SILVA OF NORTH AMERICA. 
SAPINDACEAE. 
Acer Saccharum, var. leucoderme has been planted, with other forms of the Sugar Maple, along 
the streets of Rome, Georgia, where there are now many large and handsome specimens of this tree. 
Floridanum, Sargent ; and Acer barbatum, var. grandidentatum, Sar- 
gent, becomes Acer Saccharum, var. grandidentatum, Sargent. 
In the second volume of this work « form of the Sugar Maple 
with somewhat coriaceous leaves of firm texture, usually rather 
broader than long, pale or glaucous and pubescent or rarely gla- 
brous below, cordate, with 4 broad open sinus, or truncate at the 
base, and usually three-lobed with open round sinuses and acumi- 
nate generally nearly entire lobes, was confounded with the Black 
Sugar Maple, and figures 1-3 of plate xci. of this work represent 
this form and not the Black Maple. The synonymy of this form is 
as follows : — 
Acer Saccharum, var. Rugelii, Rehder, Cyclopedia Am. Hort. i. 
13 (1900). 
Acer saccharinum, Schmidt, Oestr. Baumz. i. 12, t. 8 (not Lin- 
neus nor Wangenheim) (1792). — Elliott, Sk. i. 450. 
? Acer nigrum, Elliott, 2. c. (not Michaux f.) (1817). 
Acer saccharinum, var. glaucum, Pax, Engler Bot. Jahrb. vii. 242 
(in part) (1886). 
Acer Rugelii, Pax, l. c. 243 (1886). — Schwerin, Gartenflora, 
xlii. 457. 
Acer palmifolium, var. nigrum, Schwerin, l. c. 456, £. 95, No. 4 
(1893). 
Acer saccharinum, subspec. saccharinum, var. glaucum, Wes- 
mael, Bull. Soc. Bot. Belg. xxix. 61 (in part) (Gen. Acer) (1890). 
Acer saccharinum, subspec. Rugelii, Wesmael, J. c. (1890). 
Acer saccharinum, var. nigrum, Newhall, Trees of N. E. Am. 
152 (in part), f. 76 (1890). 
Acer barbatum, var. nigrum, Sargent, Silva N. Am. i. 99 (in 
part), t. 91, f. 1-3 (1891). 
Acer Saccharum, var. barbatum, Trelease, Rep. Missouri Bot. 
Gard. v. 94, t. 6 (not Acer barbatum, Michaux) (1894). — Robin- 
son, Gray Syn. Fl. N. Am. i. pt. i. 439. — Chapman, Fi. ed. 3, 87. 
This is the common and frequently the only form of the Sugar 
Maple in the region from North Carolina and Georgia to Missouri, 
and although rare at the north, trees with leaves like those of the 
southern tree occur as far north as Michigan and Prince Edward’s 
Island, and, as Professor Beal has pointed out, such leaves some- 
times appear on the upper branches of trees which bear on their 
lower branches the typical leaves of the northern Sugar Maple. 
(See Rep. Sec. State Board Agric. Michigan, xxxiii. 148 [The Sugar 
Maple of Central Michigan].) 
On the one hand, therefore, Acer Saccharum, var. Rugelii, passes 
into the northern Acer Saccharum, and on the other some of its 
forms seem to pass into the variety Floridanum, which replaces it 
from northern Florida to eastern Texas, and which in its turn 
passes through western Texas into the variety grandidentatum of the 
Rocky Mountain region. 
Acer Saccharum, var. Rugelii, is the form which is usually culti- 
vated in the southern states, and splendid specimens growing in 
the streets and gardens of Huntsville, Alabama, and other cities 
and towns of the southern Piedmont region show that this is one 
of the most beautiful of all Maple-trees, particularly in autumn, 
when the leaves assume the most brilliant tints of scarlet and 
orange. 
EXPLANATION OF THE PLATE. 
Puate DCXXIV. Acer SaccHAaRUM, var. LEUCODERME. 
1. A flowering branch, natural size. 
WOAD AP ww 
. A fruit, natural size. 
. A staminate flower, enlarged. 
- Vertical section of a staminate flower, enlarged. 
. A pistillate flower, enlarged. 
- Vertical section of a pistillate flower, enlarged. 
A fruiting branch, natural size. 
. Cross section of a seed, enlarged. 
- An embryo, enlarged. 
