24 
Spring Flora of Oklahoma 
pistil. Fruit a leathery, 1-seeded nut (acorn), partly en¬ 
closed in an accrescent, scaly involucre (cup). 
1. Leaves or their lobes bristly-tipped, deciduous; acorns 
maturing in autumn of second year. 
A. Leaves pinnatifid or pinnately lobed. 
Leaves green on both sides. 
Cup of the acorn saucer-shaped, much broader than 
high. 
Cup 8"-12" broad; acorns ovoid; leaves dull. 
1. Q. rubra. 
Cup 4"-8" broad; leaves shining. 
Acorn sub-globose or short-ovoid; northern. 
2. Q. palustris. 
Acorns ovoid; southern. 3. Q. Schneckii. 
Cup of the acorn turbinate or hemispheric. 
Inner bark gray to reddish; leaves deeply lobed. 
4. Q. coccinea. 
Inner bark orange; leaves pubescent in the 
axils of the veins beneath. 5. Q. velutina. 
Leaves white or gray-tomentose beneath. 
6. Q. triloba. 
B. Leaves 3-5-lobed above the middle or entire, obovate 
* or spatulate in outline. 
Leaves obovate-cuneate, brown-floccose beneath. 
7. Q. marilandica. 
Leaves spatulate to obovate, glabrous both sides. 
8. Q. nigra. 
C. Leaves entire, oblong, lanceolate or linear-oblong. 
Leaves linear-oblong, green and glabrous on both sides. 
9. Q. Phellos. 
Leaves oblong or lanceolate, brown-tomentulose be¬ 
neath. 10. Q. inbricaria. 
2. Leaves or their lobes not bristle-tipped, deciduous; 
acorns maturing in autumn of first year. 
