ERICACEAE (HEATH FAMILY) 173 



RHODODENDRON 



Leaves evergreen or deciduous, alternate, entire or nearly so. Flowers 

 white or rose-colored or purple, large, in terminal umbels or lateral fascicles. 

 Calyx 5-parted or -lobed. Corolla funnelform or campanulate, 5-lobed, 

 regular or slightly 2-lipped. Stamens 5 or 10; anther cells opening by 

 pores. Ovary 5~2o-celled. Capsule 5~20-valved from tip. Seeds many, 

 minute. (Gk. rhodon = a rose ; dendron a tree ; hence rose tree.) 



A. Leaves thick, coriaceous, evergreen; corolla rose-colored. W. C. 



R. californicum (RHODODENDRON) 



AA. Leaves of ordinary thickness, not coriaceous, deciduous; corolla white or yel- 

 lowish. 



B. Leaves lanceolate or oblong; flowers in lateral clusters of 1-3; corolla 1.5-2 cm. 



long; stamens 10; capsule 6-8 mm. long. W. C. E. R. albiflorum (SMALL AZALEA) 



BB. Leaves obovate-oblong; flowers in terminal umbels; corolla about 5 cm. long; 



stamens 5; capsule 16-25 mm. long. U. R. occidentalis (LARGE AZALEA) 



PHYLLODOCE (HEATHER) 



Low. Leaves crowded. Calyx 4-6-parted. Corolla campanulate or 

 ovoid, 5-lobed. Stamens 10. Capsule 5-celled, globose to short-oblong, 

 septicidal, 5-valved. Seeds many, minute. (Phyllodoce was a sea-nymph 

 mentioned by Virgil.) 



A. Corolla red, campanulate. W. C. E. P. empetrifonnis (RED HEATHER) 



AA. Corolla yellowish, ovoid. W. C. E. P. glanduliflora (YELLOW HEATHER) 



CASSIOPE (Moss HEATHER) 



Low, matted. Leaves sessile, entire, apparently veinless, 4-ranked. 

 Flowers peduncled, nodding, white or pink. Sepals 4 or 5. Corolla 4-5- 

 lobed or -parted. Stamens 8 or 10 ; anther cells opening by pores, tipped 

 with a recurved awn. Capsule globose or ovoid,' 4~5-celled, 4~5-valved. 

 Seeds many, minute. (Cassiope was the mother of Andromeda.) 



A. Leaves furrowed on the back. C. C. tetragona 



AA. Leaves keeled on the back. W. C. E. C. mertensiana 



GAULTHERIA 



Leaves wide. Flowers small, nodding, either solitary in the leaf axils or 

 in axillary racemes. Calyx 5-cleft or -lobed. Corolla urn-shaped to cam- 

 panulate. Stamens 10; anther-cells opening by a pore at tip. Ovary 

 5-celled. Berry composed of the fleshy calyx inclosing the ovary. (Honor 

 of H. Gaulthier, a French naturalist, court physician at Quebec.) 



A. Plant 3-30 dm. high; leaves 2.5-10 cm. long; corolla urn-shaped; filaments 

 hairy; fruit black. W. C. G. shallon (SALAL) 



AA. Plant 0.5-2 dm. high; leaves 3.7 cm. or less long; corolla campanulate; fila- 

 ments glabrous; fruit scarlet. 



