198 American Midland Naturalist Monograph No. 2 



19. Anethum L. — Dill 



A. graveolens L. Waste ground, escaped from cult.; native of Eur. July- 

 Sept. 



20. Polytaenia DC. 



{Pleiolaenia C. & R.) 

 P. nuttallii DC. Prairie Parsley. Dry soil, locally throughout III. May-June. 



21. Angelica L. — Angelica 



l.Stem pubescent; fruit roundish, pubescent, 4 mm. broad; oil-tubes several, 



distinct; dry soil, s. 111. July. [A. villosa (Walt.) BSP., not Lag.] 



A. venenosa (Greenw.) Fern. 



l.Stem glabrous; fruit ellipsoid, 6 mm. long, glabrous; oil-tubes continuous; 

 river banks, local. June A. atropiirpiirea L. 



22. Pastinaca L. — Parsnip 



P. sativa L. Roadsides, fields, and waste places, very common; nat. from 

 Eur. June-Aug. 



23. HeracleUiM L. — Cow-parsnip 



H. latiatum Michx. Wet ground, local, throughout the n. two-thirds of 

 the state. June-Aug. 



24. Conioselinum Fisch. — Hemlock-parsley 

 C. chinense (L.) BSP. Wet ground, rare. Aug. -Sept. 



25. OxYPOLls Raf. 

 O. rigidior (L.) Raf. Swamps, local. Aug. -Sept. 



120. Ericaceae DC. — Heath Family 



1 . Ovary superior. 



2. Plants saprophytic, without chlorophyll, white, pink, or tawny, turning black in 



drying 3. Monotropa 



2. Plants with ordinary green foliage. 

 3. Corolla polypetalous. 



4. Leaves alternate or somewhat whorled; filaments dilated 1. Clumaphila 



4. Leaves all basal ; filaments subulate 2. Pxirola 



3. Corolla sympetalous. 



5. Leaves entire. 



6. Erect shrubs; fruit a capsule. 



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. JEpigaea 

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



9. Arcioslaphxilos 



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. Caallhcria 



