142 NYSSACEAE. 



10. Leaves rough above : twigs rough-hairy. C. asperifolia. 

 Leaves smooth above, n. 



11. Leaves rather lanceolate. C. Baileyi. 

 Leaves rounded, acuminate : twigs greenish. C. rugosa. 



12. Twigs rather gray. C. racemosa. 

 Twigs yellow. C. stolonifera flaviramea. 

 Twigs very red or purple. 13. 



13. Twigs red. 14. 



Twigs purple. C. alba Kesselringii. 



14. Rather erect : leaves impressed-veiny : lateral buds distinctly 



stalked and elongated (5-8 mm. including stalk) : twigs 

 very bright red. C. alba sibirica. 



Drooping and rooting : lateral buds nearly sessile ; short 



(3 mm.) : twigs rather purplish. C. stolonifera. 



AUCUBA. 



Evergreen shrubs with moderate twigs ; alternate moder- 

 ate glossy leaves ; small dioecious 4-merous polypetalous pani- 

 cled flowers; and typically red I -seeded drupes. 



1. Not variegated. A. japonica. 

 Yellow-margined. A. japonica limbata. 

 Yellow-mottled. 2. 



2. Mottling rather uniform and fine. A. japonica variegata. 

 Central yellow spot large. 3. 



3. Without smaller spots. A. japonica bicolor. 

 With scattered smaller spots. A. japonica latimaculata. 



Family NYSSACEAE. Tupelo Family. 



A very small family yielding the important tupelo-gum or 

 black-gum lumber; the following one of the best of autumn 

 coloring trees. 



NYSSA. Tupelo. 



Deciduous moderate-sized trees with pale close wood with 

 minute diffused ducts and very close fine medullary rays ; 

 moderately slender or rather stout terete twigs ; rounded con- 

 tinuous pith with firmer diaphragms ; alternate somewhat raised 

 broadly crescent-shaped leaf-scars with 3 bundle-traces ; no 



