68 ANACARDIACE.E. 



2. R. COPALLTXA, L. Dwarf Sumach. 



Branches and stalks downy ; leaflets 4 to 7-pairs, oval-lanccolatc, or oblong, vtry 

 •ntire, shining on the upper surface, pubescent beneath, unequal at base; common 

 petiole winged, appearing as if jointed. 



Rocky hills and dry fields. July. August. Shrub 2 to 7 feot high with running 

 foots. Common petiole about G inches long expanding into a leafy margin, betwei n 

 each pair of leaflets. Leaflets 1 to 3 inches long, near )4 as wide, dark green and 

 glossy on the upper surface. Flowers dioecious, yellowish-green. Fruit red, small, 

 compressed, hairy, acid, and bitter. 



3. R. TYPHINA, L. Stag-horn Sumach. 



Branches and petioles densely villous; leaflets G to 15 pairs, oblong-lanccolatie, 

 acuminate, acutely serrate, whitish beneath. 



" Hillsides or low barren places. June. A large shrub, or a spreading tree, 15 

 to 30 feet high with orange-colcred aromatic wool and copious milky resinoua 

 Juice. Flowers greenish-yellow, dioecious. Fruit in clusters, covered with a velvety 

 purple down, acrid. 



• * Poisonous to the touch : fruit smooth : panicles axSkuy. 



4. R. venenata, DC Poison Sumach. 



Smooth ; leaves odd-pinnate, 3 to 6 pairs, oval abruptly acuminate, very entire. 

 panicles loose, pedunculate. 



Margins of swamps. June. July. A shrub or small tree of fine appearance. 10 

 to 15 feet high. Petioles 6 to 10 inches long, red. Leaflets about 3 inches long, 

 nearly x / 2 as wide, sessile, except the edd one. Flowers very Email, grceni>: . 

 rious. Fruit about as large as a pea. The whole plant is very poisonous, tainting 

 the air to some distance around with its pernicious effluvium, 



5. R. Toxicodendron. L. Poison Oak. 



Erect or decumbent; leaves ternate; leaflets broad-oval or rhomboid, entire, 

 rinuate or lobed, somewhat pubescent: flowers in racemose axillary BUb-seasO* 

 panicles. 



Moist woods and thickets. June. A small shrub, 1 to 3 feet high, nearly rmooth 

 In all its parts. Leaflets 2 to 6 inches long % as wide, pctiolate, the cemmon 

 petiole 4 to 5 inches long. Flowers small, dioecious, greeuish-ycllcw. Fruit 

 smooth, roundish, pale-brown. Poisonous. 



Var. b. kadioaxs. Torr. (R. radicans. Linn, DeCandolle and Beck.) Fviscn Ivy. 



Stem climbing; leaves ternate; leaflets pctiolate, ovate, acuminate, smcoth, gen- 

 erally entire; flowers in axillary racemes towards the top of the stem, di.ecieus. 



Wools and hedges. June. Stem climbing by myriads of rcoting tendrils 10,, 20 

 or 50 feet. Flowers yellowish-green. Fruit suh-globofe, brown. 



• * * Leaves ternate ; flowers dicccious, not poisonous, aromatic. 



6. R. AROMATICA, Ait. Fragrant Sumach. 



Branches slender, nearly smooth; leaves ternate: leaflets rhombic-ovate. irnniTf 

 the middle one wedge-shaped at the base, unequally cut-tcothcJ, pubescent when 

 young. 



Dry rocky soil: rare. April. May. A small aromatic shrub 2 to G feet high- 

 Leaflets 1 to 2 inches long, \A as wide, the common petioles 1 to 2 inches long. 

 Flowers yellowish, in clustered scaly-1 -ractcd spikes like catkins, preceding the 

 leaves. Fruit red, acrid, more or less hisped. 



7. R. COTINUS. Venitian Sumach. 



A small shrub, cultivated : native of Arkansas, according to XuttaJl. remarkable 

 ctkiefly for the singular and ornamental appearance of its long, diffuse feathery 

 fruitrstalka, showing in the distance as if the plant were enveloped in a clcud of 

 fmcko. 



