HEATH FAMILY 19 



Corolla sympetalous (as in all the following). 



Large shrubs with broad leaves; leaf -buds scaly. 



Corolla funnelform, 5-lobed 2. Rhododendeon. 



Corolla cylindric-urnshaped, 4-lobed 3. Menziesia. 



Diminutive alpine or subalpine shrubs with narrow small leaves; no scaly leaf- 

 buds. 



Corolla saucer-shaped with 10 pockets holding the anthers i. Kalmia. 



Corolla open-eampanulate, without pockets 5. Phyllodoce. 



Antliers awned or mucronate ; capsule loculicidal. 



Corolla cup-shaped; anthers awned; leaves scale-like, imbricated, sessile 



6. Cassiope. 

 Corolla ovate with narrow orifice ; anthers not awned, merely mucronate ; leaves 



broad, petioled 7. Leucothoe. 



Fruit a berry or drupe. 



Calyx tubular, becoming fleshy in fruit and enclosing the capsule; anthers awned or awn- 

 less; flowers in a raceme or solitary 8. Gatiltheria. 



Calyx with distinct sepals, dry, persistent in fruit but insignificant; anthers awned ; fruit 

 a berry or berry-like. 

 Surface of fruit granular or warty. 



Flowers in a panicle; calyx glabrous 9. Arbutus. 



Flowers in a raceme; calyx tomentose 10. Comarostaphtlis. 



Surface of fruit smooth or sometimes merely glandular ; flowers in a panicle, rarely 



in a raceme 11. Arctostaphylos. 



Ovary wholly inferior. — Subfamily Vaccinieae 12. Vaccinium. 



B. Herbs or herb-like plants; coroUa choripetalous (except nos. 19, 20 and 21) ; anthers 



■without awns (except no. 19) . 



Plants with evergreen leaves (one species leafless); leaves in whorls or basal; corolla chori- 

 petalous. — Subfamily Pyrolineae. 

 Stems leafy; flowers corymbose; filaments with a conspicuous roundish dilation; style short. 



13. Chimaphila. 

 Stems leafy at base only ; filaments not dilated ; style commonly elongated. 



Flowers solitary; stigma with 5 radiating lobes 14. Moneses. 



Flowers racemose; stigma 5-lobed or -toothed 15. Pyrola. 



Humus plants or saprophytes without green leaves; leaves replaced by alternate scales. — Sub- 

 family MONOTROPEAE. 

 Ovary 4 to 7-celIed. 



Corolla none ; stems streaked red and white 16. Allotropa. 



Corolla present. 



Corolla choripetalous ; ovary seated on an 8 to 12-toothed disk, the teeth deflexed. 



Stems 1-flowered 17. Monotropa. 



Stems several-flowered 18. Hypopitys. 



Corolla sympetalous ; disk none. 



Anthers awned; corolla 2% lines long 19. Pterospora. 



Anthers not awned; corolla 6 to 9 lines long 20. Saecodes. 



Ovary 1-celled. 



Corolla sympetalous; sepals mostly 2; flower parts hairy 21. Newberrya. 



Corolla with distinct petals ; sepals 4 or 5, glabrous. 



Filaments glabrous; corolla glabrous; inflorescence a dense spike 



22. Pleuricospoea. 

 FUaments hairy; corolla hairy within; inflorescence a pyramidal raceme 



23. PiTYOPUS. 



1. LEDUM L. Labrador Tea 



Evergreen shrubs with fragrant herbage. Leaves alternate, entire, the margin 

 disposed to be revolute. Flowers white, small, in terminal umbel-like corj^mbs 

 from large scaly buds. Pedicels slender. Sepals 5, almost distinct, very small. 

 Petals 5, distinct, obovate, spreading. Stamens 5 to 10. Capsule 5-celled, dehiscing 

 from the base upward, many-seeded; placentae borne on the summit of the axis of 

 the fruit. — Species 3, North America, Europe and Asia. (Greek Ledon, ancient 

 name of the Cistus.) 



1. L. glandulosum Nutt. Trappers Tea. (Fig. 280.) Low, 2 to 5 feet high; 

 leaves thickly clothing the stems, the blades oblong, acute at each end, mucronate 

 at apex, 1 to 2% inches long, green and glabrous on both sides, or light-colored 



