COMPOSITAE (COMPOSITE FAMILY) 505 



what auricled. Flower-heads yellow, without rays, about a 

 quarter-inch broad, the bracts of the involucre linear, with a few 

 awl-shaped outer ones which are black-tipped. Achenes oblong, 

 finely ribbed, minutely hairy, with a very copious, fine, white 

 pappus, by help of which they are widely wind-sown. 



Means of control 



Frequent hoe-cutting while the plants are too young to develop 

 seed. A spray of four-per-cent Copper-sulfate solution will blast 

 buds and temporarily check seed development, but will not harm 

 the smooth foliage, so that the plant recovers and the operation 

 requires to be repeated. 



BUTTERWEED 



Senecio glabellus, Poir. 

 (Senecio lobatus, Pers.) 



Other English name: Cress-leaved Groundsel. 



Native. Annual. Propagates by seed. 



Time of bloom: March to June. 



Seed-time : May to July. 



Range: North Carolina to southern Illinois 



and Missouri, southward to Florida, Texas, 



and New Mexico. 

 Habitat: Fields, meadows, and waste places. 



A rather stout, coarse plant, with furrowed, 

 hollow, and succulent stem, one to three feet 

 tall, sparingly branched. Leaves alternate, 

 three to ten inches long, smooth, fleshy, and 

 tender, and most variable in shape ; they are 

 pinnately divided, the segments rounded or 

 oblong or spoon-shaped or pointed, with wavy- 

 toothed edges or entire, but usually with ter- 

 minal segment larger than the others; the 

 basal and lower leaves have slender petioles, 

 but those above are sessile. Flowers in open 

 corymbose clusters, the heads about three- ' 



. rio. 351. But- 



fourths of an inch broad, bright yellow, with terwecd (Senecio gla- 

 six to twelve broad, wedge-shaped rays, bellus). x . 



