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Harrisoniæ, Brazil, with Catt. citrina, Mexico; Loelia anceps, Mexico, with Epidendrum ciliare, U.S. Colombia. In other genera there are several hybrids of Mexican and South American parentage; as L. anceps × Epid. ciliare, Sophronitis grandiflora × Epid. radicans, Epid. xanthinum × Epid. radicans.
This species is of half-scandent habit, with large, trifoliolate leaves, which turn of various tints of red and crimson in the autumn. It is quite hardy, and seen to best advantage when allowed to run over large rockwork and tree stumps in partial shade. The variety R. toxicodendron radicans has ample foliage, and is suited for similar places to the last.
They have been described by Sir Charles Bunbury and Professor Heer, and the former first pointed out that many of the leaves are of the laurel type, and analogous to those now flourishing in the modern forests of Madeira. He also recognised among them the leaves of Woodwardia radicans, and Davallia Canariensis, ferns now abundant in Madeira.
Woodwardia radicans is a superb, broad-shouldered fern five to eight feet high, growing in vase-shaped clumps where tile ground is nearly level and on some of the benches of the north wall of the Valley where it is watered by a broad trickling stream. It thatches the sloping rocks, frond overlapping frond like roof shingles.
Rhus radicans differs from this in having a more trailing habit of growth; otherwise it is scarcely different, so little so, as to baffle a distinction being made by description alone. The substances that deaden the effects of the poisons of this class are vegetable acids, which should be thrown into the stomach in large quantities.
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