GENUS QI. THISTLE FAMILY. 
3. Chrysanthemum ségetum L. Yeliow Ox- 
eye. Corn Marigold. Fig. 4562. 
Chrysanthemum segetum L, Sp. Pl. 889. 1753. 
Annual, glabrous, 13° high or less. Leaves oblong 
to oblanceolate, the upper auriculate-clasping, the 
lower petioled, dentate, incised, or nearly entire, 3’ 
long or less; heads about 13’ broad; involucral bracts 
obtuse, scarious; rays obovate, yellow, emarginate; 
pappus a mere margin. 
Waste grounds, New York, New Jersey, and in ballast 
about the seaports. Adventive from Europe. 
Chrysanthemum coronarium L., also European, with 
yellow rays and bipinnatifid leaves, has been found in 
Ontario. 
4. Chrysanthemum Parthénium (L.) 
Pers. Common Feverfew. Feather- 
few. Fig. 4563. 
Matricaria Parthenium L. Sp. Pl. 890. 1753. 
C. Parthenium Pers. Syn. 2: 462, 1807. 
Perennial; stem puberulent or glabrate, much 
branched, 1°-23° high. Leaves thin, the lower 
often 6’ long, petioled, or the upper sessile, 
pinnately parted into ovate or oblong, pinna- 
tifid or incised segments; heads numerous, co- 
tymbose, slender-peduncled, 6-10” broad; 
bracts of the depressed involucre lanceolate, 
rather rigid, keeled, pubescent, acute or acutish; 
rays 10-20, white, oval or obovate, spreading, 
mostly toothed, long-persistent; pappus a short 
toothed crown. 
In waste places, New Brunswick and Ontario to 
New Jersey, Ohio, and in California, mostly es- 
eaped from gardens. Naturalized or adventive 
from Europe. Called also pellitory, wild camo- 
mile. Rays variable in length. Summer, 
5. Chrysanthemum Balsamita L. Cost- 
mary. Mint Geranium. Fig. 4564. 
C. Balsamita L. Sp. PL Ed. 2, 1252. 1763. 
Pyrethrum Balsamita Willd. Sp. Pl. 3: 2153. 1804. 
Perennial, puberulent or canescent; stem 
much branched, 2°-4° high. Leaves oblong, 
obtuse, crenate-dentate, 1-2’ long, those of the 
stem mostly sessile, and often with a pair of 
lateral lobes at the base; heads numerous, co- 
rymbose, slender-peduncled, 5-8” broad, or 
when rayless only 3” broad; bracts of the in- 
volucre narrow, obtuse, pubescent; rays 10-15, 
white, spreading; pappus a short crown. 
Sparingly escaped from gardens, Ohio to Mich- 
igan, Ontario and Nova Scotia. Native of the Old 
World. Other English names are cost, alecost, ale- 
coast. Summer. 
