Ordbb 73.— HEATHWORTS. 239 



§ Lobes of the calyx all (rarely 1 excepted) very short or minute 1, 2 



§ Lohes of the calyx all oblong, and of conspicuous length 8-5 



1 A. visco'sa. Clammy Swamp Pink. Flowers very viscid, appearing with the 



full-grown leaves, the tube much longer than the segments. Shrub 4-7f. 

 White pr roseate. 



2 A. nudiflo'ra. Pinxter Bloom. Clusters naked, appearing with or before the 



young leaves. Corolla tube downy, scarcely longer than the segments. 

 Branches often whorled. Colors pink^ purple, white, buff, &o. t 



3 A. calendula'oea. Flaming Pmxter. Young branchlets downy, corymbs nearly 

 or , quite leafless. Tube of the corolla hairy, shorter than the ample lobes. 

 Common. Penn. S. & W. Mowers very many, flame-color, bright red, saffron- 

 yellow, &c. t 



i A. arbores'oens. Tree Azalea. Branches smooth. Leaves glaucous beneath. 

 Corymbs leafy with full-grown leaves. Corolla tube longer than the lobes, not 

 viscid. Height 10-20f. Mountains. S. 



5 A. Pon'tica. Asiatic A. Flowers viscid, with full-grown leaves. Tube wide- 

 mouthed, as long as segments. All colors. + 



7. KHODODEN'DRON'. Rose Bay. 



CaJyx 5-parted. Corolla broad, oampanulate, regular or slightly irreg- 

 ular, 5-lobed. Stamens 10, mostly declined, anthers opening by pores. 

 Capsule 5-celled, 5-valved. — Shrubs with alternate, entire, evergreen 

 leaves. Flowers umbeled, splendid. 



§ Calyx lobes large, leaf-like. Exotic 7 



§ Calyx lobes small, scale-like a 



a Leaves small, obtuse at each end. Mountains. . . .1, 2 



a Leaves large, acute, rusty or silvery beneath 5, 6 



a Leaves large, acute, glabrous beneath 3, 4 



1 H. Lappon'ioum. Lapland B. Shrub 5-10' high. Lvs. scaly, elliptic. N. 



2 H. Catawbien'se. Oatawba B. Shrub 8-5f. high. Leaves smooth, oval. S. 



3 E. max'imujn. Great B. Leaves oblanceolate, acute, paler beneath. Flowers 



in large umbe*, white, with yellow dots. Eooky woods. 



4 E, Pon'ticum. Asiatic B. Leaves lanceolate, acuminate, not paler beneath. 



Flowers large, purple, variegated. 



5 H. pimcta'tum. Dotted-lf. J?. Lvs. with rusty, resinous dots beneath. Mts. S. 



6 E. arbo'remn. Tree B. Leaves with silvery spots, beneath. Asia, f 



7 H. In'dioum. Indian B. Leaves rough, wedge-lance. Fls. few together, t 



8. PTE'OLA. False 'Wintergreen. 



Calyx 5-parted. Petals 5, equal. Stamens 10, anthers large, turned 

 outwards, opening by 2 pores at the obtuse top. Style thick, long ; stig- 



