298 ERICACEAE 



1. CLADOTHAMNUS Bong. Mem. Acad. St. Petersb. VI. 2: 155. 1832. 



Shrubs with erect stems. Leaves deciduous, alternate, scattered or often crowded at 

 the ends of the branchlets, thin and entire. Flowers perfect, solitary or in few-flowered 

 axillary corymbose clusters. Calyx rotate, the lobes 5, narrow, much exceeding the very 

 short tube. Petals distinct, 5, narrow, spreading in anthesis. Stamens 10, shorter than the 

 petals, declined ; filaments subulate ; anthers much shorter than the filaments, opening from 

 the apex almost to the base by a longitudinal slit. Ovary 5-6-celled, depressed, septi- 

 cidally 5-6-valved; style elongated; stigma capitate. [Name from two Greek words mean- 

 ing branch and bush.] 



A monotypic genus of northwestern America. 



l.Cladothamnus pyrolaefldrus Bong. Cladothamnus. Fig. 3670. 



Cladothamnus pyrolacfiorus Bong. Mem. Acad. St. Petersb. VI. 2: 155. 1832. 

 Tolmiea occidentalis Hook. Fl. Bor. Amer. 2: 44. 1834. 



Erect shrub, up to 2 m. high, the young branchlets brownish, glabrous. Leaves oblanceolate 

 to oblong-oblanceolate, 15-45 mm. long, obtuse or rounded at the apex, narrowed below to a 

 short petiole, entire, light green and very thin; pedicels slender, about 15 mm. long, glabrous 

 or sometimes sparsely puberulent ; calyx-lobes herbaceous, 4-5 mm. long, ciliolate; petals 10 mm. 

 long, oblong-oblanceolate, copper-colored; capsule 5 mm. high, depressed-globose. 



Growing near timber line, Hudsonian Zone; Alaska to northwestern Oregon. Rare in the Pacific States; the 

 only known localities are: Mount Baldy, Olympic Mountains, and Mount Baker and Mount Shuskan, Whatconx 

 County, Washington; Saddle Mountain, Clatsop County, Oregon. Type locality: Sitka, Alaska. 



2. LEDUM L. Sp. PI. 391. 1753. 



Erect branching shrubs with resinous fragrant foliage. Leaves alternate, leathery and 

 persistent, linear or oblong, entire. Flowers perfect, in terminal umbel-like racemes from 

 large scaly buds, the new growth of the season originating at the base of the flower 

 clusters. Pedicels erect in anthesis, nodding in fruit. Calyx very small, rotate, 5-lobed. 

 Petals 5, distinct, widely spreading, oblong to obovate. Stamens 5-10, equaling or slightly 

 exceeding the petals; anthers oval or oblong, much shorter than the slender filaments, 

 opening by terminal pores. Ovary 5-celled, oblong or obovoid, slightly lobed; style 

 elongate and persistent; ovules numerous. Capsules oblong or subglobose, obscurely lobed, 

 septicidally 5-valved from the base. Seeds many, minute, elongate, winged. [Name from 

 Ledon, the ancient Greek name for the plant now known as Cistus Ledon.'\ 



A genus of 4 species, natives of the north temperate and subarctic regions; besides the following, the type 

 species. Ledum palustre L., occurs in North America from Alaska to Newfoundland and also in Europe and 

 Asia. 



Leaves densely rusty-tomentose beneath. 1. L. grocnlandicum. 

 Leaves resinous-glanduliferous and pale beneath, not tomentose. 



Fruit subglobose; leaves flat, scarcely if at all revolute. 2. L. glandulosum. 



Fruit oblong; leaves conspicuously revolute. 3. L. columbianum. 



1. Ledum groenlandicum Oeder. Labrador Tea. Fig. 3671. 



Ledum groenlandicum Oeder, Fl. Dan. 4": 5. pi. 567. 1771. 

 Ledum tatifolium Ait. Hort. Kew. 2: 65. 1789. 



Erect shrub, 1-1.5 m. high, with tomentose branchlets. Leaves elliptic to oblong, 2-6 cm. 

 long, the margins strongly revolute ; petioles very short, not over 3 mm. long ; pedicels slender, 

 20-25 mm. long, glandular and finely pubescent ; petals white, 5-8 mm. long, oblong, rounded at 

 the apex and narrowed at the base ; stamens 5-7 ; filaments glabrous or sometimes pubescent at 

 base ; capsule oblong, 5-7 mm. long, about twice as long as thick. 



Cold marshes and sphagnum bogs. Humid Transition and Canadian Zones; Alaska to western Washington 

 and Tillamook County, Oregon; eastward to New England, Labrador, and Greenland. Type locality: Greenland. 

 May-July. 



2, Ledum glandulosum Nutt. Glandular Labrador Tea. Fig. 3672. 



Ledum glandulosum Nutt. Trans. Amer. Phil. Soc. II. 8: 270. 1843. 

 Ledum californicum Kell. Proc. Calif. Acad. 2: 14. 1863. 



Stout erect shrub, 1-2 m. high, or lower at high elevations, bark tardily exfoliating, twigs 

 puberulent and glandular. Leaves pale, scarcely or not at all revolute, oblong to broadly elliptic- 

 oval, 1.5-5 cm. long, green and rugose above, whitish-puberulent and resinous-granuliferous 

 beneath; petioles 5-10 mm. long; pedicels puberulent and usually glandular; calyx-lobes cilio- 

 late and ciliate on the margins ; petals white, 5-8 mm. long, oblong ; stamens usually 10 ; fila- 

 ments hairy below the middle ; capsule subglobose, 4-5 mm. in diameter and but little longer. 



Wet mountain meadows. Boreal Zones; British Columbia south through the Pacific States in the mountains 

 to the Sierra Nevada, California, east to the Rooky Mountains from Alberta to Wyoming. Type locality: "Cen- 

 tral chain of the Rocky Mountains, on the sides of mountains which close up Thornberg's ravine." May-July. 



