284 American Midland Naturalist Monograph No. 7 



2. Stem slender, 30-50 cm tall, 2-4 mm thick at base; inedian and 

 lower leaves when mature usually 6-10 cm long, 1.5-3 cm 

 wide; berries paired or solitary, 7-9 mm in diameter; seeds 

 2.5-3.5 mm long; plants presumably diploid (n = 10) ; 

 woods, s. 111., not common. May. [P. canaliculatum (Muhl.) 

 Pursh] P. biflorum (Walt.) Ell. 



2. Stem stout, becoming 60-120 cm tall and 1-1.5 cm thick toward 

 the base; median and lower leaves 10-15 cm long, 5-8 cm 

 wide; berries 5-8 on the lower peduncles, each 10-14 mm in 

 diameter when fresh; seeds 9-11, subglobose, 4-5 mm in diam- 

 eter; plants presimiably tetraploid (n = 20) ; rich soil in 

 woods throughout 111. May-June. [P. giganteurn Dietr. ; P. 

 canaliculatum sensu Fern., probably not Convallaria canali- 

 culata Muhl.] P. coinmutatuni (Schultes) Dietr. 



21. Convallaria L. — Lily-of-the-valley 



C. majalis L. Persisting near old dwellings; when planted in 

 cemeteries often forming large patches from which the mature fruits 

 are scattered by birds. Native of Eur. 



22. Yucca L. — Common Yucca 



Y. filamcritosa L. Cemeteries, roadsides, old gardens; frequently 

 cultivated, and often persisting, or occasionally escaped; native of 

 southeastern U.S. June. 



23. Medeola L. — Indian Cucumber- root 



M. virginiana L. Wooded ravines, rare; Evanston, Cook Co., L. 

 N. Johnson in 1889; Ottawa, La Salle Co., G. D. Fuller in 1939. 



24. Trillium L. — Trillium 



I. Flowers sessile; petals purple or green. 



2. Leaves definitely petioled, the petioles 1-2.5 cm long; sepals 

 reflexed, acuminate, 1.5-3 cm long; rhizoine slender, hori- 

 zontal; woods, common throughout 111. Apr. -May. Pinple 

 Trillium. Wake Robin. Yellow-flowered plants with purple 

 stamens (f. luteum Clute) or yellow stamens (f. sliayi 



Palmer & Steyerin.) are found occasionally 



- - T. recurvatum Beck 



2. Leaves sessile; sepals not reflexed; rhizome short, stout. 



3. Petals purple; sepals 2-3 cm long; stem smooth; moist 

 woods, locally nearly throughout III., but not common. 



Apr. -May. Sessile Trillium T . sessile L. 



3. Petals greenish; sepals 4-6 cm long; stem often minutely 

 hirtellous at summit; woods, rare; Jackson, Macoupin, 

 Pike, and Union counties. Apr. -May. Green Trillium 



T . viride Beck 



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



