93. Ericaceae 1 75 



1. Flowers pale yellow or cream; stem puberulent at the nodes; leaves 



1- to 3-ternate; woods near streams, local. May-June 



T. barbinode (Michx.) Nutt. 



21. Anethum L. — Dill 

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

 July-Sept. 



22. Polytaenia DC. — Prairie Parsley 

 P. nuttallii DC. Dry soil, locally throughout 111. May-June. 



23. Angelica L. — Angelica 



l.Stem pubescent; fniit roundish, pubescent, 4 mm broad; oil- 

 tubes several, distinct; dry soil in southern Illinois. July. [A. 

 villosa (Walt.) BSP., non Lag.] A. venenosa (Greenw.) Fern. 



1. Stem glabrous; fruit ellipsoid, 6 mm long, glabrous; oil-tubes con- 

 tinuous; river banks, locally in the n. half of the state. June 

 A. atro purpurea L. 



24. Pastinaca L. — Parsnip 



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

 from Eur. June-Aug. 



25. Heracleum L. — Cow Parsnip 



H. lanatum Michx. Wet ground, locally in the n. two-thirds of the 

 state. June-Aug. [H. maximum Bartr., nom. illciiit.]. 



26. Conioselinum HofTm. — Hemlock Parsley 

 C. chinense (L.) BSP. Wet ground, rare; Cook and Kane coun- 

 ties. Aug.-Sept. [C. canadense (Michx.) T. & G.]. 



27. OxypoHs Raf. — Cowbane 

 O. rigidior (L.) Raf. Swamps, locally throughout 111. Aug.- Sept. 



93. Ericaceae DC. — Heath Family 

 1. Ovary superior. 



2. Plants saprophytic, without chlorophyll, white, pink, or tawny, often 



turning blackish in dr>'ing 3. Monotropa 



2. Plants with ordinary green foliage. 

 3. Corolla polypetalous. 



4. Leaves alternate or somewhat whorled: filaments dilated 



1. Chimaphila 



4. Leaves all basal; filaments subulate 2. Pyrola 



3. Corolla sympetalous. 



5. Leaves entire. 



6. Erect shrubs; fruit a capsule. 



