Vor, II.J HEATH FAMILY, 557 
Sepals or calyx-lobes valvate, or separate, in the bud. 
Anthers 2-awned on the back. 
Corolla urn-shaped or cylindric; leaves not glaucous. 13. Pieris, 
Corolla globose; leaves narrow, glaucous beneath. 14. Andromeda, 
Anthers awnless, 15. Xolisma, 
Anther-sacs longitudinally dehiscent. 
Corolla ovoid-cylindric, 5-toothed; tall shrub or tree. 16. Oxydendron. 
Corolla salverform, 5-lobed; trailing shrub. 17. Epigaea.; 
} t Fruit a drupe, or a capsule enclosed by the fleshy accrescent calyx. 
Fruit consisting of the fleshy calyx surrounding the capsule. 18. Gaultheria. 
Fruit a drupe with 4 or 5 nutlets. 
Nutlets coalescent; leaves persistent. 19. Arctostaphylos. 
Nutlets separate; leaves deciduous. 20, Matrania. 
% % % Fruit a septicidal capsule; corolla withering-persistent; anthers appendaged. 
e 21. Calluna, 
1. LEDUM IL, Sp. Pl: 391. 753; 
Erect branching evergreen resinous shrubs, with scaly buds, the foliage fragrant when 
crushed. Leaves alternate, thick, short-petioled, oblong or linear, revolute-margined. 
Flowers white, numerous in terminal umbels or corymbs. Pedicels bracted at the base, the 
bracts scarious, deciduous. Calyx small or minute, 5-toothed, persistent, Petals 5, obovate 
or oval, obtuse, spreading, imbricated, Stamens 5 or Io (rarely 5 to 7), exserted; filaments 
filiform; anthers small, attached by their backs to the filaments, globose-didymous, awnless, 
the sacs opening by terminal pores. Disk annular, 8-1o-lobed. Ovary ovoid, scaly, 5- 
celled; ovules numerous; style filiform; stigma 5-lobed. Capsule oblong, 5-celled, septici- 
dally 5-valved from the base. [Greek, ledon, the plant now called Cistus Ledon.] 
Three species, natives of the north temperate and sub-arctic zones. Besides the following, an- 
other occurs on the Pacific coast. 
Leaves linear, 1’’-2'’ wide; stamens ro. 1. L. palustre. 
” - 7 yy 
Leaves oblon -8'' wide; stamens 5-7. 2. L. Groenlandicum, 
g, yet 
1. Ledum palustre L. Narrow-leaved 
Labrador Tea. (Fig. 2741.) 
Ledum palustre \,. Sp. Pl. 391. 1753. 
Ashrub, 6/-2° high, the twigs rusty-tomentose. 
Leaves linear, obtuse, dark green and somewhat 
rugose above, densely tomentose with brown wool 
beneath, strongly revolute-margined, '4/-114’ long, 
1//-2/’ wide; flowers 3/’-5’’ broad; pedicels very pu- 
bescent, 6’/-12’’ long in fruit; stamens 10; capsule 
oblong or oval, scurfy, about 2’ high and 1/7 in 
diameter, nodding; calyx-teeth less than 14’ long, 
ovate, obtusish. 
In bogs, Newfoundland to Alaska. Also in northern 
Europe and Asia. Called also Marsh Tea, Wild Rose- 
mary. Yields the Ledum oil. Summer. 
2. Ledum Groenlandicum OEder. 
Labrador Tea. (Fig. 2742.) 
ep Groenlandicum OF der, Fl. Dan. pi. 
Ledum lalifolium Ait. Hort. Kew. 2: 65. 1789. 
A shrub, 1°-4° high, similar to the pre- 
ceding species, the twigs densely tomentose. 
Leaves oblong, obtuse, 1/-2’ long, 3//-8// 
wide, green and slightly rugose above, 
densely brown-tomentose beneath, strongly 
reyolute-margined; flowers 4//-5/’ broad, 
umbellate or short-corymbose; pedicels 
brown-canescent or tomentose, 10//—12// 
long and recurved in fruit; stamens 5-7; 
capsule oblong, canescent, nodding, 3//— 
3%” long, 1//-114’’ in diameter. 
In bogs and swamps, Greenland to British 
Columbia, south to Massachusetts, New Jersey, 
Pennsylvania and Wisconsin. May-June, 
