358 co>:tpjbutions from the national herbarium. 



Abundant in many places; a characteristic shrub about alpine meadows. The 

 fruit is sour and somewhat bitter. The flowers last a long time. 



2. GROSSULARIA Mill. 



1. Grossularia inermis (Rydb.) Coville & Britton. Wild gooseberry. Common 

 in woods and thickets at low and middle altitudes; often associated with aspens. 

 B. C. and Alta. to N. Mex. and Calif. {Ribes inerme Rydb.)— Shrub, a meter high or 

 less, with few or no spines; leaves glabrous, lobed; flowers 5 to 6 mm. long, greenish 

 and inconspicuous; sepals and petals each 5; stamens 5. 



The fruit, which is borne in abundance, is of good flavor when ripe. Wild goose- 

 berries are very abundant in the thickets along Swiftcurrent Creek below Lake 

 McDermott. 



42. ROSACEAE. Rose Family. 



Herbs or shrubs; leaves simple or compound, alternate, usually with stipules; 

 sepals usually 5; petals as many as the sepals; stamens usually many, most commonly 

 20; fruit dry or fleshy. 

 Leaves simple, toothed or lobed; plants with woody stems. 



Plants prostrate, forming mats; petals 8 to 10; fruit of achenes with long hairy 



tails 8- CRYAS. 



Plants erect shrubs; petals 5; fruit not of tailed achenes. 



Leaves large, 10 to 20 cm. broad ; fruit like a raspberry 11. RUBTJS. 



Leaves small, much less than 10 cm. broad; fruit dry. 



Flowers in pointed panicles; fruit of small achenes ... 3. SERICOTHECA. 

 Flowers in flat-topped corymbs; fruit of small pods. 



Leaves lobed; fruit of 2 pods 1. OPTJLASTER. 



Leaves toothed but not lobed; fruit usually of 5 pods .... 2. SPIRAEA. 

 Leaves compound, composed of 3 or more leaflets. 



Plants shrubby, sometimes armed with prickles or bristles. 



Plants neither prickly nor bristly; flowers yellow 4. POTENTILLA. 



Plants prickly or bristly or both; flowers white or pink. 



Flowers white; fruit like a raspberry or blackberry 11. RTJBTJS. 



Flowers pink; fruit red, smooth outside, open at the top, containing numerous 



seedlike achenes on the inside 12. ROSA. 



Plants herbaceous, unarmed. 

 .Leaflets 3 or 5, all attached at the end of the leaf stalk. 



Plants with runners or long creeping stems; petals white; fruit juicy. 

 Leaflets 3; fruit red and fleshy, bearing the seedlike achenes on the out- 

 side 6. FRAGARIA. 



Leaflets 5; fruit of a few small distinct 1-seeded drupes .... 11. RUBUS. 

 Plants without runners; petals yellow; fruit dry. 



Stamens 5; petals shorter than the sepals; plants 10 cm. high or smaller. 



7. SIBBALDIA. 

 Stamens usually 20; petals commonly much longer than the sepals; plants 



usually much more than 10 cm. high 4. POTENTILLA. 



Leaflets 5 or usually more, some of them attached along the side of the leaf stalk. 

 Achenes tailed or beaked in age. 



Achenes with hooked beaks 9- GETJM. 



Achenes with slender hairy tails 10. SIEVERSIA. 



Achenes neither tailed nor beaked. 



Style borne near the top of the achene; petals bright yellow or rarely purple; 



plants not sticky 4- POTENTILLA. 



Style borne near the base of the achene; petals pale yellow or nearly white; 

 plants with fine sticky hairs 5. DRYMOCALLIS. 



