166 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
Acorns of medium size; only the younger 
leaves conspicuously toothed. 
Leaves large, obovate, strongly reticu- 
late; teeth small and numerous... .13. 
Leaves of medium size, oblong, only 
slightly reticulate, entire or with 
few coarse teeth. 
Leaves and twigs of the year glabrous 
teeth. ..........02 22 ee eee eee 10. 
Leaves permanently and densely 
stellate-pubescent beneath, as 
also the twigs of the year; leaves 
various. 
Cup shallow; acorn acute.........12. 
Cup deep, covering one-third the 
acorn; acorn truncate or obtuse.11. 
Leaves chlorophyll green, not coriaceous, deciduous in the 
fall, hence the plants leafless in the winter. 
Leaves coarsely serrate-toothed with numerous teeth 
from base to apex, not truly lobed............... 14, 
Leaves more or less sinuately lobed. 
Low shrubs, never forming trees; leaves small, 7 cm. 
long or less. 
Lobes few and shallow, appearing as a few large 
teeth; some of the leaves obovate in 
outline.....2....0. eee eee eee eee ee 15. 
Lobes deep and more numerous; leaves oblong 
in outline. 
Acorns very large, 25 mm. long; a plant of 
the southeastern sandhills........... 16. 
Acorns small, 10 mm. long or less, racemose; 
plant of the mountains of the northern 
part of the State.........2........... 17, 
Taller shrubs or trees with large, deeply lobed leaves 
mostly 10 cm. long or more. 
Mature leaves soft-pubescent and almost velvety 
beneath. 
Scales of the cup thin, little thickened on 
the back; leaves distinctly obovate 
in outline........0.00.........00... 18, 
Scales of the cup thickened on the back; 
leaves mostly oblong, only slightly 
broadened upward.................. 19. 
Mature leaves not velvety beneath, usually 
glabrate, sometimes slightly pubescent, 
especially on the veins. 
Cup saucer-shaped, covering less than one- 
fourth of the acorn.................. 20. 
Cup hemispheric, covering one-third to half 
the acorn. 
Acorns ovoid, acute; cup covering 
about half the acorn............... 24, 
. reticulata. 
. oblongifolia. 
. arizonica, 
. grisea. 
. muhlenbergii. 
. havardii, 
. venustula, 
. submollis. 
. utahensis. 
. vreelandit. 
. gambelii. 
