96 MISSOURI BOTANICAL GARDEN. 



becomes black, retaining this color for many 



g 



on old 



trees. The characteristic foliage and twig characters are 



wv, c*..v. v.„-. & 



sometimes replaced by those more nearly agreeing with the 

 type of the species, from which, on the whole, 1 think the 

 variety separable. Of these intermediate forms are the 

 following: — Canada, (Niagara Falls, Schrenk, Aug. 1888; 

 Belleville, Macoun, 1866, 984 ; Pelee Point, Macoun, June 

 30, 1882, 985), New York (hb. Gray; Kelsea's, Schrenk, 

 1883), New Jersey (Sparta, Britton, Sept. 11, 1890), 

 Pennsylvania (Bethlehem, Lochman, June 1891), Ten- 

 nessee (Carter Co., Small and Heller, July 16, 1891), 

 Illinois (Jonesboro, Wolfe, 1872; opposite St. Louis, 

 Engelmann and Eggert, various collections; about Mt. 

 Carmel, Schneck, numerous specimens, many of them with 

 5-lobed leaves with the middle lobe dilated upwards, but 

 coriaceous, and with thick mostly blunt buds), and Mis- 

 souri (Allenton, Letterman, various collections; O'Fallon, 



Trelease). 



Acer saccharum var. nigrum (Michaux, f.) Britton, 



Trans. N. Y. Acad. 1889, ix. 9 ; Sudworth, Kept. Secy. 

 Agric. 1892, 325. — A. nigrum Michx. f., Hist. Arb. 

 Amer. ii. 1810, 238, pi. 16, and Sylva, various editions, 

 pi. 43; Gray, Amer. Nat. vi. 767, vii. 422; Bailey, 

 Popular Gardening, Nov. 1887, 24, with figure, and 

 Bot. Gazette, xiii. 214; Eaton, Manual, ed. 2, 122, ed. 

 4, 186, ed. 5, 90, ed. 6, 2, ed. 7, 140; Eat. & Wright, 

 Bot. 112; Pursh, Fl. i. 266; Torrey, Compend. 170; 



Beck, Bot. 63; Hooker, Fl. Bor.-Amer. i. 113; Wood, 

 Class Book, editions of 1851, 1854 and two styles of 

 41st ed., 213, editions of 1861, 1865, 1867 and 1868, 

 286, and Fl. Atl. 74. — A. saccharinum var. nigrum 

 Gray, Manual, ed. 1, 80, and ed. 6,117; Browne, Trees, 

 84, with figure; Torrey, Fl. N. Y. i. 137; Torrey & 



Gray, Fl. i. 248. — A. barbatum var. nign 

 Garden & Forest, iv. 148, f. 27 (stipules) 

 ii. 99 in part. — A. saccharinum var. glc 



Pax, 



9 



