Vot. II.] 



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. 



f f 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. Arctoslaphylos. 



Nutlets separate ; leaves deciduous. 20. Mairania. 

 -// -/r Fruit a septicidal capsule; corolla withering-persistent; anthers appendaged. 



v 21. Calluna. 



i. LEDUM L. Sp. PI. 391. 1753. 



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 10 (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, S-io-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, i"-2" wide; stamens 10. I. L. paluslre. 



Leaves oblong, 3"-8" wide; stamens 5-7. 2. L. Groenlandicum. 



i. Ledum palustre L. Narrow-leaved 

 Labrador Tea. (Fig. 2741.) 



Ledum palustre L. Sp. PI. 391. 1753. 



A shrub, 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, > / -i^ / long, 

 i // -2 // wide; flowers 3 // ~5 // broad; pedicels very pu- 

 bescent, 6 // -i2 // long in fruit; stamens 10; capsule 

 oblong or oval, scurfy, about 2" high and i" in 

 diameter, nodding; calyx-teeth less than j" 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.) 



Ledum Groenlandicum OEder, Fl. Dan. pi. 



567. 1771. 

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



A shrub, i-4 high, similar to the pre- 

 ceding species, the twigs densely tomentose. 

 Leaves oblong, obtuse, i / -2 / long, 3 // -8 // 

 wide, green and slightly rugose above, 

 densely brown-torn entose beneath, strongly 

 revolute-margined; flowers 4 // -5 // broad, 

 umbellate or short-corymbose; pedicels 

 brown -can esc ent or tomentose, io // -i2 // 

 long and recurved in fruit; stamens 5-7; 

 capsule oblong, canescent, nodding, 3"- 

 2>W long, i"-iX" in diameter. 



In bogs and swamps, Greenland to British 

 Columbia, south to Massachusetts, New Jersey, 

 Pennsylvania and Wisconsin. May-June. 



