278 The Ohio Naturalist. [Vol. V, No. 4, 



11. Leaves palmately veined; shrubs with green twigs parasitic on 

 trees; twigs wnth self-pruning joints. PHORADENDRON. 



11. Leaves pinnately veined; plants not parasitic. 12. 



12. Leaves oval, the upper perfoliate, glabrous; twining plants. 



LONICERA. 

 12. Leaves oblong or oval, coriaceous, not perfoliate; shrubs or trees. 



KALMIA 



12. Leaves obovate or orbicular, hairv, crenulate, not perfoliate- stem 



trailing. LINN^A. 



13. Leaves serrate, serrulate, crenate, or dentate. 14. 

 1.3. Leaves entire. 15. 



14. Leaves somewhat hairv; shrubs with thorns or thorn-like spurs 



GOTO N EASTER. 

 14. Leaves glabrous, very aromatic, oval to obovate, J^ in. long; low 



slender trailing plknt. GAULTHERL'V. 

 14. Leaves glabrous, bitter, white beneath, }4.-]/2 in- l<*ng; slender 



trailing or ascending plants in bogs. OXYCOCCUS. 



14. Leaves with prominent scurfv scales; erect shrubs without thorns. 



CHAMvEDAPHNE. 

 1.5. Leaves glabrous. Ki. 

 1.5. Leaves pubescent or woolly at least below. 17. 



16. Leaves green on both sides, thick, coriaceous, oblong to oblance- 



olate, 5-10 in. long; winter buds very scaly. RHODODENDRON 

 1(). Leaves green on both sides or glaucous beneath, coriaceous, 2-5 in. 



long, oval to oval-lanceolate; winter buds naked; erect shrubs. 



KALMIA. 

 10. Leaves white beneath, linear-lanceolate, revolute-margined, acid, 



1-23^ in. long; a bog shrub. ANDROMEDA. 

 If). Leaves white beneath, revolute-margined, bitter, }^--Yi in. long; 



slender trailing or ascending plants in bogs. OXYCOCCUS. 



17. Leaves revolute-margined. LS. 



17. Leaves not revolute-margined. 19. 



15. Leaves with a fragrant odor, densely tomentose beneath; erect 



resinous shrubs. LEDUM. 



18. Leaves 2-ranked, sinall, oval or ovate, hairv; creeping shrubs. 



CHIOGENES. 

 l'.(. Leaves lanceolate, mucronate, not evergreen; buds clustered at the 

 tip of the twig; trees with 5-angled pith. QUERCUS. 



19. Leaves oval or nearly orbicular, hirsute beneath; twigs hirsute; 



prostrate shrubs. EPIG^EA. 



19. Leaves spatulate, minvitelv pubescent, with hairs on the margins; 



trailing or spreading shrubs. ARCTOSTAPTIYLOS. 



— 20 — 



20. Climbing monocotyls with scattered vascular bundles, green bark, 



and two tendrils on the persistent petiole base; often prickly. 



SMI LAX. 



20. Not with scattered vascular l)undles Init with a ring of wood, true 



bark, and a central pith, 21. 



21. Twigs with thick wart-like dwarf branches; conifers. 22. 



21. Twigs without true dwarf branches. 23. 



22. Young twigs covered with scales. LARIX. 



22. Twigs without scales. GINKGO. 



23. Twigs with numerous small scattered self-]:runing scars, without 



a])])arent leaf scars but with minvite dry scale leaves. 24. 



23. Twigs with evident leaf scars and lateral winter buds. 25. 



24. Trees with feather-like dwarf branches, some usually remaining in 



winter; foliage leaves spreading into two ranks; roots often with 

 knees; a conifer. TAXODIUM. 



