598 



ARBOKETUM ET FRUTICETUM BR1TANNICUM. 



Stamens exserted. (Don's MM.} A deciduous shrub. North America. 

 Height 2 ft. to 6ft. Introduced in 1812. Flowers scarlet; June and July 



& 28. R. ARBORE'SCENS Torr. (A.ARBORE'SCENSPA.) The arborescent Azalea 



Identification. Torr., 1. c. ; Don's Mill., 3. p. 847. 



Synonymes. Azalea arborescens Pursh Fl. Amer. Sept. 1. p. 153. ; A. arbbrea Bart. Cat. 



Engravings. Our fig. 1138. from a specimen in the herbarium of Professor DeCandolle. 



Spec. Char., fyc. 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 10ft. 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 

 pubescent as those of the other species. The scales 

 of the flower buds are large, yellowish brown, and surrounded with a fringed 

 white border. 



1138. fi. arborescens. 



vii. R/iodwa 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.) 



j 29. R. J?HODO V RA G. Don. (#HODO'RA CANADE'NSIS L.) 

 The Canada Rhodora. 



Identification. Don's Mill., 3. p. 843. 

 Synonyme. ./Zhoddra canadensis Lin. Sp. 561. 

 Engravings. Bot. Mag., t. 474. ; and our fig. 1139- 



Spec. Char., fyc. Leaves 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. 



GENUS XXII. 



1130. R. fihodira. 



J 



KA'LMIA L. THE KALMIA. Lin. Syst. Decandria Monog/nia. 



Identification. Lin. Gen., No. 545. ; Don's Mill., 3. p. 850. 

 Synonyme. American Laurel. 



Derivation. Named by Linnaeus in honour of Peter Kalm, professor at Abo, in Sweden ; author of 

 Travels in America in 1753. 



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 



