| − | Populus angulata, Ait. Hybrid Carolina Poplar. ' Fig. 3138. For more than a century considered to be a native tree in the S., although by most botanists not clearly separated from P. deltoides, but Aiton's original specimens are interpreted by Henry to represent a hybrid of P. deltoides and P. nigra var. typica; similar forms are known in Europe and are planted in this country: known in both sexes: strong-growing tree with mostly prominently ridged or angled branchlets: lvs. triangular-ovate, always longer than broad, at the base truncate or more or less cordate, at the apex acute or short-acuminate, at maturity glabrous and firm in texture but slightly pubescent when young, glands 2-6 at base of blade or on apex of petiole, the margin except at apex with narrow translucent border, crenate-glandu- lar and ciliate with the teeth close together; petiole flattened: catkins 2-3 in. long, with small cucullate or concave-dentate (not filiform-lobed) scales; stamens 30-40. Henry suggested that the floral characters (as seen in Aiton's type) may be a mutation under European conditions, inasmuch as catkins with the scales of the species described by Aiton appear not to have been identified from the wild in N. Amer.; but later he has proposed the hypothesis of the hybrid origin and this seems to go far toward clearing up the difficulties of this perplexing group. The tree is still recognized as cult, in England and France, where ,it was known as early as 1750. In general, the longer-than-broad lvs. which are merely acute or short-acuminate rather than long-acuminate, and with deeply cordate or truncate base, distinguish this form. It is a loose open grower, with nothing of the strict narrow shape of the common Carolina poplar of the streets, which is probably P. Eugenei. It is hardy in N. Y. How extensively P. angulata occurs as a planted tree in N. Amer, should be made a subject of inquiry.
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