676 ERICACEAE. Vol, II. 



or none. Ovary 2-5-celled ; style elongated or short ; stigma peltate or capitate ; 

 ovules usually numerous, anatropous. Fruit a capsule, berry or drupe. Seeds 

 usually numerous and minute, or sometimes only i in each cavity; endosperm 

 fleshy ; embryo central ; cotyledons short ; radicle terete. 



About 60 genera and iioo species, o£ very wide geographic distribution. 



* Fruit a septicidal capsule; corolla deciduous; anthers unappendaged. (Rhodo- 



DENDREAE.) 



Corolla of separate petals ; capsule dehiscent from the base. i. Ledum. 



Corolla gamopetalous (polypetalous in no. 6) ; capsule dehiscent from the apex. 

 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. Mensiesia. 



Corolla regular ; seeds angled, or rounded. 



Corolla polypetalous. 6. Dendrium. 



Corolla gamopetalous. 



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



Stamens 10 ; capsule s-celled. 



Corolla saucer-shaped, lo-saccate. 



Calyx-segments persistent ; corolla-lobes rounded. 8. Kalmia. 



Calyx-segments deciduous ; corolla-lobes acute. 9. Kalmiella. 



Corolla ovoid, 10. Phyllodoce. 



♦♦Fruit a loculicidal capsule (marginally septicidal in No. 21), berry or drupe; corolla 

 deciduous; anthers often awned. 



t Fruit a dry capsule {fleshy in no. 21) ; calyx not accrescent, mostly small. (Andro- 



MEDEAE.) 



t Corolla campanulate, cylindric, urceolate or subglobose ; anthers opening by terminal pores or 

 chinks. 

 Low heath-like shrubs with small subulate leaves ; corolla campanulate. 



Peduncles lateral ; corolla 5-lobed. 11. Cassiope. 



Peduncles terminal; corolla 5-cleft. 12. Harrinianella. 



Shrubs or trees, with linear to broadly oval leaves ; corolla urceolate to cylindric or subglobose. 

 Anther-sacs opening only at the top ; shrubs ; capsule oblong, ovoid, obovoid, or depressed- 

 globose. 

 Capsule dehiscent into 2 layers, the outer 5-valved, the inner lo-valved ; anthers awnless. 



13. Chamaedaphne. 

 Capsule simply 5-valved. 



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



Leaves evergreen ; bracts persistent ; anthers awnless. 14. Leucothoe. 



Leaves and bracts deciduous; anther-sacs i- or 2-awned; 15. Euhotrys, 



Sepals or calyx-lobes valvate. 



Anther-sacs awned ; sutures of the capsule not thickened. 



Seeds smooth and shining; awns of the anther-sacs ascending; narrow-leaved 



bog shrubs. 16. Andromeda. 



Seeds with a loose cellular coat ; awns of the anther-sacs deflexed ; broad- 

 leaved shrubs. 17. Pieris, 

 Anther-sacs awnless ; sutures of the capsule thickened. 



Filaments appendaged ; glabrous shrubs. 18. Neopieris. 



Filaments not appendaged ; pubescent or lepidote shrubs 19. Xolisma. 

 Anther-sacs opening by long chinks ; tree ; capsule ovoid-pyramidal : calyx-lobes valvate. 



20. O.vydendrum. 

 tt Corolla salverform ; anthers longitudinally dehiscent ; prostrate shrub. (Epigaeae). 



21. Epigaea. 



tt Fruit a drupe, or a capsule enclosed by the fleshy accrescent caly.v. 

 Fruit consisting of the fleshy calyx surrounding the capsule. (Gaultherieae.) 22. Gaultheria. 

 Fruit a drupe with 4 or 5 nutlets. (Arbuteae.) 



Nutlets coalescent ; leaves persistent. 23. Uva-Ursi. 



Nutlets separate ; leaves deciduous. 24. Mairania. 



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

 ceae.) 25. 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, S-toothed, persistent. Petals S, obovate 

 or oval, obtuse, spreading, imbricated. Stamens S or 10 (rarely S 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-io-lobed. Ovary ovoid, scaly, 5-celled; 

 ovules numerous; style filiform; stigina 5-lobed. Capsule oblong, S-celled, septicidally 

 5-valved from the base. Seeds elongated. [Greek, ledon, the plant now called Cistus Ledon.] 



