1921] SCHNEIDER, NOTES OxN AMERICAN WILLOWS, XII. 85 



The species of the Longifoliae, too, are widely spread from Guatemala 

 (S. taxifolia microphylla) to the vicinity of Dawson in the Yukon Valley, 

 Yukon Territory (S. longifolia pedicellata) , and in the States from coast 

 to coast. 



The Bonplandianae inhabit a more restricted area from Guatemala 

 (S. Bonplandianae forma) to northern California (S. laevigata) or even 

 southern Oregon in the west, and Illinois to the District Columbia (S. 

 (longipes Wardii) in the east. 



Other sections indigenous to Central and North America and apparently 

 of no distinct relationship to forms of the Old Word are: Mexicanae 

 (three species) in Mexico; Wolffianae (one species) in Idaho, Wyoming, 

 Montana, Oregon and Colorado. 



The Candidae with S. Candida (and possibly S. cryptodonta) are also 

 a section the true affinity of which is by no means clear. It is a Willow 

 of the northern United States from New Jersey to Montana, and of 

 Canada from Labrador to Alberta and probably to British Columbia and 

 the Great Slave Lake in the Northwest Territories. 



The Fulvae, too, with S. Bebbiana, Geyeriana and Lemmonii are a dis- 

 tinctly American group of which S. Bebbiana is a widely spread member 

 from New Mexico to the Yukon Territory, and from Newfoundland and 

 New Jersey to northeastern Nevada and Washington. 



Very limited is the range of the strange Brewerianae (California), and 

 of the Sitchenses (Pacific coast from California to Southern Alaska). 



Other sections, like the Cordatae, Adenophyllae, Balsamiferae, Disco- 

 lores and Griseae, including only American forms, nevertheless show a 



more or less distinct affinity to Asiatic and European species, while the 

 sections Reticulatae, Ovalifoliae, Glaucae, Phylicifoliae, Chrysantheae 

 and Roseae combine species of the Old and New World. 



On the following pages I give an alphabetic enumeration of the species 

 met w r ith in the different states of the United States and of Canada as 

 well as in Mexico and South America. Those species indigenous to or 

 hitherto known only from one state or district are marked with an asterisk. 

 A question-mark signifies that the occurrence of the species or form in 

 the region is still doubtful or that it is not yet clearly identified. 



UNITED STATES 



Alabama: S. nigra, longipes var. Wardii. 



Alaska: S. alaxensis and var. longistylis, * amplifolia, arbusculoides, 

 arctica and var. obcordata, Barclayi and var. hebecarpa, Bebbiana var. 

 prostrata, * Chamissonis, commutata, Farrae var. Walpolei, fuscescens, 



glacialis, glauca var. acutifolia, * lingulata, myrtillifolia, niphoclada, 

 ovalifolia and vars. * canadensis and * subarctica, phlebophylla, * polaris 

 (typica?) pulchra and var. yukonensis, reticulata, * rotundifolia and f. * 

 pilosiuscula, Richardsonii, Scouleriana, sitchensis, * stolonifera and f. 



subpilosa, * venusta (doubtful). 



