ORDER 73.—HEATHWORTS. 239 
§ Lobes of the calyx all (rarely 1 excepted) very short or minute....1, 9 
§ Lobes of' the calyx all oblong, and of conspicuous length....8-5 
1 A. visco’sa. Claimmy Swamp Pink, Flowers very viscid, appearing with the 
full-grown leaves, the tube much longer than the segments. Shrub 4-7f. 
White or roseate. 
2.4, 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, &e. + 
8 A. calendula’cea. Flaming Pinzter. Young branchlets downy, corymbs nearly 
or quite leafless. Tube of the corolla hairy, shorter than the ample lobes. 
Common. Penn. 8.& W. Flowers very many, flame-color, bright red, saffron- 
yellow, &e. + 
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. 8. 
5 A. Pon’tica. Asiatic A. Flowers viscid, with full-grown leaves. Tube wide- 
mouthed, as long assegments. All colors. + 
7. RHODODEN'DRON. Rose Bay. 
Calyx 5-parted. Corolla broad, campanulate, 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....4 
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 &. Shrub 5-10’ high. Lwvs. sealy, elliptie. N. 
2 R. Catawbien’se. Catawba R. Shrub 8-5f. high. Leaves smooth, oval. 8S. 
8 R.max’imum. Great 2. Leaves oblanceolate, acute, paler beneath. Flowers 
in large umbels, white, with yellow dots. Rocky woods. 
4 R.Pon’ticum. Asiatic &. Leaves lanceolate, acuminate, not paler beneath. 
Flowers large, purple, variegated. 
5 R. puncta’tum. Dotted-lf. 2. Lvs. with rusty, resinous dots beneath. Mts. S&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. + 
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- 
