GROSS UL ART ACE AE (GOOSEBERRY FAMILY) 



241 



Very similar to the species but petals evident, elliptic-spatulate, as long as 

 the calyx-lobes: as in the species the carpels are immersed in a crest-margined 

 disk which persists at the middle of the mature carpels as an undulate ridge. 

 (Micranthcs arnoglossa Small, 1. c. 138.) At high elevations in the Colorado 

 mountains. 



52. GROSSULARIACEAE DUMORT. GOOSEBERRY FAMILY 



Erect or procumbent branching shrubs with alternate palmately lobed, 

 often resinous-glandular or viscid leaves; stipules when present adnate to 

 the petiole. Flowers racemose, rarely solitary on 1-2-leaved axillary shoots; 

 pedicels subtended by a bract and usually bearing 2 bractlets at about the 

 middle. Calyx-tube adnate to the globose ovary and more or less produced 

 above it. Petals 5 or rarely 4, erect, mostly smaller than the calyx-lobes. 

 Stamens equaling the petals in number and alternate with them. Ovary 

 1-celled with 2 parietal placentae; styles 2, more or less united; stigmas ter- 

 minal. Fruit a berry, crowned with the withered remains of the flower. 



1. RIBES L. GOOSEBERRIES AXD CURRANTS 

 The only genus; characters of the family. 



Stems usually armed with spines and often with prickles (setose- 

 hispid); leaves plicate in the bud ((Jooseberries; Nos. 5 A: ti 

 transitional). 



Racemes 1-4-flowered; calyx-tube cylindrical or campanulate. 

 Spines solitary or wholly wanting, but the stems often setose- 

 hispid. 



Spines short or unequal; setose-hispid or nearly unarmed 

 Leaves glabrate or puberulent; fruit smooth 

 Leaves closely pubescent ; fruit hispid 

 Spines long and conspicuous; setae few; leaves glabrate 

 Spines triple, long . ....... 



Racemes several-flowered ; calyx-tube salverform. 



Leaves finely pubescent; fruit red ..... 



Leaves glabrate; fruit black ...... 



Stems unarmed (neither thorns nor prickles present) (Currants.) 

 Flowers not yellow; leaves plicate in the bud. 

 Berry glandular-bristly. 



Leaves glabrous; fruit spherical. 



Calyx-tube salverform .... 



Calyx-tube campanulate 

 Leaves pubescent and glandular; fruit ovoid 

 Berry smooth (rarely glandular in No. 12). 

 Calyx-tube campanulate. 

 Racemes erect or ascending 

 Racemes drooping .... 



Calyx-tube cylindrical, with dilated base . 

 Flowers yellow; leaves convolute in the bud 



1. R. saxosum. 



2. R. setosum. 



3. R. leptanthum. 



4. R. saximontanum. 



5. R. lentum. 



G. R. parvulum. 



7. R. coloradense. 



8. R. Wolfii. 



9. R. viscosissimum. 



10. R. Hudsonianum. 



11. R. americanum. 



12. R. cereum. 



13. R. longiflorum. 



1. Ribes saxosum Hook. Fl. Bor. Am. 1: 231. 1833. Stems simple or 

 branched, sometimes unarmed but usually more or less prickly and with 

 scattering short spines: leaves from glabrous to finely puberulent, 3-5-lobed; 

 the lobes crenately incised or coarsely toothed; base usually somewhat cor- 

 date: peduncles short, deflexed; peduncles and bracts glabrate or minutely 

 glandular and pubescent: calyx-tube usually glabrous; the lobes reflexed and 

 twice as long as the petals: stamens not longer than the calyx-lobes: berry 

 smooth and often quite large, dark purple. R. divaricatum irriguum and R. 

 oxyacanthoides. (R. Purpusii Koehne, Deutsche Dendr. 187. 1893; R. inerme 

 Rydb. Mem. N. Y. Bot. Card. 1: 202. 1900; R. vallicola Greene.) Our com- 

 monest gooseberry; throughout our range and extending into the Canadian 

 regions. 



2. Ribes setosum Lindl. Trans. Hort. Soc. 7: 243. 1830. A low branched 

 bush: spines usually present, single or paired and spreading; prickles gen- 



ROCKY MT. BOT. 16 



