Order T3.— HEATHWORTS. 239 



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



§ Lobes of the calyx all oblong, and of conspicuous lcn<(th S-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 or roseate. 



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



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



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

 8 A. calendula''cea. Flaming Finxter. Young branchlets downy, corymbs nearly 

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

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

 yellow, iSzc. t 



4 A. arbores'cens. 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. 

 6 A. Pon'tica. Asiatic A. Flowers viscid, witli full-grown leaves. Tube wide- 

 mouthed, as long as segments. All colors, t 



7. RnODODEN'ORON". Rose Bay. 



Calyx 5-parted. Corolla broad, campanulate, regular or slightly irreg- 

 ular, 5-lobed. Stamens ]0, 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 R. Lappon'icum. Lapland R. Shrub 5-10' high. Lvs, scaly, elliptic. N. 



2 R. Catawbien'se. Catawba R. Shrub 3-5f. high. Leaves smooth, oval. S. 



3 R. max'imum. Great R. Leaves oblanceolate, acute, paler beneath. Flowers 



in large unibels, white, with yellow dots. Eocky woods. 



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



Flowers large, purple, variegated. 



5 R. puncta'tum. Dotled-lf. R. Lvs, with rusty, resinous dots beneath. Mts. S. 



6 R. arbo'reum. Tree R. Leaves with silvery spots beneath. Asia, t 



7 R. In^dicum, Indian R. Leaves rough, wedge-lance. Fls, few together, f 



8. PYR'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- 



