× _Populus Jackii_ Sarg., believed to be a hybrid of the northern Cottonwood with _P. tacamahacca_, with characters intermediate between those of its supposed parents, grows spontaneously near the mouth of the Chateaugay River and at Beauharnois, Province of Quebec, and at South Haven, Michigan, and is now occasionally cultivated. 15. Populus Palmeri Sarg. [Illustration: Fig. 132] Leaves thin, ovate, gradually or abruptly contracted at apex into a narrow acuminate entire point, cuneate or rounded at the broad base, finely serrate with incurved teeth, ciliate on the margins when they unfold, otherwise glabrous, 2½′—5′ long and 1½′—2¼′ wide; petioles slender, glabrous, 1½′—2½′ in length. Flowers not seen. Fruit: aments glabrous, 12—15 cm. long; fruit ovoid, obtuse, slightly pitted, puberulous, thin-walled, 4-valved, ¼′—⅓′ long, the disk deeply lobed; pedicel slender, ¼′—⅓′ in length. A tree 60° tall, with a straight trunk 3° in diameter, erect smooth pale branches forming an open pyramidal head, the lower branches smaller, horizontal or pendulous, and slender glabrous branchlets light reddish brown early in the season, becoming pale grayish brown in their second year. Bark pale, 3′—4′ thick, deeply divided by wide fissures into narrow ridges. Distribution. In moist fertile soil near springs, at the base of high chalky bluffs of Nueces Cañon of the upper Nueces River, Uvalde County, growing with _Salix nigra_ var. _Lindheimeri_, _Carya pecan_, _Morus rubra_ and _Ulmus crassifolia_, and at Strawn, Palo Pinto County, Texas. 2. SALIX L. Willow.