42 SPRING FLORA 



Pistils 1-5, becoming follicles in 



fruit 5. Physocarpiis 



Pistils numerous, becoming aggregated 



drupelets 6. Rubiis 



Herbs. 



Styles deciduous; neither jointed nor elong- 

 ating in fruit. 

 Leaves palmately 3-foliate; flowers 



white 7, Fragrariu 



Leaves pinnate; flowers yellow or cream- 

 color 8. Poteiitilla 



Styles persistent; jointed and elongating in 



fruit 9. Ceum 



Ovary wholly "inferior." (Shrubs or small trees.) 



Pistils several, simple, included in the urn-shaped 



receptacle; leaves pinnate 10. Rosa 



Pistil 1, compound, with 2-5 cells (as many as the 

 styles) ; leaves simple. 



. Flowers racemose; fruit juicy 11. Amelanchier 



Flowers corymbose; fruit rather dry 12. Crataegus 



1. CERCOCARPUS. Mountain Mahogany. 



Leaves alternate, simple; entire or toothed; evergreen; 

 leathery. Flowers from winter-buds; small; solitary or fas- 

 cicled in the axils of the leaves. Calyx without bractlets: 

 colored like a corolla. Corolla none. Stamens 15-25, inserted 

 in 2-3 rows on calyx-tube. Carpel included, ripening into an 

 achene, the persistent style becoming much lengthened and 

 villous. 



1. C. I (Milfoil us Nutt. 6-15 ft. high. Leaves oblong-lance- 

 olate; glabrous, smooth and shining above but more or less 

 tomentose below; margins entire, rolled under. Flowers ses- 

 sile, tomentose. The persistent style becomes spirally twisted 

 and from 2 to 3 inches long in fruit. On mountain sides, 

 7,000-9,000 ft. April-June. 



la. C. ledifolium intricatus (Wats.) Jones. (C. intricatus 

 Wats.) A low, intricately-branched shrub, seldom more than 

 3 ft. high, with linear leaves and smaller flowers and fruits 

 than the type. 



2. PURSHIA. (Kunzia.) Antelope Brush. 



Shrubs similar to Cowania, but differing as follows: The 

 wedge-shaped leaves have a 3-5-lobed apex and entire sides; 

 petals drop off more quickly; stamens in 1 row; carpel I or 

 sometimes 2, the fruiting styles not plumose and not more 

 than % inch long; body of achene exserted. 



1. P. tridentata DC. Buck Brush; Bitter Brush. Seldom 

 more than 6 ft. high. Bark brown or grayish. Carpels pu- 

 bescent. Dry plains and mountain sides, 4,600-6,500 ft. May- 

 June. 



3. PRTJNTJS. Cherry; Plum. 



Shrubs or small trees with simple and usually serrulate 

 leaves which bear free and deciduous stipules. Flowers white; 

 fascicled in the axils, or in terminal racemes. Calyx 5-cleft; 

 deciduous. Petals 5. spreading. Stamens 15-25. Carpel 1 

 (rarely 5), ripening into a drupe. Ovules 2, 



