28 
Spring Flora of Oklahoma 
Cup depressed-globose, its bracts broad, thin, cuspidate. Acorn de¬ 
pressed-globose, high, nearly or quite immersed in the cup. 
In swamps or along streams. April-May. 
14. Quercus macrocarpa Michx. Mossy-cup or Bur Oak. 
Leaves obovate or oblong-obovate in outline, rather thin, irregularly 
lobed, pinnatifid, or some coarsely crenate. Cup hemispheric or sub- 
globose, 8"-2' in diameter, its bracts floccose, thick, hard, ovate or 
forming a fringe around the acorn. Acorn ovoid, 1-2 times as high 
as the cup. 
In rich soil. May-June. 
15. Quercus bicolor Willd. Swamp white oak. Leaves obo¬ 
vate, or oblong-obovate, coarsely toothed or sometimes lobed nearly 
to the middle, narrowed or rounded at the base, firm. Cup hemis¬ 
pheric, its bracts pubescent, lanceolate, appressed, the lower obtuse, 
the upper acute or acuminate. Acorn oblong-ovoid. 
In moist or swampy soil. May-June. 
16. Quercus Michauxii Nutt. Basket Oak. Leaves obovate or 
broadly oblong, apex acute or acuminate, base narrowed, rounded or 
sub-cordate, sharply toothed, the teeth acute or mucronulate. Cup 
depressed-hemispheric, its bracts thick, ovate or lanceolate, appressed, 
acorns ovoid, about 3 times as high as the cup. 
In moist soil. April-May. 
17. Quercus Prinus L. Rock Chestnut Oak. Leaves coarsely 
crenate, oblong, oblong-lanceolate or obovate. Cup hemispheric, its 
bracts tomentose, triangular-ovate, acute or cuspidate, appressed. 
Acorn ovoid, 2-3 times as high as the cup. 
In dry soil. May-June. 
18. Quercus Muhlenbergii Engelm. Chestnut or Yellow Oak. 
Leaves oblong, lanceolate or obovate, apex acuminate or acute, base 
narrowed or rounded, coarsely toothed. Cup hemispheric, its bracts 
floccose, ovate, acute or cuspidate, appressed. Acorn ovoid, about 
twice as high as the cup. 
In dry soil. May-June. 
19. Quercus prinoides Willd. Scrub ro Dwarf Chestnut Oak. 
A shrub, 2°-15° tall, sometimes tree-like. Leaves obovate, coarsely 
toothed, mostly acute or short-acuminate at the apex, narrowed at 
the base, the teeth short, triangular, sub-acute or obtuse. Cup hemi¬ 
spheric, thin, its bracts floccose, triangular-ovate or oblong-lance¬ 
olate, appressed. Acorn ovoid, obtuse, 2-3 times as long as the cup. 
In dry sandy or rocky soil. April-May. 
20. Quercus virginiana Mill. Live Oak. Leaves evergreen, 
coriaceous, oblong, elliptic or oblanceolate, apex obtuse, base nar¬ 
rowed or rounded, entire, or, with a few bristle-tipped teeth. Cup 
turbinated, its bracts closely appressed, ovate or lanceolate. Acorn 
ovoid-oblong. 
In dry soil. March-April. 
