HEATH FAMILY 175 



Petals distinct, spreading; flowers from separate strobilaceous buds. 



1. Ledum. 

 Petals united, forming a gamopetalous corolla. 

 Corolla without sacs for the anthers. 



Corolla large, white, rotate or rotate-campanulate. 2. Azaliastrdm. 

 Corolla sm^l, urceolate or campanulate. 



Heath-like evergreen undershrubs, with the flowers vuubellately 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. Menziesia. 

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



S. Kalmia. 

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

 awned. 

 Calyx and hypanthlum neither accrescent, nor enclosing the capsule, nor berry- 

 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. Oassiope. 



Calyx and hypanthlum accrescent, enclosing the capsule, berry-lUce. 



8. Gaultheria. 

 Fruit a drupe or beny. 



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



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



1. LEDUM L. Labrador Tea. 



Leaves densely ferruginous-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. 



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



Azalea. 



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



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



3. PHYLLODOCE Salisb. Mountain Heath. 



Corolla not contracted at the throat, 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-hirsute; seeds merely aplculate at the ends; leaf-blades 

 acute. 2. M. ferruginea. 



5. KALMIA L. American Laurel, Swamp Laurel. i. K. microphyila. 



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



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



Leaves with a deep fm'row on the back. 1. C. telragona. 



Leaves without furrow on the back. 2. C. Meriensiana. 



8. GAULTHERIA (Kalm) 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 cillate; leaves less than 3 cm. long. 1. A. alpina. 



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



2. A. erythrocarpa. 



10. ARCTOSTAPHYLOS Adans. Bearberry, Kinnikinick, 

 Manzanita. 



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

 Erect shrubs or trees, 1-6 ra. high, with oval leaves. 



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



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



