Part 1, 1914] ERICACEAE 41 
‘DistRrpurTion: Greenland, Arctic America, and Alaska to Newfoundland and the White 
Mountains, New Hampshire; also in Europe and Asia. 
IntustRations: L. Fl. Lapp. pl. 6; Pall. Fi. Ross. pl. 70; Fl. Dan. pl. 9; Gaertn. Fruct. 
pl. 63; Nouv. Duham. 5: 1. 65; Schkuhr, Handb. fl. 36; Lam, Tab. Encyc. pl. 110; Engl. Bot. 13: 
Partie Bot. Cab. #1. 762; Baxter, Brit. Bot. 6: pl. 463; Britt. & Brown, Ill. FI. f. 2755; ed. 2. 
7. AZALEA L. Sp. Pl. 150. 1753. 
Shrubs or small trees, with glabrous or variously. pubescent foliage and deciduous or 
caducous bud-scales. Leaves alternate, remote or sometimes approximate at the ends of the 
branches, deciduous; blades mostly broad, thin or thickish, entire or obscurely toothed, ciliate, 
gland-tipped, petioled. Flowers in clusters terminating the branches, sooner or later sur- 
rounded by the leaf-clusters or leafy branches. Calyx flat or saucer-shaped, small; lobes 5, 
very short or occasionally somewhat elongate, persistent. Corolla white, pale, or highly- 
colored, funnelform; tube elongate, gradually or abruptly dilated into the limb; lobes 5, usually 
longer than the limb-body, unequal, often undulate or crisped, spreading or recurved. Stamens 
5 or 10, much exserted; filaments very slender, declined; anthers oblong or oval. Ovary 5- 
celled, shallowly lobed, usually strigose, slightly elongate; style declined greatly elongate, 
slightly enlarged at the apex; stigma discoid-capitate. Capsule narrow, oblong to linear, or 
gradually narrowed to the apex, rather thick-walled. 
Type species, Azalea indica L. 
Flower-clusters appearing before the leaves, or as the leaves unfold. 
Corolla red, orange, or yellow. 
Bud-scales glabrous on the black; leaf-blades shining and glabrous 
above, except the midrib; capsule strigose-hirsute. 1. A. lutea. 
Bud-scales silky on the back; leaf-blades finely reticulate and minutely 
pubescent above; capsule glandular-pubescent. . 2. A. austrina. 
Corolla pink, white, or purplish. 
Corolla-tube hirsute or strigose. 3. A. nudifiora. 
Corolla-tube glandular-pubescent. 
Leaf-blades reticulate; capsule finely canescent and hirsute. 4. A. canescens. 
Leaf-blades thin, not reticulate; capsule glandular-pubescent. 5. A. prinophylia. 
Flower-clusters appearing after the leaves. : 
Plants of the Atlantic States; calyx-lobes coarsely ciliate. 
Style pubescent, at least near the base. 
Leaf-blades permanently white or pale-tomentose beneath; capsule 
pale-canescent. 6. A. candida. 
Leaf-blades with scattered appressed hairs, sometimes only on the 
midrib; capsule, as far as known, hirsute. ‘ 
Leaf-blades predominatingly of an obovate, cuneate, or oblong- 
oblanceolate type. 
Calyx-lobes short, ovate or rarely oblong-ovate; young leaf- 
blades not strigillose. 7, A. viscosa. 
Calyx-lobes long, lanceolate; young leaf-blades strigillose. 8. A. oblongifolia. 
Leaf-blades predominatingly of an oblong or oval type. 9. A. serrulaia, 
Style glabrous. 
Calyx-lobes oblong to lanceolate, ciliate with gland-tipped hairs; 
corolla more than 3 cm. long, white or pink. 10. A. arborescens,. 
Calyx-lobes ovate to half-orbicular, ciliate with glandless hairs; 
corolla less than 3 cm. long, crimson. 11. A. prunifolia. 
Plant of the Pacific slope; calyx-lobes finely ciliate. 12. A. californica. 
1. Azalea lutea L. Sp. Pl. 150. 1753. 
Azalea calendulacea Michx. Fl. Bor. Am. 1:151. 1803. @~ 
Rhododendron calendulaceum Torr. Fl. U. S. 425. 1824. 
Rhododendron luteum C. K. Schneider, Handb, Laubh. 2: 500. 1911. Not R. luiewm Sweet, 1830. 
A shrub 5 m. tall or less, with erect or spreading branches and finely loose-pubescent twigs; 
leaf-blades oval, elliptic, or obovate, 3-8 cm. long or more, abruptly gland-tipped, ciliate, with 
scattered hairs beneath, at least when young, and pubescent on the midrib (or sometimes 
canescent beneath, probably hybrids with A. prinophylia), short-petioled; flower-clusters ex- 
panding with the leaves; pedicels pubescent, sometimes glandular; calyx-lobes ovate to oblong, 
long-ciliate, obtuse; corolla yellow to red, or variegated, 2.5-3.5 cm. long, the tube gradually 
dilated upward, glandular-pubescent, the lobes broad, abruptly short-pointed; anthers 2.5-3. 
mm. long; capsules oblong or ovoid-oblong, 1.5—-2 cm. long or rarely more, pubescent. 
Typ# LocaLity: On the Savannah River. . 
DristrR1BurIon: Southern New York and Pennsylvania, in and near the mountains to northern 
Georgia. 
TeLoseavions: Bot. Mag. pl. 1721, 2143; Britt. & Brown, Ill. Fl. f. 2745; ed. 2. f. 3217. 
