228 University of California Puhlications in Botany [Vol. 9 



30. ROSACEAB (Rose Family) 



Leaves simple. 



Pistils numerous; leaves deeply palmately lobed 1. Rubus 



Pistils solitary; leaves small and merely dentate or entire. 



Apetalous; pistils persistent and plumose 2. Cercocarpus 



Petals present. 



Ovary superior; fruit a drupe 3. Prunus 



Ovary inferior; fruit a pome 4. Amelanchier 



Pistils 5. 



Fruit an achene; flowers white 5. Holodiscus 



Fruit a several-seeded follicle; flowers reddish 6. Spiraea 



Leaves compound. 



Tall shrubs 7. Pyxus 



Herbs or low shrubs. 

 Fruit dry. 



Pistils 3-many; anthers opening by longitudinal slits. 



Stamens many (20 or more), borne on the base of the calyx close to 

 the receptacle. 



Style straight, naked and deciduous 8. Potentilla 



Style hooked or plumose and persistent 9. Geum 



Stamens 10-20, borne near the throat of the calyx and distant from 

 the receptacle. 



Filaments broad and petaloid 10. HorkeUa 



Filaments filiform 11. Ivesia 



Stamens 5; leaves trifoliate; flowers yellow 12. Sibbaldia 



Pistil solitary; anthers opening by terminal pores 13. Stellariopsls 



Fruit fleshy; leaves trifoliate; flowers white 14. Fragaria 



1. RUBUS 



1. Rubus parviflorus Nutt. Gen., vol. 1, p. 308. 1818. 



B. nuthanus Moc, in DC, Prodr., vol. 2, p. 566. 1825. 



Eubacer parviflorum (Nutt.) Rydb., Bull. Torr. Bot. Club, vol. 30, p. 274. 

 1903. 



Type locality. — "On the island Michilimackinak, Lake Huron." 



Range. — Widely distributed in western North America from south- 

 eastern Alaska to the Great Lakes, southward to Mexico. 



Zone. — Transition and lower Canadian. 



Specimens examined. — Glen Alpine, Eldorado County, 7,000 feet, 

 W. W. Price, July, 1898 ; Grass Lake, Tahoe, McGregor 4 ; ravine near 

 Fallen Leaf Lake, Tahoe, 7,000 feet, Smiley 361. 



This shrub is here included because, though mainly Transition 

 in its zonal position, it is so abundant in certain places in the Piniis 

 Jeffreyi division of the Canadian life-zone. 



2. CERCOCARPUS 



1. Cercocarpus ledifolius Nutt., in T. and G., FL, vol. 1, p. 427. 

 1840. 



Type locality. — "Rocky Mountains, in alpine situations on the 

 summits of the hills of Bear River of Timpanagos. " 

 Range. — Pacific Coast east to Montana and Colorado. 



