IOWA ACADEMY OF SCIENCE 
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770. Pycnanthemum virginianum (L.) Dur. & Jack. Virginia Moun- 
tain-mint. Abundant in fields and woods. 
771. Pycnanthemum pilosum Nutt, Hairy Mountain-mint. Local on 
dry wooded hillsides. 
772. Pycnanthemum muticum (Michx.) Pers. Short-toothed Mountain- 
mint. Not uncommon in dry woods. 
LYCOPUS (Tourn) L. 
773. Lycdpus virginicus L. Purple Bugle Weed. Coinmon in marshy 
places and wet soils. 
774. Lycopus uniflorus Michx. Bugle Weed. Not rare on muddy 
banks. 
775. Lycopus americanus Muhl. Cut-leaved Water Hoarhound. Com- 
mon on banks of streams and marshes. 
MENTHA (Tourn) L. 
776. Mentha spicat a L. Spearmint. Rarely established. 
777. Mentha citrata Erhr. Bergamot Mint. Rare; Elmira. 
778. Mentha arvensis L. Var. canadensis (L.) Briq. American Wild 
Mint. Abundant in moist places. 
SOLANACEAE. 
SOLANUM (Tourn) L. 
779. Solanum nigrum L. Black Nightshade. In thickets and shaded 
waste places. 
780. Solanum carolinense L. Horse Nettle. Abundant in sandy soil 
in open places. 
781. Solanum rostratum Dunal. Beaked Nightshade or Buffalo-Bur. 
Rare; Iowa City. 
PHYSALIS L. 
782. Physalis pruinosa L. Tall Hairy Ground Cherry. Rather scarce 
in sandy fields. 
783. Physalis subglabrata Mack. & Bush. Philadelphia Ground Cherry. 
Not uncommon in fields and thickets. 
784. Physalis virginiana Mill. Virginia Ground Cherry. Dry gravelly 
soils ; not uncommon. 
