200 American Midland Naturalist Monograph No. 2 



6. Chamaedaphne Moench — Leatherleaf 

 C. calyculata (L.) Moench. Swamps and bogs, Lake Co. May. 



7. Epigaea L. — Trailing Arbutus 

 E. repens L. Woods, rare. "Illinois," without definite locality, Vasey. 



8. Gaultheria L. — Creeping Wintergreen 

 G. procumbens L. Checkerberry. Woods, rare. June-Aug. Cook Co.: Glen- 

 coe, Aug. 8, 1873, P. Blatchford; Elk Grove, Aug. 4, 1943, G. Pear sail. 



9. Arctostaphylos Adans. — Bearberry 



A. uva-ursi (L.) Spreng. Kinnikinnick. Woods and dunes, local; known 

 from Lake, Cook, Ogle, and Peoria counties. May-June. 



10. Gaylussacia HBK. 



G. baccaia (Wang.) K. Koch. Black Huckleberry. Rocky woods and hill- 

 sides, chiefly in n. 111. May-June. 



11. Vaccinium L. 



(Cyianococcus Rydb.) 

 1. Shrubs mostly 2-10 m. tall. 



2. Leaves glossy above, coriaceous, the margins narrowly revolute, usually 

 bearing a few small glands; anthers 2-awned; berries black, inedible; 

 open woods, s. 111. May-June. Farkleberry. [^Batodendroii arboretim 

 (Marsh.) Nutt.] V. arboreiim Marsh. 



2. Leaves not glossy, entire or ciliolate-serrulate, acute; anthers awnless; 



berries glaucous; swamps and bogs, n.e. 111. May-June. Highbush Blue- 

 berry V . corymbosiim L. 



l.Low shrubs usually less than 1 m. tall. 



3. Twigs densely pubescent; leaves entire, lanceolate, pubescent; shrubs 20- 



60 cm. tall; moist ground, rare, n. 111. May-June. Canada Blueberry 



V . canadense Richards. 



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

 mostly serrulate with bristle-tipped teeth. 



4. Leaves lanceolate or elliptical, sometimes glaucous beneath; shrubs 20- 

 40 cm. tall; sandy soil or in open woods, Kankakee, La Salle, and 

 Cook counties. May-June. \V . pennsylvanicum sensu Lam., non 



Mill.; V. nigrum (Wood) Britt.] Low-bush Blueberry 



V. angustifolium Ait. 



4. Leaves oval; shrubs up to 1.5 m. tall; sandy soil in open woods, locally 



throughout 111., except the n. counties. May-June. Hill Blueberry 



V. vacdlans Kalm 



12. OxYCOCCUS Hill Cranberry 



1. Leaves ovate-lanceolate, or elliptic-lanceolate (broadest near the base), 

 acute or acutish; pedicels mostly terminal, the bracts attached near the 

 middle; fruit 6-9 mm. in diameter, globose, usually spotted; bogs, n. 111., 



