270 NEBRASKA STATE HORTICULTURAL SOCIETY. 



t Center of "flower" flat, with yellow rays. 



* Leaves deeply lobed. The edges of the leaves are tui-ned 

 north and south, hence the name "Compass Plant" 



Compass Plants {Silphium) 

 ** Leaves opposite, and united into a cup. Insects are 

 caught in great numbers in the cups, which usually con- 

 tain water Cup Plants {Silphiu7n) 



*** Leaves scattered on the stem, not lobed. There are 

 many species, the largest of which is the parent of the 



cultivated sunflowers Sunflowers {Helianthus) 



tt Center of "flower" a projecting cone. .Coneflowers (Rudbeckia) 

 V. "Flower" of many, minute, irregularly clustered flowers, the 



whole wand-like Golden Rods {Solidago) 



b. Flowers medium sized to small, less than 1 inch across, 

 i. Flowers open, saucer-shaped. 



t Plants large, coarse, woolly-hairy; a common weed in east- 

 ern Nebraska Mullein ( Verbascum) 



tt Plants slender, with sensitive leaves Wild Senna (Cassia) 



ttt Plant low, spreading, with covered edible berries 



Ground Cherries (Physalis) 



ii. Flowers like those of the pea Wild Peas (Thermopsis) 



ill. Flowers like little curved trumpets; pods exploding when 



ripe Touch-me-nots (Impatiens) 



iv. "Flower" compound, of many minute flowers, the whole 

 resembling a simple flower, 

 t Plants sticky, 1 to 2 feet high, containing gum, 



Gumweeds ( Grindelia) 



tt Plants not sticky Golden Asters (Chrysopsis) 



Here may be sought the various species of 



Wild Parsley (Zizia) 

 and the ubiquitous and weedy. . . .Dandelions (Taraxacum) 



D. FloweRvS White. 



I. Plants aquatic, with round, floating leaves, 



White Water Lilies (Castalia) 



II. Plants terrestrial. 



1. Climbing plants. 



a. Leafy vines with large funnel-shaped flowers, 



White Morning Glories (^Convolvulus) 



b. Leafy vines with clustered small flowers. Virgin's Bower (Clematis) 



c. Leafless, yellow, parasitic vines. These are common in clover 

 and alfalfa fields Dodders ( Cuscuta) 



2. Plants not climbing. 

 a. With milky juice. 



i. Leaves alternate and prickly; flowers large. (In central and 

 western Nebraska) Wild Poppies (Argemone) 



