Oxydendrum (p. 796). Leaves ovate to elliptic, stellate-pubescent or glabrous, turning yellow in the autumn. Halesia (p. 824). _cc_ Leaves palmately lobed. Stipules large, foliaceous, united; branchlets without a terminal bud. Platanus (p. 371). Stipules small, free, caducous; branchlets with a terminal bud. Liquidambar (p. 367). †† Leaves inconspicuous or wanting; branches spiny or prickly. Branches or stems succulent, armed with numerous prickles. Branches and stems columnar, ribbed, continuous; leaves 0. Cereus (p. 757). Branches jointed, tuberculate; leaves scale-like. Opuntia (p. 759). Branches rigid, spinescent. Leaves minute, narrow-obovate. Branchlets bright green. Kœberlinia (p. 754). Branchlets red-brown. Dalea (p. 621). Leaves scale-like, caducous. Canotia (p. 677). 2. Leaves compound. * Leaves 3-foliolate, without stipules. Leaves persistent; leaflets obovate, entire, sessile. Hypelate (p. 716). Leaves deciduous. Leaflets deltoid to hastate, entire, rounded at apex; branches prickly. Erythrina (p. 627). Leaflets ovate to oblong, acuminate, strongly scented and bitter; branches unarmed. Ptelea (p. 639). ** Leaves twice pinnate; stipules present.