144, 
ACERACEAE 
Acer 
1. Leaves pinnately compound; young branches bright 
green; samaras forming a sharp, inverted V............ A. negundo 
1. Leaves simple, palmately lobed; young branches not green; 
samaras forming a broad, inverted U or divergent. 
2. Leaves 7-lobed, broader than long; sap milky; 
samaras widely divergent; leaves green beneath..... A. platanoides 
2. Leaves (3-) 5-lobed, usually longer than broad; 
sap clear; samaras forming an inverted U or moderately 
divergent; leaves white beneath. 
3. Lobes extending more than halfway to midrib, 
sides of terminal and sometimes lateral 
lobes divergent; buds, flowers, petioles, 
young branches, and samaras yellowish-green..... A. saccharinum 
3. Lobes usually extending less than halfway to 
midrib, sides of all lobes converging; buds, 
flowers, petioles, young branches, and samaras 
(especially young) reddish to bright red........ A. rubrum 
Acer negundo L. Boxelder 
Java Farm and Ivy Neck. Infrequent in old fields and at margins 
of forest. Higman 427, 577, 620. 
A. platanoides L. Norway Maple 
Java Farm. One station: single seedling on trail along north 
boundary from old entrance gate to Muddy Creek. Hectare 2471. 
Canopy of Quercus alba, Liriodendron tulipifera, Acer rubrum, Fagus 
grandifolia, Carya tomentosa, etc. Higman 1078. 
A. saccharinum L. Silver Maple 
Ivy Neck. One station: several large trees along marshy border of 
pasture (source of Cheston Creek). Hectare 4733. Grazing cows have 
prevented understory development and have deposited considerable manure. 
Canopy of Robinia pseudoacacia, Diospyros virginiana. Higman 1071. 
A. rubrum L. Red Maple 
Java Farm and Ivy Neck. Aggressive invader of abandoned fields, often 
co-dominant with Liquidambar styraciflua. Infrequent to moderately abundant 
in almost all forested areas, especially moister ones. Higman 417, 556. 
