12. CiSTACEAE 63 



15. Flowers large (1-2 cm broad), violet, or sonietiuu's white, 

 very fragrant; style hooked; leaves broadly o\ate, cordate, 

 crenate, finely pubescent; stolons rooting at the nodes; 

 seeds cream colored; roadsides and waste places, occa- 

 sional; introd. from Eur. and often cultivated. A]jr.-June. 



Sweet Violet V. odorata L. 



1. Plants caulescent at flowering time; flowers axillary. 

 18. Plants perennial; stipules toothed or entire, bract-like. 

 19. Petals yellow. 



20. Plants nearly glabrous; basal leaves usually ])resent at 

 flowering time; seeds 2-2.5 mm long; woods, com- 

 mon. Apr.-May. Common Yellow Violet [V . pen- 



sylvanica Michx.; ] . scahriuscula Schw.] 



V . eriocarpa Schw. 



20. Plants decidedly pubescent; basal leaves usually absent 



at flowering time; seeds 2.6-3 mm long; moist woods; 

 chiefly n. 111. ; also Pulaski Co. Apr.-May. Downy 



Yellow Violet V. pubescens Ait. 



19. Petals violet or white. 



21. Stipules entire, scarious; petals violet or white; woods, 



rare. Apr.-June. Canada Violet [F. canadensis sensu 



auth., non L.] V . rugulosa Greene 



21. Stipules dentate or fimbriate. 



22. Petals creamy- white; sepals ciliolate; upper leaves 

 acute; stipules 1.5-2.5 cm long; alluvial soil, 

 common; apparently absent from the n.w. coun- 

 ties. Apr.-June. Cream Violet V. striata Ait. 



22. Petals pale violet; sepals glabrous; leaves obtuse; 

 stipules usually less than 1.5 cm long; woods, 

 rare; Cook Co., A. Chase. Apr.-May. Dog Violet 



I '. conspcrsa Reichenb. 



18. Plants annual; stipixles large, pectinate; sandy soil in fields and 

 open woods, common. Apr.-June. Wild Pansy. Johnny- 

 jump-up V . rafinesquii Greene 



12. Cistaceae Horan. — Rockrose Family 



1 . Low shrubs; leaves scale-like; petals 5, yellow, fugacious; styles slender, 



elongate I. Hudsonia 



1. Herbs; leaves not scale-like. 



2. Petals 5, yellow, fugacious; style short; pubescence stellate 



2. Helianthemurn 



2. Petals 3, greenish or red, persistent; style none; pubescence not stellate 



3. Lechea 



1 . Hudsonia L. 



H. tomentosa Nutt. Sandy soil, local: Fulton. Jo Daviess, and Lee 

 counties. May-July. 



