408 Compositaceae 
FF. Heads peduncled, either terminal on the branches or clustered. 
G.  Salt-marsh plants; leaves fleshy. CoTULA (p. 409) 
GG. Not salt-marsh plants: leaves not fleshy. . 
H. Heads terminal on the leafy branches: receptacle conic. 
MatRricariA (p. 408) 
HH. Heads in flat-topped leafless clusters: receptacle flat or hemispheric. 
TANACETUM (p. 409) 
HHH. Heads in bracted spikes or racemes or panicles, not in flat-topped 
clusters; receptacle flat to hemispheric. ARTEMISIA (p. 410) 
AA. — Shrubs. ARTEMISIA (p. 410) 
ANTHEMIS 3 MAYWEED 
Herbs, annual or perennial. Leaves alternate, pinnatifid or dissected. Heads large, 
radiate (ours) ; involucre-bracts imbricated in several series, scarious-margined, appressed, 
the outer shorter; receptacle convex to oblong, somewhat chaffy. Ray-flowers pistillate 
and fertile, or neutral, white or yellow, entire or 2——3-toothed. Disk-flowers perfect, 
fertile, yellow, 5-lobed. Akenes oblong, angled or ribbed. Pappus none or a mere 
border. (The Greek name.) | 
A. Rays white. 
B. Leaves glabrous, with bad odor: rays neutral. W. E. 
A. cotula L. (Dog Fennel) 
BB. Leaves pubescent, without bad odor; rays fertile. W. FE. 
A. arvensis L. (Field Mayweed) 
AA. Rays yellow; leaves somewhat tomentose. W. 
A. tinetoria L. (Yellow Mayweed) 
ACHILLEA YARROW 
Herbs, perennial; stems leafy, erect. [eaves alternate; in ours finely dissected into 
very many segments. Heads radiate, small, in corymbs, terminal on stem and branches; 
involucre narrow, its outer bracts shortest; receptacle chaffy, conic to oblong. Ray-flowers 
pistillate, fertile, short, wide, white to rose-colored. Disk-flowers few, inconspicuous, yel- 
low. Akenes obcompressed, oblong or obovate, glabrous. Pappus none. (Honor of 
Achilles, who first used it as a vulnerary.) W.C.E. (A. millefolium lanulosa. ) 
A. millefolium L. 
MATRICARIA CAMOMILE 
Herbs, annual. Leaves alternate, 2—3-dissected into narrow or filiform segments. 
Heads rayless or radiate, on peduncles; involucre hemispheric, the outer bracts shorter ; 
receptacle conic or ovoid, naked. Ray-flowers pistillate, fertile, white; disk-flowers perfect, 
fertile, yellow; akenes 3—5-ribbed, glabrous, oblong. Pappus none (ours) or crown- 
like. (L. mater==mother, cara—dear; dear to mothers from reputed medicinal properties. ) 
A. Heads radiate. 
B. Rays 20—30; pappus a crown, entire or 4-toothed; akenes obpyramidal, promi- 
nently 3-ribbed; herbage nearly odorless. W. 
M. inodora L. (Scentless Camomile) 
BB. Rays 10—20; pappus none; akenes oblong, faintly 3—5-ribbed;: herbage sweet- 
scented. W. E. M. chamomilla L. (Garden Camomite) 
AA. Heads rayless) W.C.E. (M. discoidea; M. matricarioides. ) 
M. suaveolens Buch. (Pineapple Weed) 

