DICOTYLEDONOUS PLANTS 231 
Heads numerous. Ray-flowers 10-15, neutral, yellow or yellow and 
brown ; disk-flowers purple. Akenes hairy on the ribs; pappus of 
ovate, minutely toothed, awned scales. Common on river banks S.* 
VI. ANTHEMIS, L. 
Aromatic or ill-scented herbs. Leaves finely pinnately 
divided. Heads many-flowered, with ray-flowers. Rays pis- 
tillate or neutral. Involucre of many small, dry, close-pressed 
scales. Akenes nearly cylindrical, generally ribbed; barely 
crowned or naked at the summit. 
1. A. Cotula, DC. Maywerep, DoG-FENNEL. Leaves irregularly 
cut into very many narrow segments. Heads small, produced all 
summer. Disk yellow. Rays rather short, white, neutral. A low, 
offensive-smelling annual weed, by roadsides and in barnyards. 
Vl. ACHILLEA, L. 
Perennial; leaves alternate, pinnately divided. Heads with 
ray-flowers in a terminal corymb; involucral bracts imbricated 
in several series, the outer shorter; receptacle chaffy. Ray- 
flowers white or pink, pistillate and fertile; disk-flowers per- 
fect, tubular, 5-lobed. Akenes oblong, compressed, slightly 
margined. Pappus none.* 
1. A. Millefollum, L. Yarrow. Stems often clustered, erect 
from a creeping rootstock, simple, downy or woolly, 1-2 ft. high. 
Leaves lanceolate or oblong, the segments finely cut and divided, 
smooth or downy, the lower petioled, the upper sessile. Heads 
small, numerous, in flat-topped corymbs; bracts downy. Ray-flowers 
4-5, white or pink, rays 3-lobed at the apex. Common in old fields.* 
VI. CHRYSANTHEMUM, Tourn. 
Perennials, with toothed, pinnately cut or divided leaves. 
Heads nearly as in the Anthemis, except that the ray-flowers 
are pistillate. 
1. C. Leucanthemum, L. Oxryre 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, 
