GLEDITSIA 129 



and marked with large oblong conspicuous lenticels, on older 

 trunks roughened by scattered shallow fissures and thick firm 

 broad plates; trunk thickly beset with large branching thorns 

 (thorns absent in f. inermis (Pursh) Schneid. ). Rich woods. New 

 York to South Dakota, south to Florida and Texas (Fig. 169). 



CERCIS L. (Leguminosae) 



Deciduous shrubs or small trees. Twigs moderate, zigzag, 

 subterete; pith roundish, continuous, pale or pinkish. Buds gla- 

 brous,the flower-buds superposed and stalked, the leaf-buds ses- 

 sile, ovoid or obovoid, with 2 scales (or several in the flower 

 buds); end-bud lacking. Leaf-scars alternate, 2-ranked, some- 

 what raised, fringed at the top, obtusely triangular, with 3 small 

 decurrent ridges; bundle-traces 3; stipule-scars lacking. 



1. C. canadensis L. Redbud. Shrub or small tree 8-10 m. 

 high; bark thin, with shallow grooves and dark brown scaly ridges; 

 twigs dark brown or black; pith round, pale or pinkish, continuous; 

 buds 2-3 mm. long; pods brown, 6-8 cm. long, 12 mm. wide, per- 

 sistent in winter. Rich woods, Florida to Texas and Mexico, north 

 to Connecticut, Ontario and Wisconsin (Fig. 170). 



CLADRASTIS Raf. (Leguminosae) 



Handsome trees with yellow wood, smooth bark, and deciduous 

 leaves. Twigs moderate, terete, somewhat zigzag; pith moderate, 

 round, continuous, pale. Buds sessile, either solitary and scaly 

 or in superposed groups and not distinctly scaly; end-bud lacking. 

 Leaf-scars alternate, 2-ranked, half-round or horseshoe-shaped 

 and encircling the bud; bundle-traces 3 or 5; stipule-scars lacking. 



1, C. lutea (Michx. f . ) K. Koch. Yellowwood. Virgilia. A 

 small tree to 17 m. high; twigs red-brown; buds short, scarcely 

 5 mm. long. Rich woods, especially on limestone outcrops, 

 Missouri, Illinois and Kentucky, south to Georgia and Alabama. 



CYTISUS L. -^ (Leguminosae) 



Small shrubs, commonly deciduous. Twigs slender, terete or 

 more usually ribbed or grooved; pith small, roundish, continuous. 

 Buds small, solitary, sessile, round-ovoid, with about 4 scales. 

 Leaf-scars alternate, elevated on a leaf-cushion, minute; bundle- 

 trace 1, indistinct; stipules or minute stipule-scars present. 



