50 ELEMENTS OF BOTANY. 



or naked at the summit. Aromatic or ill-scented herbs, with 

 the leaves finely pinnately divided. 



(A. cotula), Mayweed, Dog-fennel. Heads small, produced 

 all summer, -with yellow disk and rather short white neutral rays ; 

 leaves irregularly cut into veiy many narrow segments. A low, 

 offensive-smelling annual weed, by roadsides and in barnyards. 



III. CHRYSANTHEMUM, CHRYSANTHEMUM, 

 OX-EYE DAISY. 



Heads nearly as in the preceding genus, except that the 

 ray-flowers are pistillate. Perennials with toothed pinnately 

 cut or divided leaves. 



a. (C. Leucanthemum), Ox-eye Daisy, Whiteweed, Bull's- 

 eye, Sheriff Pink. Stem erect, unbranched or nearly so, 1-2 ft. 

 high ; root-leaves oblong-spatulate, petioled, deeply and .irregularly 

 toothed ; stem-leaves sessile and clasping, toothed and cut, the upper- 

 most ones shading off into bracts. Heads terminal and solitary, 

 large and showy, with a yellow disk and many white rays. A trouble- 

 some but handsome perennial weed. 



b. (C. fkutescens), Marguerite. Erect, branching, woody 

 below, smooth and with a pale bloom ; divisions of the leaves linear, 

 with the uppermost leaves often merely 3-oleft bracts ; heads long- 

 pedunoled, showy, with a yellow disk and large, spreading white 

 rays. Perennial, cultivated in greenhouses, from the Canary Islands. 



IV. SENECIO, GROUNDSEL. 



Heads many-flowered ; ray-flowers pistillate or wanting ; 

 involucre usually of a single row of equal, erect scales. 

 Eeceptacle flat and destitute of scales or chaff. Akenes 

 tufted with abundant, soft, hair-like bristles. Mowers in 

 most cases yellow. 



(S. aureus), Golden Ragwort, Squaw-weed, Snake-root. 

 Sometimes covered with cottony wool when young, sometimes smooth, 

 1-3 ft. high ; root-leaves varying greatly in shape in different varieties, 

 long-petioled ; lower stem-leaves obovate, with deep and narrow lobes 

 toward the base ; upper stem-leaves lanceolate, pinnately cut, sessile 

 or with a somewhat clasping base ; heads rather small, with 8-12 

 rays, in an umbel-shaped corymb. Many well-defined varieties are 

 known. Perennial. 



