62 JOURNAL OF THE ARNOLD ARBORETUM [vol. t 



furrowed on old trunks. Leaves 8-11 cm. long and 6-7 cm. wide, their 

 petioles up to 7 cm. in length. Fruit 3-5 mm. long in crowded aments 



6-7 cm. in length. 



Distribution. River banks, Silver City, Grant County, New INIexico, 

 A, Rchdcr, August 10, 1014 (No. 275); Alice EaMirood, April and May, 

 1919 (Nos. 8175, 8176, 8178, 8179, 8201, 829G, 8345, 8347, 8348, 835G. 8357, 

 8358, 8379, 8383 [lype], 8384, 8393, 8423, 8424, 8433, 8453, 8455, 8456, 

 8479. River banks near Fort Whipple (Nos. 8831 and 8841) and Fres- 

 cott (Nos. 8853 and 8854), Yavapai County, Arizona, Alice Eastwood, 

 May, 1919. 



Populus Fremontii var. macrodisca, n. var. 



A typo recedit disco latu et alto capsulam fere includente, 

 A tree with glabrous branchlets, rcdcHsh brown when they first appear, 

 becoming liglit yellow-brown in their first winter. Leaves broad-ovate, 

 abruptly long-pointed and acuminate at apex, subcordate at the broad 

 base, and gradually narrowed and cuncate to the insertion of the petiole, 

 coarsely crenately serrate, glabrous, 7-9 cm. long and broad; petioles 

 slender, 5-8 cm. in length. Fruit in aments 1(K12 cm. long, ellipsoidal, 

 rounded at the ends, 7-8 mm. long, enclosed to above the middle or nearly 

 to the apex in the broad cup-like disk slightly undulate on the margins; 

 pedicels 2-3 mm. long. 



DisTRiiu Tiox. Near Silver City, Grant County, New Mexico, Alice 

 Ea.stirooil .May, 1919 (Nos. 8429 [type], 8435). 



In the peculiar shape of the base of its leaves this variety resembles 

 FopnhLS Frcmoniii var. Toiwieyi Sargent which has been colleeted by Miss 

 Eastwood in the neighl^orhood of Silver City, but the leaves are larger. 

 The size of the disk under the fruit distinguishes this tree from all other 

 American Fophirs. 



Populus balsamif era Linnaeus, Spec. 1034 (1753). — P. angulata Michaux 

 f., Hist. Arb. Am. iii. 302, t. 12 (1813). — P. angulata var. vih^sourieiisis A. 

 Henry in Elwes & Henry, Trees of Great Britain, vii. 1811 (1913). — P. 

 deUi)idta var. missoaricyusis \. Henn' in Card. Chron. ser. 3, lvi. 40 (1914). 



The fact has long been known to students of American trees that the 

 Populus halsamijcra of Linnaeus was one of the Cottonwoods and not the 

 Balsam Poplar of northeastern North America for which Linnaeus's name 

 has long been used, but it is only recently that tlie correct applieution of 

 the name has been suggested in print. ^ Linnaeus ])ased his sj)(K'ies on the 

 Pcpidus nigra, folio maximoy gcmmis halsamum odor atis simum ju.nd cut ihus 

 of Catesby {Hist. Nat. Car, t. 34, t. 34). Catesby\s specimen from which 

 his figure was made is preserved in the British IMuseum and through the 

 courtesy of Dr. Bendle the Arboretum possesses an excellent })hotograph 

 of this specimen which must 1)e taken as the type of P! hah-aniifera Linnaeus. 

 It does not represent the common Cottonwood of the eastern states but a 

 tree which, although widely distributed, is now rare and local. The leaves 



J Fanvell in Rhodora, xxi. 101 (1919). 



