. Les arbres de l'Amérique du Nord : être des descriptions et des illustrations de l'arbres croissant indépendamment de la culture en Amérique du Nord, au nord du Mexique et les Antilles . Les arbres. 6io Poison Sumacs vénéneux ces qualités. Les feuilles de ces plantes sont inégalement pennées ou 3-foliolate, les tracts soit ensemble-chat, ou des dents ou diversement lobées. Les petites fleurs vertes sont en grappes axillaires ou latéral, habituellement panicules ; ils sont soit polygame ou dioïque ; le 4 à 6 sépales sont persistantes à la base du fruit ; il y a 4 à 6 pétales et habituellement le plus grand nombre d'étamines, celles de la pi

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. North American trees : being descriptions and illustrations of the trees growing independently of cultivation in North America, north of Mexico and the West Indies . Trees. 6io Poison Sumacs these poisonous qualities. The leaves of these plants are unequally pinnate or 3-foliolate, the leaflets either entire-margined, or variously toothed or lobed. The Small green flowers are in axillary or lateral clusters, usually panicles; they are either dioecious or polygamous; the 4 to 6 sepals are persistent at the base of the fruit; there are 4 to 6 petals and usually as many stamens, those of the pistillate flowers small and usually abortive; the ovary in the pistillate flowers is one-celled, enclosing i pendulous ovule. The fruit is a drupe, with a thin smooth outer coat, which early separates and falls away from the inner, which is waxy and encloses a ribbed stone. The type species is Toxicodendron vulgare Miller, one of the Poison Vines of eastern North America. Only one of the several North American species forms a tree. POISON SUMAC— Toxicodendron Vemix (Linnaeus) Shafer Rhus Vemix Linnaeus. Rhus venenata de Candolle This small tree inhabits swamps and occurs from southern Ontario and Ver- mont to eastern Massachusetts and Florida, westward to Minnesota, Arkansas, and Louisiana. It is also known as Poison elder. Poison ash. Poison oak, Swamp dogwood, and Poison dogwood, and is dangerously poisonous to the touch. It sometimes attains a height of 8 meters, with a trunk 1.5 dm. in diameter, but is usually smaller, and often a mere shrub. Some people are said to be affected by coming close to the plant without act- ually touching it. The smooth bark is thin and light gray. The young twigs are smooth, brown or orange-brown. The buds are pointed, purplish, the terminal ones 2 cm. long or less, their scales finely hairy. The leaves are smooth, except when quite young, when they are quite hairy; when fully grown they are 1.5 to 4 dm. long, their stalks round and slender, t

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