A large family of shrubs and herbs; leaves simple, oblong or linear, deciduous or evergreen; flowers racemose, corymbose or solitary, regular, mostly perfect, without stipules, sometimes from scaly buds; fruit a capsule, berry or drupe.

Subfamily Pyroloideae

Tribe Pyroleae

I. Chimaphila. Pursh.

1. C. umbellata. (L.) Nutt. Pipsissewa. 2. C. Menziesii. Spreng. Spotted Prince's Pine. II. Moneses. Salisb.

1. M. uniflora. (L.) Gray. One-Howered Winter green. III. Pyrola. (Tourn.) L.

1. P. chlorantha. Sw. Green-Howered Wintergreen.

2. P. secunda. L. One-sided Wintergreen.

3. P. minor. L. Small Wintergreen.

4. P. asarifolia. Michx. Bog Wintergreen.

5. P. asarifolia var. incarnata. (Fisch.) Fernald. Red Wintergreen.

Subfamily Monotropoideae

IV. Allotropa. T. and G.

1. A. virgata. T. and G. Striped Allotropa. V. Monotropa. L.

1. M. uniflora. L. Indian Pipe.

2. M. Hypopitys. L. Pinesap. VI. Pterospora. Nutt.

1. P. Andromedea. Nutt. Pine Drops. VII. Newberrya. Torr.

1. N. congesta. Torr. Newberrya.

Subfamily Ericoideae

Tribe Rhododendreae

VIII. Ledum. L.

1. L. grcenlandicum. Oeder. Woolly Labrador Tea.

2. L. glandulosum. Nutt. Smooth-leaved Labrador Tea. IX. Rhododendron. L.

1. R. albiflorum. Hook. Mountain Rhododendron. X. Menziesia. Sm.

1. M. glabella. Gray. Smooth Menziesia.

2. M. ferruginea. Smith. Scaly Menziesia. XI. Loiseleuria. Desv.

1. L. procumbens. (L.) Desv. Trailing Alpine Azalea. XII. Kalmia. L.

1. K. polifolia. Wang. Swamp Laurel.

Tribe Andromedeae

XIII. Bryanthus. Gmel.

1. B. empetriformis. Gray. Red Mountain Heather.

2. B. glanduliflorus. Gray. White Mountain Heather.

3. B. intermedius. (Hook.) Rydb. Pink Mountain Heather.

XIV. Cassiope. D. Don.

1. C. Mertensiana. (Bong.) Don. White Heath. 2. C. tetragona. Don. Four-angled Heath. XV. Gaultheria. (Kalm.) L.

1. G. ovatifolia. Gray. Red-berried Gaultheria. 2. G. humifusa. (Graham.) Rydb. Creeping Gaultheria.

Tribe Arbuteae

XVI. Arctostaphylos. Adans.

1. A. Uva-ursi. (L.) Spreng. Red Bearberry.

2. A. alpina. (L.) Spreng. Alpine Bearberry.

3. A. tomentosa. Dougl. Manzanita.

Subfamily Vaccinoideae

XVII. Vaccinuium. L.

1. V. ovalifolium. Sm. Oval-leaved Blueberry.

2. V. membranaceum. Dougl. Black Blueberry.

3. V. caespitosum. Michx. Dwarf Bilberry.

4. V. Vitis-Idsea. L. Mountain Bilberry.

5. V. erythrococcum. Michx. Alpine Bilberry.

6. V. Oxycoccus. L. Small Cranberry.