Spring Flora of Oklahoma 
25 
A. Leaves pinnatifid or pinnately lobed. 
Mature leaves pale, or glaucous and glabrate beneath; 
cup shallow. 11. Q. alba. 
Mature leaves tomentulose beneath; cup one-third to 
fully as long as the acorn. 
Upper scales of the cup not awned. 
Leaves yellowish-brown-tomentulose beneath; 
acorn ovoid. 12. Q. stellata. 
Leaves white-tomentulose beneath; acorn de¬ 
pressed-globose. 13. Q. lyrata. 
Upper scales awned, forming a fringe around the 
acorn. 14. Q. macrocarpa. 
B. Leaves crenate or dentate, not lobed. 
Fruit peduncled. 
Peduncle much longer than petioles; leaves white- 
tomentulose beneath. 15. Q. bicolor. 
Peduncle equaling or shorter than the petioles; 
leaves gray-tomentulose beneath. 
Teeth of the leaves acute or mucronulate. 
16. Q. Michauxii. 
Teeth of the leaves rounded. 17. Q. Prinus. 
Fruit sessile or nearly so. 
Tall tree; leaves oblong, obovate or lanceolate. 
18. Q. Muhlenbergii. 
Shrub or low tree; leaves oval or obovate. 
19. Q. prinoides. 
3. Leaves entire (rarely with a few bristle-tipped lobes), 
evergreen. 20. Q. virginiana. 
1. Quercus rubra L. Red Oak. A large tree. Leaves oval or 
obovate, green above, pale and sightly downy beneath. Sinuses shal¬ 
low and rounded, lobes 8-12, taper-pointed. Petioles long. Cups 
saucer-shaped, with fine scales. Acorn ovate or oblong, about 1 
long. 
Found in both rich and poor soil. Eastern part of the stat?. 
May-June. 
