Botanical Papers. 193 



Mentzelia nuda Torr. & Gray. 

 Mentzelia ornata Torr. & Gray. 



Cucurbitacea?. 



Cicyos angulatus Linn. 



Banks and damp, wooded ground. 



Cactaceae. 



Mamillaria vivipera Haw. Cactus. 



Mamillaria missouriensis Sweet. 



Opuntia rafinesquii Engelm. Prickly-pear. 



These three species of cactus are found on the dry prairies and the 

 broken country. 



UmbelliferEe. 



Polytttnia nuttaUii Dc. 



Everywhere in early spring (April 1). 

 Feucedanum foeniculaceum Nutt. 

 Feucedaneum villosum Nutt. (April 1). 



Composita3. 



Erigeron annuus Fers. Daisy fleabane. 

 Ambrosia artemisiajfolia Linn. Hogweed. 

 Xanthium strumarium Linn. Cockle-bur. 



Too common. 

 Chrysanthemum leucanthemum Linn. Whiteweed. 



A pernicious weed everywhere. 

 Krigia virginica Willd. Dwarf dandelion. 



Very common, usually flourishing best in the middle uplands. 

 Helianthus annuus Linn. Common sunflower. 

 Helianthus orgyalis Dc. 

 Helianthus grosse serratus Martens. 

 Helianthus maumiliani Schrader. 

 Helianthus subcanescens Gray. 

 Solidago nemoralis, var. incana. Gray. Goldenrod. 

 Cincus lanceolatus Hofli'm. Common thistle. 



Common on broken ground. 

 Bidens bipinnata Linn. Spanish needle. 



Few and scattering. 



LobeHacese. 



Lobelia inflata Linn. Indian tobacco. 

 Common; used as Indian medicine. 



Oleacese. 



Fraxinus americana Linn. White ash. 



Moist woods. 

 Fraxinus pubescens Linn. Red ash. 



Common along streams. 



Asclepiadacese. 



Asclepias cornuti Descaisne. Common milkweed. 

 Asclepias verticillata Linn., var. pumula Gray. 

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