12 BOTANICAL GAZETTE [JANUARY 
minute yellowish glands upon the inner surface, which are absent in the typical 
black willow and var. altissima. The fruits of var. Lindheimerii are somewhat 
larger (6-7 mm. long) than those of the typical form (4-5 mm.). On the other 
hand, the Mexican specimens are often very similar to those of S. Humboldtiana, 
var. stipulacea; from this var. Lindheimerii seems to be best distinguished by 
its looser fruiting catkins, its more elongated fruits with longer and thinner 
pedicels, its leaves being more distinctly attenuated at the base, and by its 
comparatively longer petioles. 
e are the following specimens from western Mexico which may repre- 
sent a distinct form of var. Lindheimerii or a new variety of S. nigra. Froma 
geographical point of view one might expect those plants to be a form of S. 
Gooddingii, but the color of the older branchlets, although being not quite so 
reddish brown as in var. Lindheimerii, is much more like it than S. Gooddingii. 
I do not dare to propose a new variety, but I want to draw the attention of 
collectors to it in the hope that they may be able to procure good flowering 
material, ripe fruits, and mature leaves. 
Mexico: State of Sinaloa, vicinity of Guadalupe, April 18, 1910, J. N. Rose, 
P.C. Standley, and P. G. Russell (no. 14780, st.; W.; folia lineari-lanceolata iis 
var. Lindheimerii simillima, ad 13 cm. longa et 9 mm. lata, basi valde acuta, 
petiolis gracilibus fere ad 1 cm. longis); vicinity of Villa Union, moist field, 
April 2, 1910, same coll. (no. 13955, m., N., W.; folia ut in praecedente, amenta 
parva, vix 2.5:0.6 cm. magna; bracteae versus apicem amenti acuminatae, 
basim versus obtusiores; pedunculi vix 1 cm. longi, folia plura linearia ad 3 cm. 
longa gerentes); vicinity of Culiacan, April 21, 1910, same coll. (no. 14893, 
f., st.; N., W.; folia maxima ad 13:1.4 cm. magna, petiolis ad 15 mm. longis; 
hares ut in var. Lindheimerii; fructus immaturi circ. 5 mm. longi pedicello ‘ 
duplo breviore).—Terr. Tepic, Santiago, February 1895, F. H. Lamb (no. 581, 
Pe ., N.; a var. Lindheimerii praecipue differt bracteis florum juvenilium 
acuminatis et pubescentia distinctiore ramulorum novellorum; amenta valde 
laxiflora, ad 8 cm. longa, fructibus nondum maturis); vicinity of Acaponeta, 
April 11, 1910, Rose, Standley, and Russell (no. 14362, st.; N., W.; ramuli 
hornotini flavescentes, ceterum ut in var. Lindheimerii). 
3. S. Gooppincrt Ball in Bor. Gaz. 40:376, pl. 12, figs. 1,2. 1905. 
—S. nigra Bebb in Watson, Bot. Calif. 2:83. 1879, non Marsh.; 
Jepson, Fl. Cal. 2:339. 1909; Parish, Cat. Pl. Salton Sink 3. 1913 
(reprinted from “The Salton Sink,” Publ. no. 93,‘Carnegie Inst. 
Wash.); Wooton and Standley in Contrib. U.S. Nat. Herb. 19:161 
(Fl. N.Mex.). 1915; S. nigra, var. vallicola Dudley apud Abrams, 
Fl. Los Angeles 100. 1904; Suppl. Ed. 100. 1911; S. vallicola 
Britt., N.Am. Trees 184. fig. 141. 1908; S. Wrightit Woot. and 
Standl. in Contrib. |. c. 160. 1915, non And. 
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