1918] SARGENT—QUERCUS 429 
what must be considered the type of the species, as LINNAEUS 
based his description on Gronovtius’ “Quercus foliis cuneiformibus 
obsolete trilobis’’ and on Carespy’s figure (Nat. Hist. Car. 1: 
pl. 20), the leaves are oblong-obovate, gradually narrowed and 
cuneate at base and enlarged often abruptly at the broad rounded 
entire or occasionally obscurely 3-lobed apex. On trees with such 
leaves, and especially on vigorous young branchlets, the leaves are 
sometimes pinnatifid with acute, acuminate, or rounded lobes, or are 
deeply 3-lobed at apex, or are broadly oblong-obovate and rounded 
at apex with entire or undulate margins. Occasionally on upper 
branches a linear-lanceolate leaf similar in shape to those of seed- 
ling plants can be found. The leaves of the seedlings differ more 
from the leaves of older trees than in any other of our oaks, and 
are linear-lanceolate with entire or undulate margins, or are occa- 
sionally lobed with one or two pointed lobes, and are often deeply 
3-lobed at the broad apex with acuminate rounded lobes; such 
leaves are occasionally furnished below the middle with a single 
acuminate lobe, leaves of all these forms often occurring on one 
plant less than 1 m. tall. On occasional mature trees all the leaves 
are trilobed at the apex, and such leaves appear so different from 
the common form of the water oak that this form may be distin- 
guished as 
‘ QUERCUS NIGRA var. tridentifera, n. var.—Differing from the 
type in the oblong-obovate leaves, gradually narrowed below into 
an elongated cuneate base and gradually widened above into a 
more or less deeply 3-lobed apex, the lobes rounded or acute. 
Lovurstana.—Near Laurel Hill, West Feliciana Parish, Cocks and Sargent, 
April 13, 1916 (type); Loranger, Tangipahoa Parish, Cocks and Sargent, 
March 30, 1917; Audubon Park, New Orleans, R. S. Cocks, October 8, 1913, 
C. S. Sargent, March 31, 1917. 
Mississippi.—Liberty Road, near Natchez, Adams County, Miss C. C. 
Compton, April 19, 1915; near Jackson, Hinds County, T. G. Harbison (no. 82), 
May 20, 1915. 
ALABAMA.—Roadsides near Selma, Dallas County, C. S. Sargent, April 19, 
peerage —Navidad River, Lavaca County, low woods, Z. J. Palmer (no. 
9237), March 20, 1916 (no. 9086, with some leaves acute and laterally lobed), 
March 6, 1916 
