80 
IOWA ACADEMY OF SCIENCE Voi<. XXVII, 1920 
elongating to six inches or more; in color reddish to purplish 
green. Cotyledons elliptical, shining, smooth above and below, 
short petioled, margins incurved. First leaves lanceolate, smooth 
above, and below, green, nearly opposite. Root long, straight, 
with a number of lateral roots. Roots all dark-colored. 
GentianaIvEs 
Oleaceae 
Fraxinus americana L. White ash. 
Seeds collected on campus, Iowa State College, 1918; strati- 
fied out of doors ; planted in greenhouse, March 8, 1919. Germi- 
nation percentage low. 
Germination epigaeous. Hypocotyl smooth, purplish. Cotyle- 
dons linear-lanceolate, elongated, lower surface slightly hairy. 
Epicotyl smooth, purplish, green. First pair of leaves simple, 
ovate-lanceolate, pale green, somewhat glaucous below, pubescent 
on midrib, darker green above, margins with hairs, dentate; 
slightly petioled, buds in axils of each leaf. Stalk between first 
and second pair of leaves yellowish, resinous. Second pair of 
leaves petioled, pubescent on margin when they unfold. Third 
leaves just as they push out, yellowish, granular. 
Department oe Botany 
Iowa State College 
