Ericaceae. 697 



prolonged upwardly into lubes. Ovary 2-5-celled ; stigma peltate or 

 capitate; ovules usually numerous, anatropous Fruit a capsule, berry or 

 drupe. Seeds usually numerous and minute, or sometimes only 1 in each 

 cavity ; endosperm fleshy ; embryo central ; cotyledons short ; radicle 

 terete. About 55 genera and 1050 species of wide distribution. 



* Fruit a septicidal capsule ; corolla deciduous ; anthers unappendaged. 

 Corolla of separate petals. i. Ledum. 



Corolla gamopetalous (polypetalous in No. 6). 



Corolla somewhat irregular (except in No. 5); seeds flat, winged. 

 Corolla funnelform to campanulate; stamens exserted. 



Corolla funnelform, slightly 2-lipped; leaves deciduous. 2. Azalea. 

 Corolla 2-lipped, lower lip divided to the base ; leaves deciduous. 



3. Rhodora. 

 Corolla campanulate; leaves evergreen. 4. Rhododendron, 



Corolla urn-shaped; stamens not exserted. 5. Menziesia. 



Corolla regular; seeds angled or rounded. 



Corolla polypetalous. 6. Dendrium. 



Corolla gamopetalous. 



Stamens 5; capsule 2-3-celled. 7. Chamaecistus. 



Stamens 10; capsule 5-celled. 



Corolla saucer-shaped, 10-saccate. 8. Kaltnia. 



Corolla ovoid. 9. Phyllodoce. 



* * Fruit a loculicidal capsule, berry or drupe ; corolla deciduous ; anthers often 



awned. 



t Fruit a dry capsule; calyx not accrescent, mostly small. 

 Low heath-like shrubs; leaves subulate, very small. 10. Casswpe. 



Shrubs, or trees ; leaves linear to broadly oval. 



Anther-sacs opening by a terminal pore or chink. 



Sepals or calyx-lobes imbricated, at least in the bud. 



Capsule dehiscent into a single layer of 5 valves. *x, Leucothoe. 



Capsule dehiscent into 2 layers, the outer 5-vaIved, the inner io-valved. 



15. Chamaedaphne. 

 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. 12. Andromeda. 

 Anthers awnless. 14. 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. Arctostaphxlos, 



Nutlets separate; leaves deciduous. 20. Mairania. 



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



21. Calluna. 



1. LEDUM L. 



Erect evergreen resinous shrubs, with scaly buds, the foliage fragrant when 

 crushed. Leaves alternate, thick, short-petioled, oblong or linear, revolute-mar- 

 gined. Flowers white, in terminal umbels or corymbs. Pedicels bracted at the 

 base, the bracts deciduous. Calyx 5-toothed, persistent. Petals 5, obtuse, spread- 

 ing, imbricated. Stamens 5 or 10 (rarely 5 to 7), exserted; filaments filiform; anthers 

 small, attached by their backs to the filaments, globose-didymous, the sacs opening 

 by terminal pores. Disk annular, 8-io-lobed. Ovary ovoid, scaly, 5 celled; 

 ovules numerous; style filiform; stigma 5-lobed. Capsule oblong, 5-celled, 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, 2-4 mm. wide ; stamens 10. 1. L. palustre. 



Leaves oblong, 6-16 mm. wide ; stamens 5-7. 2. L. Groenlandicum. 



I. Ledum palustre L. Narrow-leaved Labrador Tea. (I. F. f. 2741.) 

 A shrub, 1.5-0 dm. high, the twigs rusty-tomentose. Leaves dark green and 



