PACHISTIMA 139 



minute, half -elliptical; bundle-trace 1, indistinct; stipule-scars 

 none. 



1. P. canbyi Gray. Canby's Mountain-lover . Dwarf shrub with 

 rooting "branches ascending to 25 cm. ; leaves linear, serrulate, 

 obtuse, revolute, 6-25 mm. long; fruit a pod about 4 mm. long. 

 Rocky limestone slopes, Virginia, West Virginia, Kentucky, and 

 Ohio (Fig. 191). 



CELASTRUS L. (Celastraceae) 



Deciduous woody climbers. Stems terete, slender; pith large, 

 continuous, round, white. Buds small, solitary, sessile, subglo- 

 bose, with about 6 mucronate scales. Leaf-scars alternate, half- 

 elliptical; bundle-trace 1; stipule-scars minute. 



1. C. sc and ens L. Climbing Bittersweet . A twining shrub, 

 climbing to 7 m. or higher; stems and buds glabrous, brownish- 

 gray; fruit a globose pod opening in autumn and exposing the orna- 

 mental scarlet seeds, persistent into winter. Thickets, Quebec to 

 Manitoba, soutli to Georgia, Louisiana, and Oklahoma (Fig. 192). 



STAPHYLEA L. (Staphyleaceae) 



Deciduous shrubs or small trees. Twigs moderate, rounded, 

 glabrous; pith rather large, continuous, white. Buds solitary, ses- 

 sile, ovoid, glabrous; terminal bud usually lacking. Leaf- scars 

 opposite (sometimes somewhat separated), half-round; bundle- 

 traces 3 or broken into 5 or 7 or more; stipule-scars rounded or 

 elongated. Fruit an inflated capsule persistent in winter, the seeds 

 rattling when the capsule is shaken. 



1. _S. trifolia L. Bladdernut. An upright shrub up to 5 m. high, 

 with smooth striped bark; buds with 4 blunt exposed scales; pods 

 3-lobed, 3-4 cm. long. Rich thickets, Quebec to Minnesota, south 

 to Georgia, Arkansas and Oklahoma (Fig. 193). 



ACER L. (Aceraceae) 



Deciduous shrubs or trees. Twigs moderate, rounded; pith 

 continuous, pale. Buds moderate, solitary or collaterally multiple, 

 ovoid or conical, sessile or stalked, with 1 or several pairs of ex- 

 posed scales. Leaf- scars opposite (very exceptionally whorled in 

 some individuals), curved or U-shaped; bundle-traces usually 3, 

 but sometimes 5, 7, or 9, or more numerous; stipule- scars none. 



