168 American Midland Naturalist Monograph No. 7 



1. Calyx-lobes lanceolate, caudate-acuminate, much longer than the 

 tube, erect or spreading at flowering time; wooded hillsides, 

 local; extending southward to Knox, Tazewell, and Coles coun- 

 ties. May-June A. acuminatum (Ashe) Bickn. 



2. Aristolochia L. — Birthwort 

 1. Low herb; flowers purple, 1-1.5 cm long, solitary on slender basal 

 scaly peduncles; calyx-tube curved like the letter S; capsule sub- 

 globose, ridged, about 1 cm in diameter. 

 2. Leaves ovate-lanceolate, cordate; rich woods: locally northward 



to La Salle Co. Virginia Snakeroot A. scrpentaria L. 



2. Leaves narrowly sagittate or hastate; swamps, rare; Pulaski Co., 



H. E. Allies in 1952 A. nashii Kearney 



1 . Twining shrub ; flowers on axillary solitai-y pubescent bractless 

 peduncles; calyx tomentose, the tube abruptly bent, yellowish- 

 green, about 3 cm long, dark purple within; leaves suborbicular 

 or broadly ovate, tomentose; capsule ellipsoid, 4-6 cm long; rich 

 woods, rare; extending northward to Wabash and Macoupin 

 counties. May-June. Dutchman's Pipe A. tomcritosa Sims 



88. Santalaceae R.Br. — Sandalwood Family 



1. Comandra Nutt. — False Toadflax 

 C. umbellata (L.) Nutt. Sandy soil or grassy roadsides, locally 

 nearly throughout 111. May-June. [C. richardsiana Fern.]. 



89. Loranthaceae D.Don — Mistletoe Family 



1. Phoradendron Nutt. — American Mistletoe 

 P. flavescens (Pursh) Nutt. Parasitic on American elm, black gum, 

 oak, and other deciduoiis trees in s. 111., extending northward to Ran- 

 dolph, Saline, and Crawtord coimties. 



90. Cornaceae Link — Dogwood Family 

 {Nyssaceae Endl. ; Alangiaceae Lindl.) 



1. Flowers 4-merous, perfect; leaves opposite (except Cornus alternifolia) 



1. Cornus 



1. Flowers 5-merous, polygamous; leaves alternate 2. Nyssa 



1. Cornus L. — Dogwood 

 {Chamaepericlymenum Hill: Cynoxylon Raf. : Svida Opix ex Small) 

 1. Flowers cymose or paniculate, without an inxolucre; truit white or 

 blue. 

 2. Leaves chiefly alternate and clustered toward the ends ol the 

 branchlets; pith white; fruit bluish black, glaucous; woods, 

 usually near streams, chiefly in the northern two-thirds of the 



state. May-June. Alternate-leaved Dogwood 



C. alternifolia L.f. 



