640 ERICACEAE 



Sepals or calyx-lobes valvate in bud; corolla globose-urceolate ; shrubs; leaves 



neither imbricate nor scale-like. 6. Andromeda. 



Sepals imbricate in the bud; corolla campanulate; undershrubs, with scale-like 

 imbricate leaves. 7. Cassiope. 



Calyx and hypanthium accrescent, enclosing the capsule, berry-lili^e. 



8. Gaultherl\. 



Fruit a drupe or berry. 



Leaves thin, deciduous ; fruit juicy. 9. Arctoxjs. 



Leaves evergreen, leathery; fruit mealy. 10. Arctostaphtlos. 



1. LEDUM L. Labrador Tea. 



Resinous shrubs, with scaly buds and fragrant foliage. Leaves alternate, 

 thick and leathery, Tvith more or less revolute margins. Flowers in terminal 

 cor>Tnbs. Bracts deciduous. Calyx persistent; sepals 5. Petals 5, obtuse, 

 spreading, imbricate in the bud. Stamens 5-10, exserted; filaments filiform; 

 anthers didymous, the sacs opening by terminal pores. Disk annular, 8-10- 

 lobed. Ovary 5-celled, usually covered by scales; style filiform; stigma 5-lobcd. 

 Capsule oblong or ovate, 5-celIed, septicidally 5-valved from the base. 



Leaves densely ferrugtnous-tom^entose beneath and with strongly revohite margins. 



1. L. groenlandicum. 



Leaves glabrous on both sides, paler and glandular-punctate beneatli, not revolute. 



2. L,. glandulosum, 



1. L. groenlandicum Oeder. Shrub 3-10 dm. high, with rusty tomentose 

 twigs; leaf -blades oblong or elliptic, obtuse at both ends, 1.5-5 cm. long, 0.5-2 cm. 

 wide, dark green above, densely tomentose beneath, with rusty hairs; pedicels 

 2-2.5 cm. long, in fruit recurved; sepals minute, triangular; petals white, about 

 5 mm. long; capsule lance-ovoid, puberulent, 5-7 mm. long, 2-3 mm. thick. L. 

 latifolium Ait. In bogs: Greenl. — N.J. — Wash. — Alaska. Boreal — Subarctic, 

 Je-Jl. 



2. L. glandulosum Nutt. Slirub, 3-10 dm. high, with glabrous or minutely 

 puberulent branches; leaf-blades elliptic or oval, 1.5-3 cm. long, 1-2 cm. wide, 

 green above, pale and minutely resiniferous beneath; sepals oblong, obtuse, 

 about 1.5 mm. long; petals white, broadly oval, 5-7 mm. long; capsule ovoid, 

 4—5 mm. long, 3-4 mm. thick. Mountain swamps: B.C. — Calif. — Utah — Alta. 

 Mont — Subalp . Je- Au . 



2. AZALIASTRUM (Planch.) R,ydb. White Rhododendron, 



Azalea. 



Shrubs, with erect branches and deciduous leaves. Flowers perfect, in 1-3- 

 flowered umbels, from lateral scaly buds. Sepals 5, membrano-foliaceous. 

 Corolla open-campanulate or saucer-shaped, 5-lobed. Stamens 10,_ included; 

 filaments bearded at the base; anthers awnless, opening by terniinal pores. 

 Ovary 5-celled; style included; stigma peltate, 5-lobcd. Capsule ovoid, 5-celled, 

 septicidal. 



Leaves hirsute with brown hairs 



1. A. albiflorum 



Leaves glabrate, only gland ular-ciliokite on the margins. 2. A. Warremt. 



1. A. albiflorum (Hook.) Rydb. Shrub 0.5-2 m. high, with branches 

 glandular-strigose when young, in age glabrous; leaf-blades membranous, ob- 

 lanceolate, oval or oblong, pale green, 4-7 cm. long, 1.5-2 cm. wide; sepals oblong, 

 8-10 mm. long, glandular-pubescent, obtuse; corolla white, 12-20 mm. long; 

 lobes rounded; capsule woody, about 8 mm. in diameter. In woods: B.C. 

 Wash. — Mont. — Alta. MonL Jl-Au. 



2. A. Warrenii A. Nels. A low shrub, 3 dm. or less, with grayish bark on 

 the stem and browTi twigs; leaves ovate, oval, or obovate, 1-2 cm. long; flowers 

 axillary, sohtary or a few close together; sei>als narrowly elliptic, 7-10 mm. long, 

 covered with short gland-tipped hairs; corolla 10-15 mm. long, white; lobes 

 orbicular. Mountain slopes: Colo. Mont. Jl. 



3. PHYLLODOCE Salisb. Mountain Heath. 



Evergreen low branching shrubs, with alternate crowded leaves, thick, 

 grooved beneath, the margin revolute-thickened. Flowers in terminal umbels. 



