26 TRANS. ST. LOUIS ACAD. SCIENCE. [186 
Pinus Exuiorti, Engelm. n. sp. 
A large tree, 50-100, rarely to 110 feet high, 2-4 feet in diame- 
ter, with (7-15 lines thick) laminated, reddish-brown bark ; leaves 
in twos and threes, in the axils of lanceolate, long-fringed, some- 
what persistent bracts, 7 to 12 (mostly about 9) inches long, ¢ to 
nearly 1 line wide, rigid, closely serrulate, acutish ; sheaths at first 
about 3 inch long, later withering to one-half that length; resin 
ducts internal (adjacent to the sheath of the vascular bundles). 
Male flowers from the axils of similar, persistent bracts, cylindri- 
cal, elongated (13 to 2 inches long), in a short head (not more 
than t inch long), each one surrounded by an involucre, 4 lines 
in length, of about 12 bracts, the exterior pair strongly keeled, 
half the length of the inner ones; anthers with semicircular, denti- 
culate, rose-purple crests; pollen grains 0.037 to 0.045, on an 
average 0.04 lines in the longer diameter. Female aments pe- 
duncled, mostly 2 to 4, or rarely to 6 together, oval, purplish, at 
first erect, but soon assuming a horizontal and (a month later, 
and before the leaves are well developed) a recurved position, the 
_axis meanwhile elongating and in vigorous trees not rarely form- 
ing a second tier of aments several inches above the first ones ; 
the bracts above the aments bear the usual leaf-bundles, so that 
no naked space is left; carpellary scales broad, rounded, more or 
less abruptly cuspidate, their bracts half their length, transverse, 
retusé. Cones peduncled, recurved, oval to cylindrico-conical, 
3 to 63, usually 4 to 5 inches long, 17 to 24 inches in diameter 
(when closed), of a rich brown color and almost. glossy ; bracts 
thickened, retuse, or emarginate; scales in 33 order, the 5 and 
8 spirals most conspicuous; larger scales 2 inches long and 7 
lines wide; apophyses marked with grooves, radiating from the 
slightly prominent umbo, transversely divided by a sharp ridge, 
armed with a short stout or rarely a slender sharp prickle. Seeds 
triangular, 24 to 3} lines long, dark, slightly ridged, and rough 
on the under side ; wing 4 or 5 times as long (13 to 16 lines long), 
_ somewhat oblique, obtuse, with nearly parallel sides, or usually 
somewhat broader below, its base covering the greater part of 
the outer or upper surface of the seed; cotyledons 6 to 9, usually 
8.—P. Teda, var. heterophylla, Elliott, Sketch 2, p. 636. . 
Common, in light sandy damp soil, among the sandhills near 
the seabeach and along the marshes near the mouths of rivers; 
