Keys Leaves Axtebnate 



xxxvii 



402. 



403. 



Glabrous: leaves not whitened or veiny. p. 73. Lauras. 

 Pubescent or else leaves whitened or veiny, p. 70. Persea. 

 Leaf-scars on dilated or ribbed leaf-cushions. 404. 

 Leaf-scars not on dilated or ribbed leaf-cushions. 421. 

 Evergreen: leaves compound or serrate or glandular 



or varnished. 405. 

 Deciduous or else leaves not as above. 407. 

 Leaves at most finely toothed. p. 120. Cercocarpus. 



Leaves with about 5 revolute lobes. 406. 

 Bud-scales 2: stipules lacking. 

 Forming spurs with leaf-bases. 

 With bud-like axillary spurs. 408. 

 Not producing such dwarf-branches. 

 Twigs hairy but not glandular. 



p. 118. 

 p. 119. 



Fallugia. 

 Cowania. 



410. 



p. 133. 



Acacia. 



Twigs at first glandular-bristly: bark exfoliating. 409. 

 Stipules small (scarcely 1 mm. long). p. 121. Purshia. 

 Stipules large (fully 5 mm. long). p. 155. Calophaca. 



Buds globose, thicker than twig. p. 153. Halimodendron. 

 Buds ellipsoid: twig rounded. p. 117. Potentilla. 



Without either of these combinations of characters. 411. 

 Twigs essentially terete. 413. 

 Twigs evanescently angled at the nodes. 412. 

 Twigs conspicuously corrugated or angled or ribbed. 417. 

 With peristent stipules. p. 100. Cotoneaster. 



Without persistent stipules. p. 94. Spiraea. 



Low, compact and spreading. p. 293. Arctous. 



Not matted or spreading on the ground. 414. 

 Leaf-cushion equaling the bud. 

 Leaf-cushion much shorter than the bud. 

 Without persistent stipules. 416. 

 Stipules persistent. 

 Bud-scales indistinct. 

 Bud-scales evident. 

 Twigs corrugated: rush-like. 

 Twigs strongly angled or ribbed: 



p. 152. 

 415. 



Colutea. 



p. 100. Cotoneaster. 



p. 146. Cytisus. 



p. 94 Spiraea. 



p. 145. Spartium. 



not rush-like. 418. 



