130. LiLIACEAE 285 



4. Leaves sessile or essentially so; fniit 6-anfjled, 6-winged. 

 5. Petals 4-6 cm long, obo\ate or oblanteolate, white, turning 

 pink with age; stigmas straight or nearly so; peduncle 

 3-10 cm long, erect or ascending; woods, locally in the 



northern half of 111. Apr.-May. I^arge Trillium 



- T. grandiflorum (Michx.) Salisb. 



5. Petals 2-4 cm long, oval; stigmas recurved or coiled. 



6. Peduncle 4-6 cm long, usually horizontal or declined; 

 petals usually white (purple in f. walpolci (Fai-w.) 

 Deam) ; filaments about one-third as long as the 

 anthers; woods, locally nearly throughout III. Apr.- 

 May T. gleasoni Fern. 



6. Peduncle 1-3 cm long, deflexed; filaments two-thirds as 

 long as the anthers; woods, rare; Ringwood, McHenry 

 Co., Vasey; Wolf Lake, Chicago, Cook Co., E. J. Hill 

 in 1891 T. ceniuum L. 



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



erect; fruit 3-lobed, not winged; wooded slopes, locally in 

 the northern half of 111., extending southward to Jersey, 

 Sangamon, and Coles counties. Mar.-Apr. Snow Trillium 

 - T. nivalc Riddell 



25. Smilax L. 



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- to 12- 

 flowered; open woods and sandy soil in s. III. 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- to 45-fIowered; fruit 

 mostly 1-seeded; thickets in s. 111. May- June. Fringed 



Greenbrier S. bona-nox L. 



3. Leaves ovate, cordate, or roundish. 



4. Branchlets terete or nearly so; prickles black, terete (up- 

 per branches often without prickles) ; peduncles longer 

 than the petioles; fruit black, not glaucous, usually 

 1-seeded; woods and thickets, conmion throughout 111. 



May-June. Common Greenbrier S. hispida Muhl. 



4. Branchlets angular; prickles flattened, green; peduncles 

 shorter than the petioles; fruit glaucous, 2- or 3-scedcd; 



dry woods in s. 111. May-June S. rotuudifolia L. 



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

 locule. 



5. Leaves puberulent and green and glossy beneath : stem climb- 



ing; fruit black; wooded slopes in the s. half of 111. May 



, S. pulverulenta Michx. 



