. The American entomologist. Entomology. ENTOMOLOGIST AND BOTANIST. 251 THE HOP-TREE OR WAFER-ASH. {PleUa tnfoUata. L.). Hujj-tree or Wafer Ash {PteUa trifoUata, L.) The Hop-tree {Ptelea trifoUata, L.) is a shrub or small tree of the natural order Bvtacece, to which belongs also the Rne of the gardens, the Prickly-ash (Zanihoxylum Americanum, Mill) and the Southern Prickly-ash (Z. Carolinianum, Lam.) In some respects these last-named arc medicinal as well as botanical analogues of the Hop-tree. The genus Ptelea has polygamous flowers, i. e., the perfect and imperfect flowers are variously mixe
. The American entomologist. Entomology. ENTOMOLOGIST AND BOTANIST. 251 THE HOP-TREE OR WAFER-ASH. {PleUa tnfoUata. L.). Hujj-tree or Wafer Ash {PteUa trifoUata, L.) The Hop-tree {Ptelea trifoUata, L.) is a shrub or small tree of the natural order Bvtacece, to which belongs also the Rne of the gardens, the Prickly-ash (Zanihoxylum Americanum, Mill) and the Southern Prickly-ash (Z. Carolinianum, Lam.) In some respects these last-named arc medicinal as well as botanical analogues of the Hop-tree. The genus Ptelea has polygamous flowers, i. e., the perfect and imperfect flowers are variously mixed. They have four or five stamens, and a thin, wing-like fruit, which is two-celled, but one cell only perfects seed. Its name, Ptelea. is the Greek for Elm, given be- cause of the resemblance of the wing-like or samaroid fruit. Its six known species are all Xorth American. Three are Mexican. One Southern species (P. mollis) is clothed with a silky pubescence. Another species, Ptelea Bald- winii, of East Florida, has minute leaves with obtuse leaflets. The remaining species, the sub- ject of our sketch, known in Britain as Shrubbv Trefoil, is indigenous throughout the United States, from the East to beyond the Mississippi, and even to Texas, in moist shady places, and on the borders of woods and among rocks. It is a tall shrub, but under cultivation at Gordon Castle. Scotland, it had, in , reached the height of forty-five feet, with a trunk fifteen inches in diameter, and with branches extend- ing twenty-seven feet from side to side. Two varieties have been found—one with five leaflets (P. Pentajjhylla, Mtench), the other with the branches, petioles and under surface of the leaves clothed with a soft tomentose pubescence, even when old (P. 2}itbeseens, Ph.) It was originally i-ent to England by Bannister, but being lost was reintroduced by ('atesby in 172i from Car- olina. It is common in the gardens of Europe; and in the Jardiu des Plants, at Paris, a tree may be seen t
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