Class XIX. Order III. 203 



sile, nearly smooth, divided and subdivided into linear segments. 

 Flower stalks solitary, striated. Calyx scales narrow, slightly 

 margined. Florets of the ray white, spreading, a dozen or more 

 in number. Disc yellow, convex. Receptacle nearly cylin- 

 drical. The plant has a strong, peculiar smell, and reputed 

 medicinal virtues. 



237. ACHILLEA. 



ACHILLEA MILLEFOLIUM. L. Common FfllTOlC. 



Leaves bipinnatifid, hairy, their divisions lin- 

 ear, toothed, mucrouate ; stems furrowed. Sm. 



Common Yarrow is a frequent inhabitant of dry pastures 

 and fields. Stem erect, furrowed, hairy, branched at top. 

 Leaves alternate, cut into a multitude of very small, linear sub- 

 divisions. Flowers white, forming a large, flat topped, crowd- 

 ed corymb. Calyx ovate. Disc convex. Florets of the ray 

 four or five. The plant has a strong, penetrating taste and 

 smell, and is used medicinally. July, August. Perennial. 



238. HELIANTHUS. 

 HELIANTHUS DIVARICATUS. L. Small, rough Sunflower. 



Leaves opposite, sessile, ovate-oblong, three 

 nerved ; panicle dichotomous. L. 



A shewy plant, not uncommon in woods and thickets, flow- 

 ering in August and September. Stem erect, round, smooth, 

 generally covered with glaucous powder. Leaves opposite, 

 narrow-ovate, rounded at base, tapering to a long point, slightly 

 serrate, three nerved, and very rough. Flowers yellow, in the 

 wild plant but few in number, in the cultivated one numerous. 

 Branches of the panicle either forked or three parted. Percrt- 

 nial. 



This plant has an agreeable, somewhat spicy odour. 



