Jones: Flora of Illinois, 31. Liliaceae 95 



18. Medeola L. 



M. virginiana L. Indian Cucumber-root. Wooded ravines, rare. Evanston, 

 Cook Co., L. N. Johnson in 1889. 



19. Trillium L. 



1. Flowers sessile; petals purple. 



2. Leaves sessile; sepals not reflexed; moist woods, local. Apr.-May 



T. sessile L. 



2. Leaves short-petioled; sepals reflexed; woods, common. Apr.-May. Purple 



Trillium T. recurvatum Beck 



1. Flowers peduncled; petals white (or purple). 



3. Leaves sessile or essentially so; fruit 6- angled, winged. 



4. Petals 4-6 cm. long, obovate or oblanceolate; peduncle erect or ascend- 

 ing; woods, e. and n.e. 111., rare. Apr.-May 



T. grandiflorum (Michx.) Salisb. 



4. Petals 2-4 cm. long, oval; peduncle usually horizontal or declined, rare- 

 ly erect; woods, common. Apr.-May. [T. declinatum (Gray) Gleas- 

 on, non Raf.] Occasional purple-flowered plants are sometimes mis- 

 taken for the eastern T. erectum L T. gleasoni Fern. 



3. Leaves short-petioled; petals white, 1.5-3 cm. long; peduncle erect; fruit 3- 

 lobed, not winged; wooded slopes, local; known from Stark, Peoria, 

 Sangamon, Piatt, and Champaign counties. Mar. -Apr. Snow Trillium 

 T. nivale Riddell 



20. Smilax L. 



{Nemexia Raf.) 



1. Stems woody, usually more or less prickly, at least on the lower part; ovules 

 solitary in each locule of the ovary. 

 2. Leaves glaucous on the lower surface, ovate; umbels 6- 12 -flowered; open 

 woods and sandy soil, s. 111. May-June. Sawbrier S. glauca Walt. 



2. Leaves green on both surfaces. 



3. Leaves more or less contracted near the middle or 3-lobed, commonly 

 deltoid-hastate, often spinulose on the margins and veins beneath; 

 umbels 15-45-flowered; fruit mostly 1 -seeded; thickets, s. 111. May- 

 June. Fringed Greenbrier S. bona-nox L. 



3. Leaves ovate, cordate, or roundish. 



4. Leaves thin; branchlets terete; prickles black, terete (upper branches 

 often without prickles); peduncles longer than the petioles; fruit 

 black, not glaucous, usually 1 -seeded; woods and thickets, com- 

 mon. May-June. Common Greenbrier S. hisp:da Muhl. 



4. Leaves firm; branchlets angular; prickles flattened, green; peduncles 

 shorter than the petioles; fruit glaucous, 2- or 3-seeded; dry woods, 

 s. 111. May-June S. rotundifolia L. 



1. Plants herbaceous, not bristly or prickly; ovules two in each locule. 



5. Leaves puberulent and green beneath; stem climbing; fruit black; wooded 

 slopes, s. 111. May S. pulverulenta Michx. 



