598 ARBORETUM ET FRUTICETUM BRITANNICUM. 
Stamens exserted. (Don’s Mill.) A deciduous shrub. North America. 
Height 2 ft. to 6ft. Introduced in 1812. Flowers scarlet; June and July 
& 28. R. ARBORE’SCENS Torr. (A. arpore’scens Pursh.) The arborescent Azalea. 
Identification. Torr., 1. c.; Don’s Mill., 3, p. 847. 
Synonymes. Azalea arboréscens Pursh Fl, Amer. Sept. 1. p. 153.3 A. arbdrea Bart. Cat. 
Engravings. Our fig. 1138. from a specimen in the herbarium of Professor DeCandolle. 
Spec. Char., §c. Leaves obovate, rather obtuse, 
smooth on both surfaces, glaucous beneath, cili- 
ated on the margins, having the midrib almost 
smooth. Flowers not clammy, leafy. Tube of 
corolla longer than the segments. Calyx leafy, 
with the segments oblong and acute. Filaments 
exserted. (Don’s Mill.) A deciduous shrub or 
low tree. Pennsylvania. Height 10 ft. to 15 ft. 
Introduced in 1818. Flowers rose-coloured; June 
and July. 
Pursh says it forms, with its elegant foliage, and 
large, abundant, rose-coloured flowers, the finest 
ornamental shrub he knows. The flowers are not so 1138. A. arboréscens. 
pubescent as those of the other species. The scales 
of the flower buds are large, yellowish brown, and surrounded with a fringed 
white border. 
§ vii. Rhodora D. Don. 
Identification. Don’s Mill., 3. p. 848. 
Derivation. From rhodon, a rose ; in reference to the colour of the flowers. 
Sect. Char, Limb of calyx 5-toothed. Corolla bilabiate ; 
upper lip broadest, and 2—3-cleft; lower one biden- 
tate. Stamens 10. Capsule 5-celled, 5-valved. Leaves 
deciduous. (Don’s Mill.) 
a 29. R. Ruopo’ra G. Don. (Raovo'ra canape’nsis L.) 
The Canada Rhodora. 
Identification. Don’s Mill., 3. p. 843. 
Synonyme. Rhoddra canadénsis Lin. Sp. 561. 
Engravings. Bot. Mag., t. 474. ; and our fig. 1139. 
Spec. Char., §c. eaves oval, quite entire, pubescent and 
glaucous beneath. Flowers in terminal clusters or 
racemose umbels, pale purple, and protruded before 
the leaves. (Don’s Mill.) An erect deciduous shrub. 
Canada, Newfoundland, and on the mountains of New 
York and Pennsylvania, in bogs. Height 2ft. In- 
troduced in 1767. Flowers pale purple; April and 
May. Capsules brown; ripe in August. 
1130. x. Rhoddra. 
Genus XXII. 
KA’LMIA L. Tue Kauata. Lin. Syst. Decandria Monogynia. 
Identification. Lin. Gen,, No. 545.; Don’s Mill., 3. p. 850. 
Synonyme. American Laurel. 
erivation. Named by Linnzus in honour of Peter Kalm, professor at Abo, in Sweden; author of 
Travels in America tr 1753. 7 
Gen. Char. Calyx 5-parted. Corolla salver-shaped ; under side of limb pro- 
ducing 10 cornute protuberances, and as many cavities on the upper side, in 
