ORDER 37. SAPINDACE^. 73 



Leaves simple. Flowers perfect (or all abortive in cultivation) Nos. 10, 11 



Leaves compound. Flowers dioecious. A tree. South Florida No. 9 



Leaves compound. Flowers polygamous. . .(a) 



a Flowers in clustered spikes preceding the trifoliate leaves No. 8 



a Flowers in axillary panicles, with the 3-13-foliate Ivs. Poisonous Nos. 57 



a Flowers in terminal thyrses, with the 9-31-foliate leaves . . . (b) 



b Common petiole winged between the leaflets No. 4 



b Common petiole not winged Nos. 1 3 



1 R. glabra L. Lvs. and branches glabrous ; Ifts. 1131, lanceolate, acuminate, 



acutely serrate, whitish beneath ; fr. red, with crimson hairs. Thickets and pastures. 

 6 15f. The fruit hairs are extremely acid, and dye red. June, July. 



2 R. typlilna L. Branches and petioles densely villous ; Ifts. 11 31, oblong-lanceo- 



late, acuminate, acutely serrate, pubescent beneath ; fruit red, with crimson hairs. 



Rocky soils. 10 20f. Branches thick, straggling. Drupes acid. Wood yellow. June. 



/3. laciniaia. Lfts. irregularly gashed; panicles leafy. Hanover, N. H. (Eicard.) 



3 R. pumila MX. Procumbent, villous-pubescent ; Ifts. 9 13, oval or oblong, coarsely 



toothed ; drupes red, silky pubescent. N. Car. to Ga. Branches If high. 



4 R. copallina L. Mountain Sumac. Branches and petioles pubescent ; Ifts. 921, 



oval-lanceolate, mostly entire, unequal at base, common rachis winged ; fls. in dense 

 panicles ; drupes red, hairy. Eocky hills. 2 8f. Thyrse sessile. July. 



5 R. venenata DC. Poison Sumac. Dog-wood. Very glabrous ; Ifts. 7 13, oval, ab- 



ruptly acuminate, very entire ; panicles loose, axillary, pedunculate ; drupes greenish- 

 yellow, smooth. Swamps. 10 15f. Flowers green. Very poisonous. June. 



6 R. Toxicodendroii L. Poison Oak. Poison Ivy. Erect, or decumbent ; Ivs. pu- 



bescent ; Ifts. 3, broadly oval, acuminate, angular, or sinuate-dentate ; drupes smooth, 

 roundish. Thickets, Can. to Ga. Perhaps runs into the next. June. 



7 R. radicans L. Climbing Ivy. Stems climbing by means of innumerable radi- 



cating tendrils ; leaflets ovate, smooth, entire. Ascending tree?, 20 50f. Drupes 

 dull white. Stems 1 2' in thickness. June. 



8 R. aromatica Ait. Sweet Sumac. Lfts. sessile, incisely creuate, pubescent be- 



neath, lateral ones ovate, terminal one rhomboid ; fls. in close aments, preceding the 

 leaves ; drupe globous, villous. Copses. 2 6f. Flowers yellowish. May. 



9 R. Uletopium L. Lfts. 37, smooth, entire, ovate, acuinin. ; drupes smooth. 301. 



10 R. cotinoides N. Smooth; IVP. oval, obtuse, entire, acute at base, thin, long- 

 stalked : fls. minute, in loose, erect panicles ; drupes smooth. Mts. Car. to Ark. 



11 R. COTINUS. Venetian Sumac. Smoke-tree. Lvs. obovate, entire, thick; flowers 

 mostly abortive, pedicels diffusely branched and hairy. Italy. 



ORDER XXXVII. SAPINDACEJE. MAPLEWORTS. 



Trees, shrubs, or rarely herbs, with simple or compound, alternate or 

 opposite leaves. Flowers mostly unsynimetrical, often irregular, 4 or 5- 

 merous, with the sepals and petals both imbricated in the bud, with the 

 stamens 5 to 10, inserted on a hypogynous or perigyuous disk. Ovary 2 or 

 3-celled, lobed, and with 1 or 2 (rarely more) ovules in each cell. Embryo 

 mostly curved or convoluted, with little or no albumen. Figs. 100, 224, 

 230, 236, 237, 308, 312, 444, 515. 



I. ACERINEjE. Leaves opposite. Flowers regular, diclinous. Fruit a double samara... (a) 



a Disk annular. Petals 4 or 5 or 0. Leaves simple, lobed ACER. 1 



a Disk obsolete. Petals none. Leaves pinnately compound NEGUNDO. 2 



II. STAPHYLEjE. Leaves opposite. Flowers regular, perfect. Stamens 5 STAPHTLKA. 3 



III. HIPPOCASTANE^E. Leaves opposite. Flowers irregular. Stamens 7 ^ESCULUS. 4 



IV SAPINDE^E. Leaves alternate. Flowers polygatno-dicecious ... (5) 



4 



