CYRILLACEAE 85 



COTINUS. Smoke Tree. 



Aromatic-gummy deciduous shrubs or very small trees 

 with soft yellow wood with crowded moderate ducts in the 

 spring growth, dotted or transverse groups of minute ducts in 

 the summer growth, and fine but evident medullary rays; 

 roundish twigs; alternate raised crescent-shaped or 3-lobed 

 rather small leaf-scars with 3 or 5 bundle-traces; entire mod- 

 erately large slender-stalked simple leaves; inconspicuous poly- 

 petal ous flowers in terminal panicles; and small dry fruits on 

 feathery slender stalks. Frequently placed under Rhus. 



1. Leaves rather round and small (scarcely 8 cm. long). 2. 

 Leaves elliptical and large (10-16 cm. long). C. americanus. 



2. Not weeping. 3. 



Weeping. C. Coggygria pendulus. 



3. Leaves somewhat pubescent. C. Coggygria pubescens. 

 Leaves glabrous. 4. 



4. Hairs of inflorescence pale. C. Coggygria. 

 Hairs of inflorescence purple. C. Coggygria atropurpureus. 



Family CYRILLACEAE. 



A small family of no considerable use: the following some- 

 times found in shrubberies. 



CYRILLA. Black ti-ti. 



Subevergreen shrubs or small trees with rather hard 

 brownish wood with minute diffused ducts and fine but evident 

 medullary rays; rather slender 3-angled twigs; alternate some- 

 what raised triangular small leaf-scars with 1 bundle-trace; 

 solitary sessile small buds with several loose pointed scales; 

 simple moderately small cuneately short-stalked leaves; small 

 colorless perfect polypetalous flowers clustered in racemes from 

 the winter nodes; and small ovoid capsules on reflexed pedicels. 

 Leaves subacuminate, revolute, raised-veiny. C. racemiflora. 



CLIFTONIA. Buckwheat Tree. 



Evergreen hard-leaved shrubs with rounded smooth-barked 

 twigs; small rounded homogeneous pink pith; alternate low 



