Sgngenesm. 
im 
lower leaves lyre-shaped, angular ; upper leaves ovate;. 
Common in pastures and by way-sides. 
Cent. Cyanus, Corn Blue-bottle ; with the scales of 
the calyx serrated ; leaves linear, entire; lower leaves 
toothed. Common among corn. 
Rudbeckia. Gen. char.- — Recept. chaffy, conical ; 
down with a four-toothed margin ; cal. with a double 
series of scales. 
Rud. Purpurea , Purple Rudbeckia; with lanceolate- 
ovate leaves, alternate, undivided, and petals of the ray 
two-cleft. Native of Carolina and Virginia, but culti- 
vated in the open ground in this country. 
Helianthus. Gen. char. — . Recept. chaffy; down 
awned ; cal. ragged. 
Hel, Multiflorus, Many-flowered Sun-flower ; with 
inferior leaves heart-shaped, three-nerved ; upper leaves 
ovate. Native of North America, and a hardy peren- 
nial in the gardens of this country. 
Hel. AnnuuSy Common Sun-flower ; is a well known- 
and shewy annual in every garden ; and Hel. Tuherosus , 
Jerusalem Artichoke, is sometimes cultivated for the 
sake of its tuberous roots, which are eaten like potatoes. 
Order IV. Poetgamia Necessaria. 
In this order the florets of the disk have only sta- 
mens, and those of the margin have pistils only. 
Calendula Officinalis , Garden Marygold, in which 
