330 Karl M. Wiegand and Arthur J. Eames 



3. Subfamily Ericoideae 



a. Corolla in outline funnel-form or saucer-shaped; fruit a septicidal capsule. 

 b. Corolla polypetalous ; flowers white, from scaly buds ; leaves woolly beneath. 



6. Ledum 



b. Corolla gamopetalous ; flowers usually pink or purple; leaves not woolly. 

 c. Corolla without staminal pockets; flowers from scaly buds. 



7. Rhododendron 

 c. Corolla with staminal pockets ; flowers not from scaly buds. 



8. Kalmia 

 a. Corolla urceolate or salver-form; fruit a loculicidal capsule or a berry. 



b. Corolla urceolate; anthers with terminal pores. 

 c. Plant erect, 30-180 cm. high ; fruit capsular. 



d. Sepals imbricated ; anthers not awned on the back ; flowers in f oliaceous- 



bracted, terminal racemes; leaves evergreen. 9. Chamaedaphne 



d. Sepals valvate ; flowers in closer clusters ; bracts not f oliaceous. 



e. Anthers awned on the back; leaves evergreen. 10. Andromeda 



e. Anthers naked on the back; leaves deciduous. 11. Lyonia 



c. Plant erect, 3-1 S cm. high; leaves evergreen; fruit a false berry (see also 



3d c). 12. Gaultheria 



c. Plant prostrate; leaves evergreen; fruit a berry. 13. Arctostaphylos 

 b. Corolla salver- form ; anthers opening vertically ; plant prostrate ; leaves oval, 



evergreen. 14. Epigaea 

 4. Subfamily Vaccinioideae 



a. Ovary half inferior; anther cells not prolonged into tubes; trailing plants. 



15. Chiogenes 



a. Ovary wholly inferior; each anther cell prolonged into a tube; erect or trailing 

 plants. 

 b. Ovary 4-5-celled, many-seeded ; foliage not resinous-dotted. 



16. Vaccinium 

 b. Ovary 10-celled, 10-seeded; foliage resinous-dotted. 17. Gaylussacia 



1. Monotropa L. 



a. Flowers solitary; style very short and broad. 1. M. uniflora 



a. Flowers racemose ; style longer than the ovary. 2. M. Hypopitys 



1. M. uniflora L. Indian Pipe. Corpse Plant. 



Saprophytic on humus under various species of trees, in dry or moist woodlands, 

 on calcareous or noncalcareous gravels ; fairly common. July- Aug. 



Generally distributed throughout the basin, except perhaps in the clays and allu- 

 viums and in the richer soils back from the shores of Cayuga Lake. 



Newf. to B. C, southw. to Fla. and Mex., including the Atlantic Coastal Plain. 

 Found also in e. Asia. 



2. M. Hypopitys L. (Including M. lanuginosa Michx.) Pine-sap. 

 Saprophytic on slightly acid humus in dry woods, mainly of oak and chestnut, 



on noncalcareous gravels ; occasional. July-Aug. 



Mainly w., s., and e. of Ithaca, along the shores of Cayuga Lake, and on the 

 sands n. of the lake ; rare or absent in the McLean region and on the clays and 

 richer soils back from both sides of the lake. 



Que. to B. C, southw. to Fla., La., and Mex. ; less frequent on the Atlantic 

 Coastal Plain. Found also in Eurasia. 



All the material is apparently the hairy extreme, M. lanuginosa Michx. M. 

 uniflora and M. Hypopitys are often separated as two distinct genera, the generic 

 differences being in styles, anthers, and some other parts. The perianth and the 



