188 American Midland Naturalist Monograph No. 2 



18. Plants decidedly pubescent; basal leaves usually absent at flower- 



ing time; seeds 2.6-3 mm. long; moist woods, rare. Apr. -May. 



Downy Yellow Violet V. pubescetis Ait. 



17. Petals violet or white. 



19. Stipules entire, scarious; petals violet or white; woods, rare. Apr.- 



June. Canada Violet V. canadensis L. 



19. Stipules dentate or fimbriate. 



20. Petals creamy white; sepals ciliolate; upper leaves acute; stip- 

 ules 1.5-2.5 cm. long; alluvial soil, common. Apr.-June. 



Cream Violet V. striata Ait. 



20. Petals pale violet; sepals glabrous; leaves obtuse; stipules 

 usually less than 1.5 cm. long; woods. Cook Co., A. Chase. 



Apr. -May. Dog Violet V. conspersa Reichenb. 



16. Plants annual; stipules large, pectinate; style enlarged at the hollow apex. 

 21. Upper leaves entire or nearly so; flowers 7-10 mm. long; petals twice 

 the length of the sepals; sandy soil in fields and open woods, com- 

 mon. Apr.-June. Wild Pansy V. rafinesqiin Greene 



21. Upper leaves crenate-serrate. 



22. Petals shorter than or barely exceeding the sepals; fields and road- 

 sides, occasional; adv. from Eur. May-July. Field Pansy 



V . arvensis Murr. 



22. Petals much longer than the sepals; occasionally found as an 



escape from cult.; native of Eur. Garden Pansy 



V. tricolor L. 



109. Passifloraceae Dum. — Passion-flower Family 



1. Passiflora L. — Passion-flower 



1. Leaves deeply 3-5-lobed, the lobes serrate; flowers subtended by a conspicu- 

 ous involucre of 3 bracts; petals lavender or whitish; dry soil, s. 111. 



May-July P. incarnata L. 



1. Leaves obtusely 3-lobed above the middle, the lobes entire; flowers without 

 an involucre; petals greenish yellow; thickets, s. HI., extending northw. to 

 Pike and Wabash counties. May-July P. lutea L. 



110. Cactaceae Lindl. — Cactus Family 

 1. Opuntia Mill. — Prickly-pear 



O. rafinesquii Engelm. Sandy soil, locally abundant; known from Lake, 

 Cook, Mason, Adams, Jackson, Union, Johnson, and Pope counties. [(?) O. 

 humijiisa Raf.] 



111. Thymeleaceae Reichenb. — Mezereum Family 

 1. DiRCA L. 

 D. pahistris L. Leatherwood. Woods and thickets, local. Apr.-May. 



112. Elaeagnaceae Lindl. — Oleaster Family 

 1. Shepherdia Nutt. 

 S. canadensis L. Canadian Buffalo-berry. Dry bluffs and banks or ravines, 

 near L. Michigan; Lake Forest, HAl in 1904; Glencoe, G. D. Fuller in 1943. 



