BOTANY OF LA SALLE COUNTY. 95 



HELIANTHUS. Sunflowers. Tall, stout plants. 

 H. annu us. Common Sunflower of gardens. 

 H. rigidus. Rough, leaves thick, rigid. 

 H. lactiflorus. Leaves thinner than in rigigus. 

 H. occidentalis. Hairy, slender; heads 1 to 5 on 



long peduncles. 

 H. mollis. Leaves opposite, sessile, some serrate 



leafy to top. 

 A. tomentossus. Stout, 4 to 8 ft.; leaves oval, 



clasping. 

 H. grosse serratus. Smooth 6 to 12 ft. Leaves 



long narrow, acute, sessate. 

 H. giganteus. Hairy, rough, 3 to 1Q ft.; leaves 



scarcely serrate. 

 H. doronicoides. Roughish, 3 to 7 ft.; leaves 



sessile, ovate-oblong. 

 H. divaricatus. Smooth; leaves opposite spreading 



sessile, serrate, thickish 

 H. strumosus. Smooth below; leaves long-ovate, 



acute, rough above, whitish below. 3 to 6 ft. 

 H. decapet alus. Leaves ovate, acute; petioles 



margined; rays about 10. 2 to 5 ft. 

 H. tuberosus. Leaves ovate, acuminate, rough 



above; eometimes cultivated for its tuberous 



roots. 

 W. H. angustifolius. Rough, 2 to 6 ft.; leaves linear, 



sessile. 

 ACTINOMERIS. P. Leaves serrate tapering to 



base and running down the stem. 

 A. squarrosa. Hairy, winged, 4 to 8 ft.; leaves 



alternate or opposite; rays Y. 

 COREOPSIS. Leaves opposite, rays Y. or Y. 



blotched with P., rarely wholly P. 

 C. lanceolafa. Branched at base, smooth; leaves 



entire, thick, heads large and showy; rays lobed. 



