ye) COMPOSTTAE, Vou. ttl, 
92. MATRICARIA L.. Sp. Pl. 800. 1753. 
Annual or perennial, mostly erect berbs, similar to some species of the preceding genus, 
with alternate leaves, disseeted into Gliform or narrowly linear segments and lobes, and 
peduneled heads of both tubular and radiate Howers, or tays wanting in soaie species, bives 
lucre hemispheric, its bracts appressed, imbricated in few sertes, the outer shorter, Recep- 
tacle conic, elongated or hemispheric, naked. Rays, when present, white, pistillate and fertile. 
Disk-flowers yellow, perfect, fertile, their corollas -5-toothed. Anthers obtuse and entire 
at the base. Style-branches of the disk-llowers truncate, penicilate, ANehones 3 -5-ribbed. 
Pappus none, or a coroniform border, [ Latin, matrix, from its medicinal virtues, | 
About 20 species, natives of the northern hemisphere and South Africa. The following are the 
only ones known to occur in North America, ‘Type species. Matricaria ineddra L, : 
Rays present, white. 
Achenes obpyramidal, strougly gy ribbed, 
Plant tall, much branehed ; bracts of the involucre green. 1. Mo tnodora, 
Plant low, nearly simple, arctic; bracts dark brown or black. a Me grandiflora, 
Achenes uearly terete, oblong, faintly a gertbbed. 3. M, Chamomilta, 
Rays none; achenes oblong, faintly nerved. qe Mv matricarioides, 
1. Matricaria inodora |... Sccntless Camo- 
mile. Corn Mayweed. ig. 4505. 
— Matricaria inodora la EL Suce. ld. a, a07. 17556 
Chrysanthemion tnodoerum Le Sp. Ph Ed. a, 1253. 
1703. 
Annual; stent asually much branched, glabrous, 
or very nearly so throughout, 12° high, Leaves 
numerous, sessile, 2-3-pinnately disseeted into (ilt- 
form lobes, the rachis somewhat dilated at the 
base; heads several or numerous, terminating the 
branches, 414% broad; bracts of the involuere 
lanccolitte-oblong, obtuse, green with brown seari- 
OUS Margins; rays 20-30, white, spreading; reeep- 
tackle hemispheric or ovoid; achenes obpyramidal 
with three prominent ribs; pappus a short entire 
or f-loothed crown, 
In fields and waste places, Newfoundland to New 
Jersey, Pennsylvania and Michigan, Naturalized or 
ndyventive from Furepe. June Sept. 
2. Matricaria grandiflora (Ilook.) Britton, 
Arctic Camomile. ig. 4566, 
Chrysanthemoen grandiflonion Wook, in Parry's ad Voy, 398. 
1825, 
Pyrethrum inodorum var. nanum look, FL Bor. Am. 1: 
320, 1833. 
M. grandiflora Britton, Mem, ‘Torr, Club 5: 340. 1894. 
Perennial; stem usually simple and) monocephalous, 
glabrous, 4’-12" high. Leaves sessile, or the lowest 
short-petioled, t-2-pinnately  disseeted, 1/24" long; 
head not very long-peduncled, t-2' broad; bracts of 
the involucre ovate or ovate-oblong, obtuse, glabrous, 
brown or nearly black, or with broad, brown, scarious 
margins; rays 15-35, bright white, slightly 3 -5-toothed 
at the summit; receptacle hemispheric when mature. 
Coast of Hudson Bay to Alaska. Reported from Lake 
Huron, Summer, : 
