Portal de Periódicos da CAPES

Plants of Coahuila, Eastern Chihuahua, and Adjoining Zacatecas and Durango, IV

1944; Arnold Arboretum of Harvard University; Volume: 25; Issue: 4 Linguagem: Inglês

10.5962/p.185505

2474-3283

Ivan M Johnston,

Rangeland and Wildlife Management

A widely distributed somewhat variable species ranging from northern Mexico northward to Canada.The material from Coahuila falls into var.Lindheimerii Schneider and that from Chihuahua approaches and is perhaps referable to var.vallicola Dudley (==5.Gooddingii Ball), a western phase of the species, which differs from var.Lindheimerii in having usually pubescent, rather than glabrous, fruit and pedicels and lighter, usually yellowish, twigs and branchlets.Schneider, Bot.Gaz.65: 11 (1918), cites collections of var.Lindheimerii from Piedras Negras (Trelease 133) and from San Bernardo near the Chihuahua-Durango boundary {Gregg 479), and collections of var.vallicola from Juarez {Stearns) and Santa Eulalia Mts., {Wilkinson).On the Texan bank of the Rio Grande forms of the species, perhaps best referred to var.vallicola, have been collected from El Paso down to the Big Bend.The plant is the large arborescent willow most common in our area.Usually associated with Populus, it is present along streams and rivers and elsewhere about perennial sources of water.