The oakleaf poison-ivy usually does not climb as a vine, but occurs as a low-growing shrub. Stems are usually upright in their general growth habit, as they appear in figure 10. The shrubs usually have rather slender branches, often covered with a fine pubescence that gives the plant a kind of downy appearance. The leaflets occur in threes, as in other ivy, but are lobed, somewhat on the general plan of the leaves of some kinds of oak. The middle leaflet usually is lobed somewhat alike on both margins and very much resembles a small oak leaf, while the two lateral leaflets are often irregularly lobed. The leaves shown in figure 11 are a common form. The lighter color on the under side of one of the leaves (fig. 11, _A_) is due to the pubescence, or fine hairs, on the surface. The range in size of leaves varies considerably, even on the same plant; the leaf shown in figure 11, _B_, however, is about natural size. The fruit of oakleaf poison-ivy has the same general appearance as the fruit of common poison-ivy shown in figure 8, although the individual fruits and stems are often pubescent, while most of the other forms have a waxy, smooth, cream-colored fruit. _Figure 10._--Eastern oakleaf poison-ivy shrub. The upright growth as a low shrub is common. The three parts of each leaf somewhat resembles an oak leaf. The gall formations that cause wartlike protuberances are common on all species. _Figure 11._--Eastern oakleaf poison-ivy: _A_, Leaves, showing upper deep green surface and lower lighter colored surface. _B_, Single leaf, about natural size. The terminal leaflet more nearly resembles an oak leaf than the two lateral leaflets. WESTERN POISON-OAK The western poison-oak (_Rhus diversiloba_) of the Pacific Coast States is usually known as poison-oak, but is occasionally referred to as poison-ivy or yeara. It is likely to be found in the region designated by shading in figure 12, and from central Oregon northward through Washington may be growing intermixed with common poison-ivy. The term "poison-oak" is a misnomer, as this species is in no way related to the oak but is related to poison-ivy. Anyone familiar with either of these plants in their several forms will likely recognize the other, both as plants to be avoided. _Figure 12._--The shaded area is the region where the western poison-oak is likely to occur. Other forms may also be in the same region. The most common growth habit of the western poison-oak is in the form of a rank upright shrub with many small woody stems rising from the ground. It frequently grows in great abundance along roadsides (see fig. 16) and in uncultivated fields or on abandoned land.