4S4 



ANACARDIAil'.AE. 



Vol. II. 



2. Toxicodendron radicans (L.) Kuntzc. I'oison, Climbing or Three-leaved 



Poison Oak. Climath. Fig. 2782. 



Rhus radicans L. Sp. PI. 266. 1-53. 



Rliiis Toxicodendron of American authors, in 



part, not L. 

 To.ricodcndron vulgare Mill. Gard. Diet. Ed. 



8, no. I. 1768. 

 Rhus niicrocarpa Steud. Noinenel. 689. 1S21. 

 T. radicans Kuntze, Rev. Gen. 153. 1891. 



A woody vine, climbing by numerous 

 aerial rootlets, or erect and busby, tbe 

 stem sometimes 3-4' in diameter. Leaves 

 petioled, 3-foliolate, glabrate or somewhat 

 pubescent,especially beneath ; leaflets ovate 

 or rhombic, i'-4' long, entire or sparingly 

 dentate or sinuate, acute or short-acumi- 

 nate at the apex, the lateral sessile or 

 short-stalked, inequilateral, the terminal 

 one stalked, rounded or narrowed at the 

 base: flowers green, il" broad, in loose 

 axillary panicles, 1-3' long: fruit similar 

 to that of the preceding, il"-2i" in diam- 

 eter, glabrous, or sparingly pubescent. 



Thickets and along fences, etc., often as- 

 cending high trees, Nova Scotia to British 

 Columbia, Florida, Arkansas, Texas and 

 Mexico. Bermuda ; Bahamas. Very poison- 

 ous. Consists of many races, differing in 

 habit, shape of leaflets and pubescence. 

 Trailingor climbing sumac. Mercury. Black 

 mercury-vine. Markry. Mark-weed. Picry. 

 May-June. 



Toxicodendron Rydbergii (Small) Greene, an upright shrub with thicker leaves and larger 

 fruit, enters our western limits in Kansas and North Dakota. 



3. Toxicodendron Toxicodendron 



(L. ) Dritton. Poison Oak. 

 Fig. 2783. 



Rhus Toxicodendron L. Sp. PI. 266. 1753. 



T, j^ubescens Mill. Gard. Diet. Ed. 8, no. 2. 

 1768. 



R. Toxicodendron quercifolium Michx. Fl. 

 Bor. Am. i : 1S3. 1803. 



R. quercifolia Steud. Nomencl. 689. As syno- 

 nym. 1 82 1. 



A low branching shrub, 3 high or less, 

 spreading by underground branches, the 

 young shoots densely pubescent. Leaves 

 long-petioled, 3-foIiolate: leaflets ovate to 

 obovate in outline, firm in texture, dark 

 green and sparingly pubescent above, paler 

 green and densely velvety-pubescent be- 

 neath, 4' long or less, irregularly lobed, 

 toothed or sinuate-margined; panicles i'-3' 

 long; petals oblong, obtuse, veined; fruit 

 pubescent when young, smooth or some- 

 times papillose when mature, depressed- 

 globose, 3"-4i" in diaiueter. 



Dry woodlands, southern New Jersey and 

 Delaware to Georgia, Alabama and Texas. 

 April-May. 



4. COTINUS Adans. Fam. PI. 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, tbe 

 segments imbricated, obtuse. Petals longer than the calyx, imbricated. Stamens 5. Ovar}' 

 obovoid; styles 3, lateral; stigmas .very small. Drupe obliquely oblong or oval, compressed, 

 gibbous, i-seeded. Seed nearly as in Rhus. [Greek name of the oleaster, or wild olive.] 



Two known species, the following of southeastern North America, the other, Cofinus Colinus 

 (L.) Sargent, the generic type, native of Europe and Asia. 



