322 LlLlACEAE Trillium 



Ovary very dark purple; filaments about half as long as the anthers, about 



3.5-4 mm long. (See excluded species no. 142, p. 1035.) T. erectum. 



Ovary white or nearly so; filaments two thirds as long as the anthers or 

 longer; anthers pinkish or purplish, 2.5-6.5 mm long. 

 Petals 5-9 mm wide; mature anthers 2.5-4.5 mm long. (See excluded 



species no. 141, p. 1035.) T. cernuvm. 



Petals 10-17 mm wide; mature anthei-s 4-6.5 mm long 



5. T. cernuum var. macranthum. 



Filaments very short, about a third as long as the anthers or less. 



Petals white; filaments yellowish white; ovary white or nearly so 



6. T. Gleasoni. 



Petals purplish or maroon; filaments yellowish white, purplish or maroon; 

 ovary white or partly purplish or maroon, rarely entirely reddish brown. 

 7. T. Gleasoni f . Walpolei. 



1. Trillium sessile L. Sessile-flower Trillium. Map 659. Infrequent 

 to frequent throughout the greater part of the state, but becoming rare to 

 absent in the southwestern counties. It is found mostly in rich, moist 

 woods. 



I have had plants with 4 and 5 leaves and one with greenish yellow 

 petals under cultivation and they have come true for at least 10 years. 

 I also have plants with 2 and 3 stems from the same rootstock. In one 

 instance one stem has 3 leaves and the other has 4 leaves. 



Pa. to Minn., southw. to Va., Tenn., Ark., and La. (Brown). 



la. Trillium sessile f. luteum (Muhl.) Peattie. (Jour. Elisha Mitchell 

 Soc. 42: 197. 1927.) This is a form with greenish yellow petals which I 

 have found in Adams, Allen, and Wells Counties. Beyer (Torreya 27: 83. 

 1927) names this form f. viridiflorum, but since Peattie's treatment ante- 

 dates Beyer's by four months, Peattie's name is used here. 



2. Trillium recurvatum Beck. Reflexed-sepal Trillium. Map 660. 

 Infrequent throughout the state. All of my specimens are from woodland 

 of different kinds although I recall seeing the species along the railroad 

 south of Battle Ground, Tippecanoe County. 



Ohio, Mich, to Minn., southw. to w. Tenn. and Ark. 



2a. Trillium recurvatum f. luteum Clute. (Amer. Bot. 28: 79. 1922.) 

 Reported from Monroe County by Friesner, and there are specimens in the 

 herbarium of Butler University from Lawrence and Montgomery Counties. 

 There is a specimen from Johnson County in the herbarium of Franklin 

 College. 



3. Trillium nivale Riddell. Snow Trillium. Map 661. In rocky or 

 gravelly soil in protected places on steep, wooded slopes, usually along or 

 near streams. It is local to very local and probably closely restricted to the 

 area indicated on the map after the reports from Clark, Decatur, and 

 Marion Counties are added. On account of its very early appearance it 

 may not have been collected in many places where its occurs, and it may 

 be more widespread than the reports indicate. Authors do not mention that 

 the stem in cross section is hexagonal with the angles more or less winged 

 and minutely roughened. 



Western Pa. to Minn., southw. to Ky. and Iowa. 



