Part 1, 1914] ERICACEAE 37 
Flowers perfect, in corymb-like or umbel-like clusters from scaly buds. Calyx saucer-shaped; 
lobes 5, broad, short, often as wide as long. Corolla white; petals 5, spreading, broad, ovate; 
oval, or obovate, or sometimes oblong, equal or nearly so. Stamens 5-10, erect or ascending; 
filaments filiform or slender-subulate; anthers oblong to oval, much shorter than the filaments, 
Ovary 5-celled, slightly elongate, obscurely lobed; style elongate, nearly straight, slightly 
enlarged at the apex; stigma obscurely annulate. Capsule longer than thick or subglobose, 
shallowly lobed, 5-valved from the base to the apex, septicidal. 
Type species, Ledum palustre L, . 
Leaf-blades tomentose beneath, strongly revolute. 
Stamens 5-7; capsules mostly oblong. 
Stamens 10; capsules oval to ovoid or obovoid. 
Style several times longer than the ovary; leaf-blades broad. . L. pacificum. 
1. L. groenlandicum. 
2 
Style about as long as the ovary; leaf-blades narrow. 3. L. decumbens. 
4 
5 
Leaf-blades resinous-granuliferous beneath, flat or slightly revolute. 
Capsules subglobose; calyx-lobes ciliolate and ciliate. 
. L, glandulosum, 
Capsules oblong; calyx-lobes merely ciliolate. 
. L. columbianum, 
1. Ledum groenlandicum Oeder, Fl. Dan. 4°: 5. 1777. 
Ledum latifolium Ait. Hort. Kew. 2:65. 1789. 
Ledum palustre latifolium Michx. Fl. Bor. Am. 1: 259. 1803. 
Ledum canadense Lodd. Bot. Cab. pl. 1049. 1825. 
An erect shrub with loosely pubescent twigs; leaf-blades oblong, elliptic, or oval, or some- 
times apparently narrower on account of the strongly revolute margins, 2-6 cm. long, obtuse, 
glabrous or nearly so above, felty-tomentose beneath, short-petioled; pedicels minutely pu- 
bescent; calyx-lobes broadly deltoid, acute or acutish; petals oblong or ovate-oblong, 5-8 mm. 
long; stamens 5-7; filaments mostly glabrous; capsules oblong, 5-6.5 mm. long, usually about 
twice as long as thick. 
Tyre Locality: Greenland. 
Disrrreution: Greenland, Labrador, and Newfoundland to Alaska, Pennsylvania, Wisconsin, 
Alberta, and Washington. 
ILLUSTRATIONS: Fl. Dan. #1. 567; Meerberg, Pi. Sel. 1. 20; Lam. Tab. Encye. pl. 363, f. 1; 
Jacq. Ic. Rar. pl. 464; Nouv. Duham. 4: gl. 27; Bot. Cab. pl. 534, 1049; Henshaw, Mountain FI. 
Am. gl. 96; Brown & Schaffer, Alp. Pl. Can. pl. 60; Britt. & Brown, Ill. Fl. f. 2742; ed. 2. f. 3214. 
2. Ledum pacificum Small, sp. nov. 
Ledum palusire dilatatum A. Gray, Syn. Fi. 21:43. 1878. Not L. palustre dilatatum Wabl. 1812. 
An erect shrub with loosely pubescent twigs; leaf-blades oblong, elliptic, or oblong- 
lanceolate, 1.5-4 cm. long, more or less revolute, obtuse or acutish, ultimately glabrous above, 
copiously tomentose beneath, short-petioled; pedicels puberulent; calyx-lobes deltoid, obtuse; 
petals oblong to oval, 5-6.5 cm. long; stamens 10; filaments pubescent below the middle; 
capsules oval or subglobose, 4.5-5.5 mm. long, slightly longer than thick. 
Type collected on Sitka, Tiling (herb. N. Y. Bot. Gard.). 
DISTRIBUTION: Sitka; also in Japan. 
3. Ledum decumbens (Ait.) Lodd.; Steud. Nom. Bot. 
ed. 2.2: 20. 1841. 
Ledum palustre decumbens Ait. Hort. Kew. 2:65. 1789. 
Ledum palustre angustifolium Hook. F1. Bor. Am. 2: 44, 1834. 
A diffuse, usually depressed shrub with tomentulose twigs; leaf-blades narrowly oblong to 
linear, strongly revolute and often narrowly linear on account of the revolute margins, 1-1.5 
em. long or less, obtuse, glabrous, at least ultimately, above, tomentulose beneath, very short- 
petioled; pedicels tomentulose; calyx-lobes broadly ovate to half orbicular, obtuse; petals oval 
or ovate-oval, 6-7 mm. long; stamens 10; filaments pubescent below the middle; capsules oval 
or obovoid, 3-4 mm. long, somewhat longer than thick. 
TYPE Locality: Hudson Bay. . 23 
Disrrrution: Greenland and Arctic America to Labrador, Alaska, and eastern Siberia. 
ILLUSTRATION: Britt. & Brown, Ill. Fl. ed. 2. f. 3213. 
