274 



ERICACEAE. 



R. ferrugineum. 



X R. arbutifolium. 



R. minus. 



X R. myrtifolium. 



R. carolinianum. 



R. catawbiense. 



13. Leaves small (1x4 cm.), mucronate. 

 Leaves larger (1.5x5 cm.), acute. 



14. Twigs red-brown. 



Twigs green or reddish. 15. 



15. Leaves obscurely crisped or crenulate. 

 Leaves quite entire. 



16. Leaves broadly elliptical, round-based. 



Leaves elongated-oblanceolate, acute-based. R. maximum. 



17. Buds glabrous except for occasional stalked glands. 18. 

 Buds glandular-dotted. 22. 



Buds puberulous. 23. 



Buds with long appressed hairs. 27. 



18. Leaf -scars raised, scarcely notched. (3). R. Vaseyi. 

 Leaf-scars not raised. 19. 



19. Pedicels tomentulose and with glands. R. japonicum. 

 Pedicels glabrous except for long glands. 20. 



20. Twigs entirely glabrous. R. arborescens. 

 Twigs usually sparsely long-hairy. 21. 



21. Buds brown. 



calendulaceum. 



R. nudiflorum. 



R. dahuricum. 

 mucronulatum. 

 . R. canadense. 



Buds rosy. 



22. Twigs red-orange. 



Twigs buff-orange. (2). R. 



23. Leaf -scars slightly raised. (4) 

 Leaf-scars not raised. 24. 



24. Twigs reddish. R. luteum. 

 Twigs buff or gray. 25. 



25. Twigs tomentulose, at least near the tip. R. canescens. 

 Twigs glabrate or with stalked glands. 26. 



26. Capsules with spreading glands. R. viscosum. 

 Capsules with ascending hairs. (5). R. nudiflorum. 



27. Leaf-scars distinctly raised. . R. albiflorum. 

 Leaf -scars not raised. (6). R. rhombicum. 



