116 AMERICAN MIDLAND NATURALIST. 
as synonyms P. alba majoribus foliis, Bauh. Pin. 429, P. alba Dod. 
Pemp. 835. P. alba latifolia Lob. Ic. 2. p. 193, etc. Under P. 
canescens wid. p. Pl. 4: 802, 1805) he cites the second species 
of Bauhin, P. alba folio minore. 
From the above it is clear that the Populus alba of pre-Linnean 
and later authors is identical with Z. nivea Willd.—possibly the 
handsomest of poplars. The illustration in Flora Danica (t. 2182) 
does not show the very characteristic leaves of the upper branches 
and the rootshoots 
According to Carl Hartman (Anteck. Linn. Herb. 423) there 
appears to be one specimen of P. alba in the Linnean Herbarium. 
That this specimen represents the historic species we may conclude 
since Hartman cites P. nivea Willd., as a synonym of P. alba L. 
(See Skadin. Fl. ed. 10. 187, 1870.) The synonymy of Populus 
alba so far as we have been able to ascertain is: 
Populus alba Matth. Comm. Diosc. 136, 1565, Dodon, Stirp. 
ist. 823, f., 1583; Camer. Epit. 65, 1586; Tabern, 
eoe an 72. 1591; Jonst. Dendr. 437. t. 123. f., 1662; 
L. . Clif. 460, 1737; Sp. Pl. 1034, 1753; Willd. Sp. 
na n P 1805. Reichenb. Icones Fl. Ger. 11: 29. t. 
614. 
Populus e "latifolia Lob. Icon. 2: 193, 1581. 
Populus alba majoribus foliis C. Bauh. Pin. 429, 1623. 
Populus alba a Haller, Stirp. Helv. 156, 1742. 
Populus alba incana Weinm. Iconogr. 136. t. 826. La 120 
Populus major Mill. Gard. Dict. ed. 8. 1768. 
Maret alba Eee Ait. Hort. Kew. 3: 405. 1789. 
Wes D. C. Prodr. 16: 324. 1868. 
indie wl nivea prie Berl. Baumz. 227, 1796. 
Description: ‘‘ Rami horizontales. Fol. subrotundo-ovata, angu- 
lato-dentata, ramulorum terminalium multo maiora, cordata, palmato- 
5-7-loba, dentata, omnia sicut ramuli petiolique albissima. Amenta 
ovata, squamae apice fissae, ciliatar." Schmitz € Regel. Fl. Bonn. 
150, 1841. 
This handsome tree is readily recognized by its os 
branches, its light gray bark and angular leaves. While in P. 
canescens the bark has a greenish-gray tinge. In P. a/ba dois is 
scarcely a trace of yellow or green. When allowed to spread the 
lower branches are horizontal and the tree is broader than high. 
The leaves of the rootshoots and the uppermost branches are 
