TRANS. ST. LOUIS ACAD. SCIENCE. 



PiNUS Elliottii, Engelm. n. sp. 



A large tree, 50-100, rarely to 1 10 feet high, 2-4 feet in cliame- 

 ter, with (7-15 lines thick) laminated, reddish-brown bark ; leaver 

 in twos and threes, in the axils of lanceolate, long-fringed, some- 

 what persistent bracts, 7 to 12 (mostly about 9) inches long, f to 

 nearly i line wide, rigid, closely serrulate, acutish ; sheaths at first 

 about I 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 (ij 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, 

 retuse. Cones peduncled, recurved, oval to cylindrico-conical, 

 3 to 6 J, usually 4 to 5 inches long, if to 2\ inches in diameter 

 (when closed), of a rich brown color and alniost glossy ; bracts 

 thickened, retuse, or emarginate ; scales in if 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, 2^ 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. Tceda, 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 ; 



