178 American Midland Naturalist Monograph No. 7 



3. Twigs densely pubescent; leaves entire, elliptical, softly pubes- 

 cent; shrubs 20-60 cm tall; moist ground, rare, in Lake, 

 La Salle, Ogle, and Winnebago counties. May-June. Can- 

 ada Blueberry [V. canadense Kalm] V. myrtilloides Michx. 



3. Twigs glabrous, or more or less puberulent in lines, rugulose; 



leaves mostly serrulate with bristle-tipped teeth, glabrous or 



finely pubescent. 



4. Leaves narrowly elliptical, 7-13 mm wide, bright green on 



both sides; shrubs 5-35 cm tall; sandy soil or in open 



woods, northern 111. May-June. Low-bush Blueberry [V . 



pensylvanicum Lam., non Mill.; V. nigrum (Wood) Britt.] 



V. angustijoliurn Ait. 



4. Leaves oval, 1-3 cm wide, paler beneath or glaucous; shrubs 

 30-90 cm tall; chiefly in the southern counties, but also in 

 Cook, Kankakee, Lee, Peoria, and Menard counties. May- 

 June. Hill Blueberiy V. vacillans Torr. 



12. Oxycoccus Hill — Cranberry 

 O. macrocarpus (Ait.) Pursh. Bogs; known from Cook, McHenry, 

 and Will counties. June-Aug. [Vaccinium macrocarpon Ait.]. 



94. Ebenaceae Vent. — Ebony Family 



1. Diospyros L. — Persimmon 

 D. virginiana L. Woods, chiefly in the southern part of the state, 

 but extending northw. to Peoria Co. May-June. 



95. Styracaceae A. DC. — Storax Family 



1. Ovary superior; fruit subglobose, drupaceous 1. Styrax 



1. Ovary inferior; fruit nut-like, elongate, winged 2. Halesia 



1. Styrax L. — Storax 

 S. americana Lam. Swamps and banks of streams, rare, s. 111., 

 extending northward to Lawrence Co. Apr. -May. 



2. Halesia Ellis — Silverbell Tree 



H. Carolina L. Woods, and along streams, rare; Massac Co. Apr.- 

 May. 



96. Sapotaceae Dumort. — Sapodilla Family 



1. Bumelia Sw. 



1. Leaves, pedicels, and calyces glabrous or nearly so; clusters many- 

 flowered; moist thickets and bluffs in southern 111. June-Aug. 

 Southern Buckthorn B. lycioides (L.) Pers. 



1. Leaves (beneath), pedicels, and calyces tomentose; clusters 6- to 

 12-flowered; woods and bluffs, southern 111., rare. Jime-July. 

 Woolly Buckthorn B. lanuginosa (Michx.) Pers. 



