640 ERICACE.\E 



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



neither imbricate nor scale-hke. 6. Andromeda. 



Sepals imbricate in the bud; coroUa campanidate; undershrubs, with scale-like 

 imbricate leaves. 7. Cassiope. 



Calyx and hypanthium accrescent, enclosing the capsule, berry-Uke. 



8. Gaultheria. 

 Fruit a drupe or berry. 



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



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



1. LEDUM L. Labrador Tea. 



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

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

 corj-mbs. Bracts deciduous. Calyx persistent; sepals 5. Petals o, obtuse, 

 spreading, imbricate in the bud. Stamens 5-10, e.xserted; filaments fiUform; 

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

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

 Capsule oblong or ovate, o-celled, septicidally o-valved from the base. 



Leaves densely ferruginotis-tomentose beneath and with strongly revolute margins. 



1. L. groenlandicum. 

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



2. L. glandulosum. 



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

 t^igs; leaf-blades oblong or eUiptic, 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. 

 J(^J1. 



2, L. glandulosum Xutt. Shrub, 3-10 dm. high, with glabrous or minutely 

 puberulent branches; leaf-blades eUiptic or oval, 1.5-3 cm. long, 1-2 cm. -^vide, 

 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.) Rydb. White Rhododendron, 



Azalea. 



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

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

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

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

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

 septicidal. 



Leaves hirsute with brown hairs. 1. A. albiflorum. 



Leaves glabrate, only glandular-cUiolate on the margins. 2. A. Warrenii. 



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

 glandular-strigose when yoimg, 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 woodv, about 8 mm. in diameter. In woods: B.C. — 

 Wash.— Mont.— Alta. Mont~ Jl-Au. 



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

 the stem and brown t'wigs; leaves ovate, oval, or obovate, 1-2 cm. long; flowers 

 axillarj', solitary or a few close together; sepals narrowly elhptic, 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. 



