HEATH FAMILY 641 



perfect. Sepals normally 5, imbricate, persistent. Corolla open-camps nu- 

 late to urn-shaped, 5-lobed. Stamens 10, included; anthers dehiscent by oblique 

 chinks. Ovary 5-celled; style filiform; stigma capitate or obscurely 5-lobed. 

 Capsule subglobose, septicidal, 5-valved to the middle; seeds numerous, with 

 coriaceous testa. 



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. 



1. P. empetriformis (Smith) G. Don. Branched shrub, 1-3 dm. high; leaves 

 subsessile, linear, rather crowded on the branches, 5-12 mm. long, 1-1.5 mm. 

 wide, thick, grooved on both sides, glabrous, scabrous, denticulate on the margins; 

 sepals oblong or ovate, obtuse, about 2 mm. long, usually pink or scarlet; corolla 

 6-8 mm. long, glabrous. RED OR PURPLE HEATHER. Mountain sides and 

 swamps: Alaska n Calif. Colo. Alta. Subalp. Alp. Jl-Au. 



P. empetrif ormis X glanduliflora. Where the two species grow together, hybrids often 

 occur. These are of two forms, both having cylindraceous corolla. On one, P. inter- 

 media (Hook.) Rydb., the corolla is pink and the sepals acute, in the other, P. hybrida 

 Rydb., the corolla is yellowish and the sepals obtuse. 



2. P. glanduliflora (Hook.) Coville. Branched shrub, 1-3 dm. high; leaves 

 subsessile, linear-oblong, obtuse, 4-8 mm. long, 1.5-2 mm. wide, otherwise as in 

 the preceding; sepals lanceolate, very acute, 4-5 mm. long, glandular-hairy; 

 corolla about 8 mm. long, sulphur-yellow and more or less glandular-puberulent. 

 YELLOW HEATHER. Mountain sides and swamps: Alaska Wash. Wyo. 

 Alta. Subalp. Alp. Je-Au. 



4. MENZIESIA Smith. 



Shrubs, with erect branching stems and alternate deciduous leaves. Flowers 

 perfect, in terminal clusters from early buds. Calyx 4-5-lobed, often obsolete. 

 Corolla urn-shaped, campanulate or globose, usually 4-lobed. Stamens 5-10, 

 mostly 8, included; filaments subulate, flattened; anthers linear-sagittate, awn- 

 less, opening by terminal oblique pores or chinks. Disk 8-10-lobed. Ovary 

 4- (rarely 5-) celled; style included; stigma truncate, with 4 or 5 lobes. Capsule 

 septicidal, 4-valved. 



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



1. M. glabella. 



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

 acute. 2. M. ferruginea. 



1. M. glabella A. Gray. Erect shrub, 2-3 m. high; leaf -blades obovate or 

 elliptic, 3-6 cm. long, 1-3 cm. wide, green and sparingly short-hairy above, gla- 

 brous or nearly so and pale beneath; corolla urceolate, 8-9 mm. long; capsule 

 ovoid, about 6 "mm. long, glabrous or minutely puberulent. Woods: B.C. Ore. 

 Wyo. Alta. Submont. Je-Jl. 



2. M. ferruginea Smith. Erect shrub, 2-3 m. high; leaf-blades broadly 

 oblanceolate, hirsute-strigose and green above, pale and glabrous beneath, 

 except the veins and margin, 3-5 cm. long, 1-2.5 cm. wide; corolla cylindro- 

 urceolate, 8-10 mm. long, 6-^7 mm. wide; capsule ovoid, about 8 mm. long, 

 glabrous or with scattered hairs. M. urceolaria Salisb. Woods: Alaska Ore. 

 Wyo. Mont. Submont. Mont. My-Jl. 



5. KALMIA L. AMERICAN LAUREL, SWAMP LAUREL. 



Evergreen shrubs or trees, with alternate, opposite, or whorled leaves. Flowers 

 perfect, in terminal or axillary corymbs or umbels, with early deciduous bracts. 

 Sepals 5, persistent, leathery. Corolla rotate, pink or white, with 10 pouches 

 at first enclosing the anthers, 10-keeled and rounded 5-lobed. Stamens 10; 

 filaments shorter than the corolla, straightening elastically at maturity; anthers 

 awnless, opening by terminal pores. Disk 1-lobed. Ovary 5-celled. Capsule 

 globose, depressed at the apex, septicidal, 5-valved. 



1. K. microphylla (Hook.) Heller. Low branched shrub, 1-3 dm. high; 

 leaves opposite, with very short petioles; leaf-blades 1-1.5 cm., seldom 2.5 cm. 





