ROSE FAMILY 1 23 



Berry purple, ^ in. in diameter, beset with stout spines. 

 (R. amictum Greene.) — Plentiful at middle altitudes. 



R. amarum McCl. has been collected at Footman Mt. and 

 may reach our lower borders. It has larger leaves than R. 

 roezli (1 to 2 in. wide), and the numerous bristles of the 

 ovary and berry are gland-tipped. It is also called R. mari- 

 posanum Congdon. 



6. R. lasi&nthum Greene. Distinguished from no. 5 by the 

 paler and often smaller leaves, the smaller yellowish flowers 

 and the merely granular ovary which matures into a smooth 

 berry. — High altitudes, as at Merced Lake. 



ROSACEAE. Rose Family. 

 Herbs and shrubs with alternate, simple or compound 

 leaves and usually evident stipules. Flowers regular. Calyx 

 5-lobed, sometimes with 5 small accessory lobes. Petals 5 

 or none. Stamens 5 to numerous, inserted with the petals 

 on the calyx. Pistils 1 to many, various. 



A. Leaves compound, with 3 to numerous leaflets. 



Fruit fleshy or pulpy, called a berry or hip. 



Stems woody, not prickly; erect shrub 3. Pirus. 



Stems woody, prickly. 



Flowers white 5. Rubus. 



Flowers pink 14. Rosa. 



Stems herbaceous, creeping, not prickly 6. Fragaria. 



Fruit dry, not berry-like. 



Pistil only 1; stamens 15; flowers white 9. Stellariopsis. 



Pistils 3 to IS or numerous. 



Stamens 5; leaflets 3; petals yellow 10. Sibbaldia. 



Stamens 5 to 15, inserted near throat of calyx, dis- 

 tant from the receptacle; leaflets more than 3... 8. Horkelia. 

 Stamens 20 or more, inserted on base of calyx near 

 the receptacle. 



Styles straight, falling from the mature ovary 7. Potentilla. 



Styles hooked (or feathery), persistent 11. Geum. 



B. Leaves simple (dissected into many small lobes in Chamaebatia; all 

 woody plants). 



a. Pistils numerous; leaves large, palmately lobed. .Rubus parviiiorus, p. 125. 



b. Pistils about 5, becoming several-seeded pods; flowers 



rose-color 1. Spiraea. 



c. Pistils 5, becoming 1-seeded dry fruits; flowers white.. 2. Holodiscus. 



d. Pistil 1. 



Leaves finely cut into small lobes 12. Chamaebatia. 



Leaves simply toothed or entire. 

 Petals none; pistil becoming a feathery-tailed akene..l3. Cercocarpus. 

 Petals white. 



Ovary superior; fruit a cherry 15. Prunus. 



Ovary inferior; fruit berry-like 4. Amelanchier. 



