882 ERICACEAE 
3. DENDRIUM Desv. 
Low evergreen shrubs, with much branched stems. Leaves alternate or opposite : blades 
leathery, entire. Flowers perfect, in terminal corymbs, pedicelled. Calyx persistent : 
sepals 5, rigid. Corolla white or pink : petals 5, sessile, imbricated. Stamens 10, exserted. 
Filaments filiform, glabrous. Anthers awnless, opening lengthwise. Disk 10-lobed. 
Ovary 2-5-celled. United styles straight. Stigma truncate. Ovules numerous. Capsule 
ovoid, septicidally 2-5-valved. [Leiophyllum Pers.] SAND MYRTLE. 
Leaves mainly opposite; blades oval or broadly oblong: lobes of the capsules toothed on back. 
1. D. prostratum. 
Leaves mainly alternate; blades oblong: capsules smooth or nearly so. 
Leaf-blades 4-8 mm. long: filaments nearly twice as long as the petals: capsules 
about thrice as long as the sepals. 2. D. buxifolium. 
Leaf-blades 1-1.5 em. long: filaments about as long as the petals: capsules about i 
twice as long as the sepals. 3. D. Hugeri. 
1. Dendrium prostràtum (Loud. ) Small. An evergreen shrub 1-2 dm. tall, with 
diffuse and depressed branches. Leaves mainly opposite ; blades leathery, oval or broadly 
oblong, 4-7 mm. long, obtuse, revolute, lustrous above, pale and dull beneath, narrowed 
into petioles 1-2 mm. long ; flower-clusters loose or dense : bracts mostly oblong-ovate, ob- 
tuse : pedicels 5-8 mm. long, minutely glandular : sepals variable, lanceolate to linear, 
obtusish : corolla white ; petals oval-oblong or sometimes somewhat ovate, 3.5 mm. long, 
obtuse : filaments club-shaped, longer than the petals : capsules broadly ovate or orbicular- 
ovate, 2.5-3 mm. long, somewhat lobed, the lobes toothed on the back, more than twice as 
long as the sepals, commonly elevated on a disk-like stipe. 
On rocky mountain summits, North Carolina and Tennessee. Spring. 
2. Dendrium buxifdlium (Berg.) Desv. An evergreen shrub 0.5-5 dm. tall, with 
erect or spreading much-branched stems. Leaves mainly alternate; blades leathery, ob- 
long, obtusish or acutish, lustrous above, paler and dull beneath, narrowed into petioles 
about 1 mm. long: flower clusters dense: bracts oblong or nearly so, 1-1.5 mm. long: 
pedicels 2-6 mm. long, glabrous or very sparingly glandular: sepals oblong-lanceolate, 1 
mm. long, obtusish : corolla white; petals oblong-ovate, 2-2.5 mm. long, obtuse: filaments 
club-shaped, nearly twice as long as the petals: capsules ovoid, 3 mm. long, glabrous or 
nearly so, prominently lobed, about thrice as long as the sepals. 
In sandy pine lands, New Jersey to Florida. Spring. 
3. Dendrium Hügeri Small. An evergreen shrub 2-4 dm. tall, with erect much- 
branched stems. Leaves mainly alternate; blades leathery, oblong, 1-1.5 em. long, 
lustrous and dark green, paler beneath, obtuse, revolute, somewhat obliquely narrowed 
into petioles 1-2 mm. long: flower-clusters dense : bracts oblong-ovate, 3 mm. long, 
obtuse: pedicels 5-10 mm. long, minutely glandular: sepals lanceolate, almost 1 mm. 
long, acute: corolla white; petals ovate, 4 mm. long, obtuse: filaments club-shaped, as 
long, as the petals: capsules ovoid, 3.5-4 mm. long, glabrous or nearly so, obtusely lobed, 
twice as long as the sepals, abruptly contracted into the stoutish style which is about as long 
as the capsule-body. 
On cliffs and rocky mountain summits, North Carolina. 
4. AZALEA L. 
Shrubs, with erect irregularly branching stems. Leaves alternate, deciduous: blades 
entire or bristle-toothed. Flowers perfect, in terminal clusters. Sepals 5. — Corolla 
funnelform, of various colors: tube narrow, elongated: lobes 5, unequal, spreading, E 
posed in 2 lips. Stamens 5, or rarely 10, conspicuously exserted. Filaments often col- 
ored, declined. Anthers awnless, opening by terminal pores. Ovary 5-celled. : Styles 
declined, long-exserted. Ovules numerous in each cavity. Capsule elongated, septicidally 
5-valved.. 
Corollas expanding before the leaves. 
Corolla red. orange or yellow. 1 Annien 
Corolla pink or white. 9. A. canescens. 
Leaf-blades canescent beneath: corolla-tube glandular-pubescent. 2 3 4. nudiflora. 
Leaf-blades strigose especially on the midnerve beneath: corolla-tube hirsute. 3. 4. 
Corollas expanding after the leaves. A. candida. 
Leaf-blades densely white-tomentose beneath. 4. 4. 
Leaf-blades glabrous or with scattered hairs beneath. 
A. Midnerve strigose beneath at maturity. 
a. Corolla-tube less than 3 em. long: eastern species. 5. 4 m 
