ROSE FAMILY I2J 



a slight bloom; petals mostly larger than in the species, 

 often nearly twice as long as the calyx. Var. platypetala 

 f. sibbaldifolia Hall is a sub-alpine form of small size, the 

 leaflets ^ to 1 in. long, toothed only around the summit, 

 the lateral ones nearly sessile. It grows on Mt. Dana and 

 elsewhere toward timber-line, but as one descends he finds 

 the plants becoming larger and larger, gradually taking on 

 the characters of var. platypetala. 



7. POTENTILLA. 



Annual and perennial herbs, one species a low shrub, with 

 compound leaves. Flowers yellow or whitish, in terminal 

 clusters or solitary, never sessile. Calyx nearly flat to cup- 

 shaped, with 5 main teeth alternating with 5 tooth-like bract- 

 lets. Petals 5, broad, obtuse, often notched. Stamens at 

 least 20, inserted on a thickened ring near base of calyx; 

 filaments thread-like. Pistils 10 to 80, on a conical receptacle 

 which does not become fleshy or juicy, each pistil maturing 

 into a dry seed-like akene. 



Stems erect and woody; low shrub of high altitudes 1. P. fruticosa. 



Stems creeping and rooting in wet places 2. P. anserina. 



Stems erect or reclining, neither woody nor rooting from the 

 joints. 

 Leaflets 3. 



All 3 leaflets sessile or short-stalked 3. P. Aabellifolia 



Terminal leaflet long-stalked 4. P. grayi. 



Leaflets 5 or more, all from summit of petiole. 



Stems mostly 1 ft. or more high 5. P. gracilis. 



Stems ^ to 1 ft. high 6. P. dissecta. 



Leaflets 5 or more, scattered along the petiole. 



Herbage white with soft cottony hairs 7. P. breweri. 



Herbage green, more or less viscid-pubescent. 



Flowers yellow 8. P. glandnlosa. 



Flowers white or cream-color when fresh 9. P. lactea. 



1. P. fruticosa L. Shrubby Cinquefoil. Leaves r / 2 to Y\ 

 in. long, on petioles of Yi in. or less, much crowded, white 

 silky-pubescent beneath; leaflets 3 to 7, pinnately arranged 

 but very crowded, oblong, entire, Y i n - or less long. Flowers 

 yellow, ^ to 1 in. across, the petals orbicular. (Dasiphora 

 fruticosa Rydb.) 



As indicated by its name, this is a true shrub. The very 

 leafy branches, with a shreddy, reddish bark, and the large, 

 yellow flowers render it an attractive object at about timber- 

 line on the higher mountains. It is plentiful on Mt. Dana, 

 Mt. Lyell, etc., its range extending thence northward to 

 Alaska and around the world in sub-arctic regions. 



