FLORA OF THE DISTRICT OF COLUMBIA. 223 



3. KALMIA L. 



Leaves commonly 2-3.5 cm. wide, usually acute, alternate but clustered near the 

 ends of the young twigs; corolla 1.5-2.5 cm. broad, white or pink; ripe pods 5-7 

 mm. thick, on erect pedicels 1. K. latifolia. 



Leaves less than 1.8 cm. wide, usually obtuse, in whorls of 3; corolla 7-12 mm. broad, 

 magenta-pink; pods 2-4 mm. thick, on recurved pedicels 2. K. angustifolia. 



1. Kalmia latifolia L. Mountain laurel. 

 Woods; common. May-June. Eastern N. Amer. 



A laurel thicket is shown in plate 38; the flowers are shown in plate 39. 



2. Kalmia angustifolia L. Sheep laurel. 

 Swamps, northeastward; infrequent. May- June. Eastern N. Amer. 



4. RHODODENDRON L. 



1. Rhododendron maximum L. Rhododendron. 



Ravines along the upper Potomac; very rare. June-July. Eastern N. Amer. 



5. AZALEA L. 



Flowers pink, or rarely white, opening in late April or early May, before or with the 

 leaves; coarse hairs on the outside of the corolla tube usually without glands; 

 leaves not glaucous beneath; scales of the winter flowering buds usually glabrous 

 outside, the margins ciliate 1. A. nudifiora. 



Flowers usually white, sometimes pink, opening in June or late May, after the growth 

 of the leaves; coarse hairs on the outside of the corolla tube always gland-tipped; 

 leaves often glaucous beneath; scales of the winter flowering buds usually with 

 satiny white hairs outside, besides the hairs of the margins 2. A. viscosa* 



1. Azalea nudifiora L. Pink azalea. 

 Dry woods and fields; common. Apr.-May. Eastern U. S. {Rhododendron 



nudiflorum Torr.) 



2. Azalea viscosa L. Swamp azalea. 

 Swamps, northeastward; frequent. May-June. Eastern U. S. (Rhododendron vis- 



■ cosum Torr.) 



A very variable species, several forms of which have been named. In A. viscosa 

 glauca (Michx.) A. Gray the leaves are glaucous beneath; in A. viscosa nitida (PuTBh) 

 A. Gray they are green on both sides. Both these forms occur in our region. 



6. XOLISMA Raf. 



1. Xolisma ligustrina (L.) Britton. 



Swamp or woods; common. June. Eastern U. S. (Andromeda ligustrina Muhl.; 

 Lyonia ligustrina DC.) 



7. NEOPIERIS Britton. 



1. Neopieris marlana (L.) Britton. Stagger-bush. 



Swamps or dry or moist woods, Rock Creek and eastward; common. May-June. 

 Eastern U, S. (Andromeda marlana L.; Lyonia mariana D. Don.) 



8. ETJBOTRYS Nutt. 



1. Eubotrys racemosa (L.) Nutt. Sweetbells. 



Swamps and dry or moist woods; frequent. May-June. Eastern U. S. (Leucothoe 

 racemosa A. Gray.) 



The winter buds are crimson and conspicuous. 



