94 HlPPOCASTANACEAE 



more or less soft corky gray or dark bark; pale rather soft 

 wood with minute diffused ducts and extremely fine medullary 

 rays; stout terete twigs; large somewhat hexagonal homogene- 

 ous pale pith; large digitate leaves; large opposite shield- 

 shaped leaf-scars with 3 or several bundle-traces in a single 

 series; ovoid buds, the terminal large, with several pairs of 

 exposed opposite scales; perfect paniculate showy polypetalous 

 flowers; and leathery capsules with 1 or several very large 

 roundish seeds. 



1. Buds gummy: leaflets subsessile, impressed-veiny. 2. 

 Buds not gummy. (Buckeyes). 12. 



2. Buds persistently gummy: leaflets often seven. 3. 

 Scales drying: leaflets mostly 5. X A. carnea. 



3. Trees* 4. 



Shrub. A. Hippocastanum pumila. 



4. Leaves unvariegated. 5. 

 Leaves variegated. 11. 



5. Leaflets merely toothed. 6. 

 Leaflets deeply cut. 9. 



6. Tree with ovoid top. 7. 



Tree with round top. A. Hippocastanum unbraculifera. 

 Tree pyramidal. A. Hippocastanum pyramidalis. 



7. Flowers single. (Horsechestnut). A. Hippocastanum. 

 Flowers double. 8. 



8. Flowers yellowish red. A. Hippocastanum Schirnhoferi. 

 Flowers white. A. Hippocastanum Baumannii. 



9. Tree with ovoid top. 10. 



Tree rather pyramidal. A. Hippocastanum Henkelii. 



10. Leaflets of usual outline. A. Hippocastanum laciniata. 

 Leaflets short and broad. A. Hippocastanum incisa. 



11. Variegation yellow. A. Hippocastanum variegata. 

 With white blotches. A. Hippocastanum Memmingeri. 



12. Fruit warty: bark softly corky. 13. 

 Fruit not warty. 14. 



13. Tree: leaflets mostly 5. (Ohio buckeye). A. glabra. 

 Shrub: leaflets mostly 7. A. glabra Buckleyi. 



