iqiq] SARGENT— north AMERICAN TREES 237 



Sunflower County), and in southwestern Indiana (in a cypress swamp 18 miles 

 west of Decker, Knox County, C. C. Deam.) 



In the broad 3-5-lobed leaves cordate at base this maple is very distinct 

 from other forms of A. rubrum, but trees occasionally occur with 3-lobed leaves 

 rounded at base. This form may be described as 



Acer rubrum var. Drummondii f. rotundata, n. f. — Differing 

 from the variety in the 3-lobed leaves rounded at base. 



Specimens of this form have been collected in Louisiana at Chopin, Natchi- 

 toches Parish, E. J. Palmer, May 6, 1915 (no. 7553 type), and at Glen Gordon, 

 Covington, St. Tammany Parish, R. S. Cocks, March 28, 1911; in Texas near 

 Beaumont, Jefferson County, C. S. Sargent, April 11, 191 5; and in Missouri 

 at Poplar Bluff, Butler County, G. W. LeUerman, September 3, 1882. 



The fruit of this form has not been collected, but the tomentum of the 

 leaves, petioles, and branchlets is that of the var. Drummondii. The shape 

 of the leaves shows a transition into 



Acer rubrum var. tridens Wood. — A. harhatum Michaux, 

 Fl. Bor. Am. 1:252 (at least insomuch as related to the leaves). 

 1803; Elliott, Sk. 1:451 (at least in part). 1821. — A. carolinianiim 

 Britton in Britton and Shafer, N. Am.' Trees 648 (not Walter). 

 1 8 13. — The leaves of this maple are obovate, narrowed from above 

 the middle to the rounded or rarely cuneate base, 3-lobed at apex, 

 coarsely serrate usually only above the middle, often ovate or 

 oblong-ovate by the suppression of the lateral lobes, green or 

 glaucous and glabrous, pubescent or tomentose on the lower 

 surface. The flowers and fruit are red or yellow. 



It has been found from ^lassachusetts to Florida, ^lissouri, and in eastern 

 Texas to Harden and Cherokee counties, but is most abundant southward and 

 sometimes, as in Richland Parish, northern Louisiana, it is the prevailing form. 



The extreme forms of this variety are distinct, but the 3-lobed leaves often 

 occur on trees with leaves of the normal form of the red maple, and the leaves 

 on vigorous shoots of trees of this variety are often 5-lobed. 



Walter's specimen of his A. carolinianum is preserved in the British 

 Museum and is a typical .4. rubrum, not the variety tridens. The leaves of 

 A. barbatum as described by Michaux and Elliott seem to be those of A. 

 rubrum var. tridens. Their "peduncuH solito pilosi" might apply to A. florida- 

 num filipes Rehder. 



Acer Negundo L. — The box elder or ash-leaved maple, which 

 is one of the most widely distributed trees in the United States, has 



