, n. sp. 



Infra-axillary spines 1-3, short; more or less prickly and densely 

 canescent on the younger branches: leaves usually small, 1-2 cm. 

 long, deeply 3-5 lobed, lobes deeply and often acutely incised, cor- 

 date or truncate at base, thick, densely canescent with short hairs, 

 especially below when young, veins impressed above, salient be- 

 reath; petioles about the length of the blade, Ian ate: peduncles 

 short, 1-2 flowered; pedicels and calyx glabrous: bracts and bud 

 scales glabrous and ciliate : flowers 8-10 mm. long; calyx-tube cylin- 

 tiric, about the length, or a trifle longer than the lobes, greenish- 

 white or somewhat purplish : petals spatulate or oboval, about half 

 the length of the calyx lobes; stamens equaling the petals: fruit 

 glabrous, apparently red when ripe, 6-8 mm. diameter. A shrub 

 6-12 dm. high on dry cliffs and broken uplands throughout the plains 

 region east of the mountains. 



Apparently R. Cynosbati, MX. var. y of Hooker (Fl. Bor. Am. 1 :23o) 

 and R. o.vycantlwidcs, L. var. y of Torrey & Gray (Fl. N. Am. i '.546), 

 but all the specimens consulted seem to show the calyx, pedicels 

 and fruit glabrous, though there may be variation in this respect. 

 Certainly different from R. setosum, Lindl., which has larger, thinner, 

 nearly glabrous, crenately dentate leaves, much less conspicuous 

 veining, longer pedicels and calyx-tube nearly twice longer than its 

 lobes. R. sctosnin is a shrub of the lowland thickets, while 

 R. camponnn is found on the dry upland cliffs. It is also very differ- 

 ent from R. sa.rosum, Hook., which has larger, glabrous leaves, 4-6 

 flowered peduncles, larger flowers, fewer prickles and the pubescence 

 \\ holly lacking; the range of the latter also is west of the Continental 

 Divide. R. camponim appears to extend from the Saskatchewan 

 southward to Colorado in the plains east of the mountains. 



Big Horn River, 7 miles south of Custer Station, May 3, 1890, No. 

 9: Glasgow, July 17, 1900 (in fruit) ; Wibaux, May 25, 1902. 



Ribcs cchinatiini, Lhidl. ; Rydberg, Flora, 202. It does not seem 

 possible to separate the western form of ' R. lacustrc, Poir, from 

 the eastern one, as the characters given do not hold. 



Ribcs Hudsoniiinnni, Richards. All Montana specimens so re- 

 ferred are R. pcliolarc, Dougl., which has larger leaves, longer race- 

 mes and glabrous calyx. Hndsonianttm is more northern and appar- 

 ently does not reach our limits. 



Ribes lacustre, Poir. includes R. cchinatum, Lindl. See above. 



