216 TREES AND SHRUBS. 



March 23 and April 15, 1894 ; Sabina Canon, Santa Catalina Mountains, Santa Cruz County, 

 J. W. Tourney, October 7, 1894. California: Fort Yuma, San Diego County, C. S. Sargent, 

 October 1, 1880. Mexico : Nuevo Leon, near Saltillo, E. Palmer, April, 1898 ; Monterey, C. S. 

 Sargent, March 19, 1900. 



There is certainly no good morphological character by which this tree can be distinguished from Salix nigra 

 Marshall. The scales of the aments are usually acute, or even acuminate at the apex of the inflorescence, while at the 

 base they are often rounded as in Salix nigra. In Salix nigra, however, acute scales sometimes occur at the apex oi^ 

 the inflorescence, showing that little reliance can be placed on the shape of the scales, which are rather more densely 

 covered with hairs than those of some forms of Salix nigra. The hairs at the base of the filaments of Salix Wrightii 

 are longer and more numerous than those of Salix nigra. The real difference, however, between the two trees is in 

 the color of the young branches, and in the color and character of the bark of old trees. These are so distinct that it 

 seems desirable to consider this yellow-twigged Willow a species rather than a variety of Salix nigra. The two grow 

 together on the Red River north of Denison, Texas, and often in northern Texas, but from the San Antonio region 

 westward to California Salix Wrightii appears to replace entirely the dark-twigged dark-barked Salix nigra. 



The short pistillate ament of the specimen collected by Charles Wright in New Mexico (No. 1877, in Herb. Gray) 

 on which Andersson founded the species is perhaps abnormal, although shorter pistillate aments sometimes occur on other 

 specimens from New Mexico and Arizona than are usually found on the Texas tree. 1 



i NOTES ON SALIX. 

 One of the forms of Salix nigra which is common in southern Arkansas and Louisiana may be distinguished as — 

 Var. altissima, n. var. 



Leaves lanceolate, acuminate and long-pointed at the apex, gradually or abruptly narrowed and cuneate at the base, slightly 

 falcate, finely serrate, slightly villose above when they unfold, and at maturity glabrous with the exception of the hairs on the 

 lg and from 2 to 2.2 centimetres wide ; petioles slender, hoary-tomentose, 

 , from 6 to 7.5 centimetres long, their scales rounded or toward the apex 

 of the ament acute or acuminate, thickly coated with hoary tomentum. Flowers and fruit as in the species. 



3 high, with a trunk from 1 to 1.5 metres in diameter, covered with rough deeply furrowed reddish 

 brown bark, and slender tomentose branchlets, becoming reddish brown and glabrous by the end of their first season. Flowers 

 early in April. Fruit ripens in May. 



Arkansas : Fulton, Hempstead County, B. F. Bush, May 20, 1909 (No. 5654), October 4, 1909 (No. 5929), J. H. Kellogg, June 

 20, 1910. Louisiana : Shreveport, Cado Parish, R. S. Cocks, April, 1910 (No. 115), Clear Lake, Richland Parish, March 30, 1910 

 (No. 107), between Rayville and Lucknow, Richland Parish, May 30, 1910 (No. 113); Carenco, La Fayette Parish, C. S. Sargent, 

 April 1, 1885; banks of Red River at Alexandria, Rapids Parish, R. S. Cocks and C. S. Sargent, April 4, 1913; Lake Charles, 

 Calcasieu Parish, C. S. Sargent, April 3, 1913; Bayou Sara, West Feliciana Parish, R. S. Cocks, March 29 and April 28, 1910 (No. 

 Ill), Laurel Hill, West Feliciana Parish, March 30, 1910, swamps, Harvey's Canal, New Orleans, Orleans Parish, April 10, 



p both north and south 

 r. Tb 

 e of the typical plant, but these also are char- 

 acters which cannot be relied upon. The habit of the trees of the variety, the great size and height which individuals attain 

 under favorable conditions, and the fact that they flower from two to three weeks later than the typical trees, make it desirable 

 to distinguish it as a variety. No other American Willow, and perhaps no Willow in any part of the world, grows to the height 

 of this tree on the rich bottom-lands of the Red River in Arkansas, or forms a straight trunk free of branches for a distance of 

 from fifty or sixty feet from the ground. At Lake Charles, Louisiana, the typical Salix nigra and this variety grow together, and 

 913, the variety was just beginning to flower, many of the staminate aments at the ends of the branches being not 

 i of the typical glabrous trees had entirely disappeared and their fruit was 



l variety which was described by Andersson as S. marginata (Svensk. Vetensk. Akad. Handl. ser. 4, 

 vi ; i iMonographia Sahcum] [1867]) based on a specimen in the herbarium at Vienna collected by Drummond at New Orleans 

 Infi A T ^ Seen " AnderSSOn describea the ca P su1 ^ as « conicis-obtusis, basi sericeo-pubescentibus, ceterum glabris," but I 

 can find ** Lomsiana specimens with capsules at all inclined to be obtusish or with any pubescence at their base. The specimen 

 (No. 303) and preserved in the Gray Herbarium appears to be intermediate 

 only slightly pubescent and the scales of the aments are less tomentose 



Salix occidentals, Bosc. 



prttt vu'^T Us ° f ° uU must * added t0 the silva of the United states > as * occurs in Dade Count y in the extreme southern 



Little River, C. S. Sargent, February 22, 1911; Miami River, April 18, 1886; Paradise Key in the Everglades, E. A. Bessey, 



