“Ad olute 
{ 
388 ANACARDIACEAE. [Vor. II. 
6. Rhus Vérnix L. Poison Sumac. Poison Elder. (Fig. 2352.) 
Rhus Verntx I,. Sp. Pl. 265. 1753- 
Toxicodendron pinnatum Mill. Gard. Dict. 
Ed. 8, no. 4. 1768. 
Rhus venenata DC, Prodr. 2:68. 1825. 
A shrub or small tree, with maximum 
height of 25° and trunk diameter of 6’. 
Leaves petioled, pinnate, 6’-15/ long, gla- 
brous or somewhat puberulent; leaflets 7- 
13, thin, obovate, oval, or the lowest ovate, 
2/-4/ long, 1’-114’ wide, green both sides, 
entire, short-acuminate at the apex, nar- 
rowed or rounded at the base, short-stalked; 
rachis terete; flowers green, about 1/’ 
broad, in loose axillary panicles 3/-8’ long; 
drupe globose-oblong, 2’ in diameter, 
gray, glabrous; stone striate. 
In swamps, southern Ontario and near the 
coast in the Eastern and Middle States, south 
to Florida, west to Minnesota, Missouri and 
Louisiana. Very poisonous. Wood soft, yel- 
lowish brown; weight per cubie foot 27 lbs. 
June. Called also Poison Ash, Swamp or 
Poison Dogwood. 
7. Rhus radicans L. Poison, Climbing or Three-leaved Ivy. Poison Oak. 
: Climath. (Fig. 2353.) 
Rhus radicans 1. Sp. Pl. 266. — 175 ] 
3 
Rhus Toxicodendron of American authors, : \ 
in part, not L. | 
Toxticodendron vulgare Mill. Gard. Dict. |) 
Ed. 8, no. 1. 1768. ~ 
A woody vine, climbing by numerous } 
aerial rootlets, or erect and bushy, the 
stem sometimes 3/-4’ in diameter. 
Leaves petioled, 3-foliolate, more or less 
pubescent, especially beneath; leaflets 
ovate or rhombic, 1/-4’ long, entire or 
sparingly dentate or sinuate, acute or 
short-acuminate at the apex, the lateral 
sessile or short-stalked, inequilateral, the 
terminal one stalked, rounded or nar- 
rowed at the base; flowers green, 114/’ 
broad, in loose axillary panicles, 1/-3/ 
long; fruit similar to that of the preceding. 
Thickets and along fences, etc., often as- 
cending high trees, Nova Scotia to Brit- 
ish Columbia, south to Florida, Arkansas 
and Utah. Ascends to 2200 ft. in Virginia. 
Very poisonous. May-June. 
Rhus Toxicodendron I,., is a shrub of the 
Southern States, with crenately-lobed very 
pubescent leaflets. 
2. COTINUS Adans, Fam. Pl. 2: 345. 1763. 
Shrubs or small trees, with alternate petioled ovate oval or obovate entire leaves, and 
small polygamous slender-pedicelled flowers in large terminal panicles. Calyx 5-parted, the 
segments imbricated, obtuse. Petals longer than the calyx, imbricated. Stamens5. Ovary 
obovoid; styles 3, lateral; stigmas very small. Drupe obliquely oblong or oval, compressed, 
gibbous, t-seeded. Seed nearly asin Rhus. [Greek name of the oleaster, or wild olive. ] 
Two known species, the following of southeastern North America, the other of Europe and Asia. 
