ERICACEAE. 217 



3. A. arborescens Pursh. Shrub, or tree becoming 6 m. tall, the twigs gla- 

 brous: leaf -blades elliptic, oval, oblanceolate, or cuneate, 4-10 cm. long, gla- 

 brous beneath: calyx-lobes 4-6 mm. long: corolla white or pale-pink; tube 

 2.5-3 cm. long: anthers about 3 mm. long: capsules 1-2 em. long, stout, 

 bristly-glandular, abruptly narrowed at the apex. Islands and shores of the 

 Susquehanna. Schists. Late spr. and early sum. SMOOTH-AZALEA. 



2. RHODODENDRON L. Evergreen shrubs or trees. Leaves alternate: 

 blades leathery, not ciliate. Calyx persistent: lobes broad and short. Corolla 

 variously colored, campanulate: tube very short; limb 2-lipped. Stamens 

 usually 10, slightly exserted, with terminal pores. Style declined. Capsule 

 elongate. - 1 *! 



1. R. maximum L. Shrub, or tree becoming 12 m. tall, the twigs glabrous or 

 nearly so: leaf -blades oblong to oblong-oblanceolate, 10-25 cm. long, bright- 

 green: calyx-lobes 4-6 mm. long: corolla white or pink, mottled with yellow 

 or orange, 3-6 cm. wide. Eavines, near the Susquehanna and rarely near 

 other large streams. Sum. GREAT-LAUREL. 



3. KALMIA L. Evergreen shrubs or trees. Leaves alternate, opposite, 

 or whorled: blades entire. Calyx persistent: lobes 5, leathery. Corolla regu- 

 lar, white, pink, purple, or crimson, rotate, the lobes obtuse : tube short, with 

 10 sacs. Stamens 10: filaments elastically straightening at maturity: anthers 

 short, attached near the top. Capsule spheroidal. Sum. LAUREL. 



Corolla about twice as long as the calyx : inflorescence lateral : sepals not ciliate. 



1. K. angustifolia. 



Corolla several times as long as the calyx : inflorescence termi- 

 nal : sepals ciliate. 2. K. latifolia. 



1. K. angustifolia L. Shrub 2-12 dm. tall, the twigs glabrous or nearly so: 

 leaf -blades oblong to lanceolate, 2-6 cm. long, pale beneath: calyx-lobes ovate 

 to oblong-ovate, 1-1.5 mm. long: corolla purple to crimson, 6-8 mm. wide: 

 filaments 3-4 mm. long : capsules 3-3.5 mm. wide. S. Eare, on moist banks 

 near New Texas. Schists. SHEEP-LAUREL. LAMBKILL. WICKY. 



2. K. latifolia L. Shrub, or tree becoming 12 m. tall, the twigs often fuzzy 

 when young: leaf -blades elliptic to oval, 5-12 cm. long, glabrous, dark-green: 

 calyx-lobes oblong to oblong-ovate, about 2 mm. long: corolla white or pink, 

 20-25 mm. wide: filaments 10-12 mm. long: capsules 5-7 mm. wide. Com- 

 mon, in dry woods. MOUNTAIN-LAUREL. CALICO-BUSH. SPOON-WOOD. 



4. EPIG-AEA L. Evergreen creeping undershrubs. Leaves alternate: 

 blades entire. Flowers perfect or dioecious, in axillary clusters. Calyx-lobes 

 5, persistent, but scarcely accrescent. Corolla white or pink, salverform, the 

 limb 5-lobed. Filaments slender, with a tuft of hairs near the middle: anthers 

 oblong-ovoid, awnless. Stigma 5-lobed. Capsule depressed. 



1. E. repens L. Stem and branches 5-30 cm. long, hirsute: leaf -blades oblong 

 to oblong-ovate or suborbicular, 2-10 cm. long, finely reticulate: calyx-lobes 

 lanceolate, acuminate: corolla about twice as long as the calyx; lobes ovate: 

 capsules spheroidal, 5-lobed. N. S. Common, in dry woods and on banks. 

 Sandstones and shales, schists. Spr. TRAILING-ARBUTUS. MAYFLOWER. 



5. EiUBOTRYS Nutt. Deciduous-leaved shrubs with rigid stems and 

 branches. Leaves alternate: blades finely toothed. Flowers in terminal 

 racemes. Calyx-lobes very short. Stamens 10, included: anthers awned. 

 Capsule depressed. 



