280 ERICACEAE. 



380. CASSIOPE. 



Low tufted evergreen branched heath-like shrubs ; leaves small, 

 veinless, imbricated, often opposite orwhorled; flowers solitary, 

 nodding at the tip of an erect naked pedicel; sepals 4 or 5, ovate; 

 corolla white or rose-colored; stamens 8-10, included; style thick- 

 ened at the base; ovary 4- or 5-celled, many-ovuled; capsule 

 globose or ovoid, 4- or 5-valved. 



Leaves not dorsally furrowed. C. mertensiana. 



Leaves with a deep dorsal furrow. C. tetragona. 



Cassiope mertensiana (Bong.) G. Don. Stems much branched, 20-40 cm. 

 high, the branches erect; leaves oblong, thick, glabrous, 3-4 mm. long, closely 

 appressed, 4-ranked, not furrowed on the back; pedicels slender; corolla 6 mm. 

 long. 



Very common in the mountains at about the limit of trees, often occupying 

 large areas. 



Cassiope tetragona (L.) D. Don. Very similar to C. mertensiana but 

 stouter; leaves puberulent when young, deeply furrowed on the back. 



Cascade Mountains, 49th parallel, Lyall, northward to Alaska. Lyall's 

 specimens were probably from east of the Cascade divide as the plant was 

 found near Loomis, Washington, by Elmer. 



381. HARRIMANELLA. 



Low matted shrubs; leaves small, numerous, alternate, per- 

 sistent, sessile or nearly so, linear to oblong; flowers solitary at 

 the ends of the branches; calyx deeply 5-lobed; corolla campan- 

 ulate, white or pink; stamens 10, included; anther-sacs awn- 

 pointed; ovary 5-celled; fruit a subglobose, 5-lobed, 5-valved, 

 many-seeded capsule. 



Harrimanella stelleriana (Pall.) Coville. Stems very slender, spreading 

 and matted; leaves linear-oblong, obtuse oracutish, serrulate, 2—4 mm. long; 

 pedicels equalling or exceeding the leaves; calyx-lobes oblong-oval, obtuse; 

 corolla white, 6-7 mm. long; capsules subglobose. 



Mount Rainier, on moist slopes at about the limit of trees and northward 

 to Alaska. 



382. LEDUM. Labrador Tea. 



Erect branching shrubs; leaves alternate, evergreen, entire, 

 more or less resinous-dotted, slightly fragrant when bruised; 

 flowers white, in terminal bracted corymbs; calyx small, 5-tooth- 

 ed, persistent; petals 5, obovate or oval, obtuse; stamens 5 or 10, 

 exserted; style filiform, exserted; stigma 5-lobed; ovary ovoid, 

 5-celled; capsule oblong, 5-celled, 5-valved. 



Leaves glaucous beneath. L. columbianum. 



Leaves rusty-tomentose beneath. L. groenlandicum. 



Ledum columbianum Piper. Erect with erect branches, 60-90 cm. high; 

 bark becoming smooth and brown; leaves oblong, reticulate, 4-6 cm. long, 

 rather obtuse but apiculate, strongly revolute, dark green and glabrous above, 



