642 ERICACEAE 



long, 5-10 mm. wide, oval, glabrous, dark green above, glaucous beneath, some- 

 what re volute on the margins; sepals ovate, concave, about 3 mm. long; purple; 

 corolla bluish purple, 10-14 mm. wide. Cold bogs: Alaska Calif. Colo. 

 Alta. Mont. Subalp. Je-Au. 



6. ANDROMEDA L. BOG ROSEMARY. 



Glabrous evergreen shrubs, with coriaceous, entire, revolute-margined leaves. 

 Flowers perfect, in terminal umbels. Sepals 5, persistent. Corolla globose- 

 urceolate, 5-toothed, with recurved teeth. Stamens 10, included; filaments 

 bearded, unappendaged ; anthers short, ovate, obtuse ; sacs opening by a terminal 

 pore, each with an ascending awn. Disk 10-lobed Ovary 5-celled; style 

 columnar; ovules many. Capsule subglpbose, 5-angled, 5-valved, loculicidal. 

 Seeds with smooth testa, coriaceous, shining. 



1. A. polifolia L. Shrub, 1-3 m. high, with acid foliage; leaf -blades oblong 

 to linear, 3-5 cm. long, 3-8 mm. wide, dark green above, white beneath, mucronu- 

 late, the margins usually strongly revolute; bracts ovate, glaucous; pedicels 5-10 

 mm. long; sepals triangular, acute, about 1 mm. long; corolla pink, about 9 mm. 

 long. In swamps: Lab. N.J. Ida. Wash. Alaska; Eurasia. Je-Jl. 



7. CASSIOPE D. Don. MOSS-PLANT, WHITE HEATHER. 



Evergreen low branching shrubs, with thick, opposite, crowded, imbricate, 

 4-ranked leaves and axillary nodding flowers. Sepals usually 5, not bracted, 

 imbricate, thickened at the base. Corolla campanulate, usually 5-lobed. 

 Stamens 8-10, included; anthers attached to the filaments near the apex; sacs 

 opening by large terminal pores and tipped with recurved awns. Disk 10- 

 crenate. Ovary 4-5-celled; style slender, somewhat thickened below. Capsule 

 globose or ovoid, loculicidal, 4-5-valved. 



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



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



1. C. tetragona (L.) D. Don. Tufted shrub, with erect or ascending 

 branches, 1-3 dm. high; leaves very thick, ovate, 2-5 mm. long, more or less 

 pubescent; peduncles 1-2.5 cm. long, glabrous or nearly so; sepals ovate, 2-2.5 

 mm. long, acute; corolla white or rose-colored, 5-6 mm. long. Wet places: 

 Greenl. Lab. B.C. Alaska; Eurasia. Subalp. Alp. Jl-Au. 



2. C. Mertensiana (Bong.) D. Don. Tufted shrub, with ascending branches, 

 1-3 dm. high; leaves ovate, 2-4 mm. long, round-keeled on the back, glabrous 

 or nearly so; peduncles 1-1.5 cm. long, glabrous or puberulent; sepals 2-3 mm. 

 long, ovate, usually pinkish, acute; corolla 5-8 mm. long, white or slightly tinged 

 with rose. Wet places^ in the mountains: Alaska n Calif. Mont. Alta. 

 Subalp. Alp. Jl-Au. 



8. GAULTHERIA (Kalm) L. CREEPING WINTERGREEN. 



Shrubs or undershrubs, with alternate evergreen leaves. Flowers perfect, 

 solitary, axillary, or in axillary racemes. Hypanthium and calyx enlarging and 

 becoming fleshy, enclosing the capsule and forming a berry-like fruit. Sepals 5. 

 Corolla campanulate or urn-shaped. Stamens 10; filaments dilated below, in- 

 cluded; anther-sacs opening by terminal pores, 2-awned or 2-pointed. Disk 

 10-toothed. Ovary and capsule 5-celled, 5-lobed. 



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



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



2. G. ovatifolia. 



1. G. humifusa (Graham) Rydb. Cespitose, depressed, procumbent 

 undershrub, 3-10 cm. high, glabrous; leaf -blades finely crenate or entire-margined, 

 1-2 cm. long; corolla open-campanulate, 5-lobed, white, about 3 mm. long; fila- 

 ments glabrous; fruit scarlet, 5-6 mm. in diameter. G. Myrsinites Hook. Wooded 

 mountain sides: B.C. Calif. Colo. Alta. Submont. Subalp. Jl. 



2. G. ovatifolia A. Gray. Low depressed shrub, 1-2 dm. high, with more 

 or less hirsute stems; leaf -blades ovate, acute, serrate, glabrous, rather thick, 



