HEATH FAMILY 175 



Petals distinct, spreading; flowers from separate strobilaceous buds. 



1. Ledum. 

 Petals united, forming a gamopetaloiis corolla. 

 Corolla without sacs for the anthers. 



Corolla large, white, rotate or rotate-campanulate. 2. Az.\liastrum. 

 Corolla small, urceolate or campanulate. 



Heath-Uke evergreen undershrubs, with the flowers umbellately or 

 racemosely arranged at the ends of the branches, from the axils of 

 the leaves. 3. Phtllodoce. 



Deciduous-leaved shrubs, with the flowers from strobilaceous buds, 

 ending the branches of the preceding year. 4. AIENZIESI.\. 



Corolla rotate, with 10 sacs enclosing the anthers in bud. 



5. K.^LiMIA. 



Fruit loculicidal; the valves carrjong with them the partitions; anthers in our genera 

 awned. 

 Calyx and hjTDanthium neither accrescent, nor enclosing the capsule, nor berrv- 

 Uke. 

 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. C.a.ssiope. 



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



8. Gaultheria. 

 Fruit a drupe or berry. 



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



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



1. LEDUM L. Labrador Tea. 



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



1. L. groenlandicum. 

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



2. L. glandulosum. 



2. AZALIASTRUM (Planch.) Rydb. White Rhododendrox, 



Az.\LEA. 



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



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



3. PHYLLODOCE Salisb. Mountain He.\th. 



Corolla not contracted at the tliroat, open-campanulate, rose-colored to scarlet; sepals 

 obtuse. 1. P. empetriformis. 



Corolla urceolate, contracted at the throat, yellow; sepals acute. 2. P. glanduliflora. 



4. MENZIESIA Smith. 



Pedicels and petioles glandular -puberulent; seeds tailed at both ends; leaf-blades obtuse. 



1. M. glabella. 

 Pedicels and petioles glandular-lursute; seeds merely apiculate at the ends; leaf-blades 

 acute. 2. M. ferruginca. 



6. KALMIA L. American Laurel, Swamp Laurel. i. K. microphylla. 



6. ANDROMEDA L. Bog Rosemary. i. A. polifolia. 



7. CASSiOPE D. Don. Moss-plant, White Heather. 



Leaves with a deep furrow on the back. 1. C. tetragona. 



Leaves without fmrow on the back. 2. C. Mertensiana. 



8. GAULTHERIA (Kahn) L. Creeping Wintergreen. 



Glabrous; leaves oval or orbicular. 1. G. humifusa. 



Calyx, pedicels, and upper part of the stem sparingly hirsute ; leaves ovate. 



2. G. ovatifolia. 



9. ARCTOUS (A. Gray) Niedzu. Alpine Bearberry. 



Fruit black; corolla-lobes ciliate; leaves less than 3 cm. long. 1. A. alpina. 



Fruit red; corolla-lobes not ciliate; leaves usually more than 3 cm. long. 



2. A. erythrocarpa. 



10. ARCTOSTAPHYLOS Adans. Bearberry, Kinnikinick, 



M.VNZANITA. 



Depressed creeping glabrous plant, with spatulate leaves. 1. A. Uva-ursi. 

 Erect sluTibs or trees, 1-6 m. liigh, with oval leaves. 



Young branches puberulent; leaves usually pungent-cuspidate. 2. A. pungens. 



Branches glabrous; leaves usually not cuspidate. 3. .4. platyphylla. 



