176 American Midland Naturalist Monograph No. 7 



7. Leaves short-petioled, deciduous, not revolute-margined ; flowers 



large, showy, somewhat irregular; anthers awnless 



4. Rhododendron 



7. Leaves sessile or nearly so, revolute-margined, evergreen, pale 



beneath; flowers small, white, nodding; anthers awned 



5. Andromeda 



6. Trailing shrubs; leaves petioled. 



8. Blades cordate at the base; corolla salverform; fruit a capsule 



7. Epigaea 



8. Blades cuneate at the base; corolla urceolate; fruit a drupe 



9. Arctostaphylos 



5. Leaves denticulate or serrate. 



9. Leaves resinous-dotted beneath; flowers in terminal leafy-bracted 



racemes; fruit a capsule 6. Chamaedaphne 



9. Leaves not resinous-dotted; flowers axillary; berries red 



8. Gaultheria 



1. Ovary inferior; fruit a berry; shrubs. 



10. Corolla sympetalous, urceolate or ovoid; erect shrubs; fruit black or 

 bluish. 



11. Leaves resinous-dotted; ovary 10-loruled; drupe with 10 nutlets 



10. Gaylussacia 



1 1 . Leaves not resinous-dotted ; ovary 4- to 5-loculed ; fruit a many- 

 seeded berry 11. Vaccinium 



10. Corolla deeply 4-cleft, the lobes reflexed ; flowers nodding on slender 

 pedicels; trailing shrubs with small evergreen leaves; berries red, acid 

 12. Oxy coccus 



1 . Chimaphila Pursh — Pipsissewa 

 C. corymbosa Ptirsh. Dry woods, rare. Lake, McHenry, and Win- 

 nebago counties. June-Aug. [C. umbellata of auth., not Pyrola 

 umbellata L. ; C. umbellata var. cisatlantica Blake]. C. maculata (L.) 

 Pursh, with lanceolate, whitish-\ariegated leaves, has been erroneously 

 attributed to 111. 



2. Pyrola L. — Wintergreen 

 1. Style ciuved downward. 



2. Sepals lanceolate, 2.5-3 mm long, much longer than broad; 

 leaf-blades suborbicular, glossy, about as long as the petioles; 



shaded mossy sandstone slope near Oregon, Ogle Co 



P. americana Sweet 



2. Sepals ovate, acute, 2 mm long, about as broad as long; leaf- 

 blades oval, dull, longer than the petioles; woods, northern 



111., rare. June-Aug. Shinleaf P. elliptica Nutt. 



1. Style straight; raceme 1 -sided; leaves oval; woods, rare; Cook Co., 



Babcock: Winnebago Co., E. W. Fell in 1946. June-Aug 



P. secunda L. 



3. Monotropa L. 



1. Flower solitary; plants glabrous, waxy-white or pink (drying 

 black) ; style shorter than the ovary, glabrous; rich woods, rare 

 or local throughout 111. June-Sept. Indian Pipe M. uniflora L. 



