THISTLE FAMILY 959 



or glabrate, twice pinnatmd; primary segments more or less spreading, more or 

 less decurrent into the ^s-ing-margins; secondary segments short, lanceolate, flat, 

 spinulose-tipped; involucres 4—5 mm. high, 3-4 mm. broad; bracts Ianco-elli])tic 

 or elliptic, obtuse, with brown (rarely nearly black) margins; ligules 2-3 mm. 

 long and broad. Shores, hillsides, and roadsides: Newf.—Va.— Colo.— B.C.; 

 nat. or adv. from Eu. Je-S. 



10. A. multiflora Hook. Stem 3-10 dm. high, villous; leaves linear, 5-10 

 cm. long, 5-8 mm. broad, somewhat pubescent or glabrate, pcctinately cleft into 

 lanceolate, serrulate lobes; involucres 4-5 mm. high, 4-6 mm. broad; bracts 

 more or less villous, elliptic with brown margins; ligules 10-12, suborbicular, 

 1-1.5 mm. long. Valleys: Mack.— Sask. — Alaska. Boreal. Jl-Au. 



116, ANTHEMIS L. Corn Chamomile. 



Annual or perennial herbs. Leaves alternate, mostly pinnatifid or bipinnat- 

 ifid. Heads solitary at the ends of the branches, usually radiate. Involucre 

 saucer-shaped; bracts in about 3 series of nearly the same length, usually thin; 

 receptacle conic to hemispheric, chaffy; paleae membranous with a distinct mid- 

 rib. Ray-flowers pistillate and fertile; ligules wliite. Disk-flowers herma- 

 phrodite and fertile; corollas yellow. Anthers with ovate obtuse tips. Style- 

 branches truncate and fimbriate at the apex. Achenes subcylindnc or somewhat 

 obovoid, not angled, with filiform ribs. Pappus wanting, or a minute cro\\Ti. 



1. A. arvensis L. A leafy annual; stem 2-5 dm, high, branched, hirsute- 

 villous* leaves 3-5 cm. long, bipinnatifid, with Unear-lanceolate cuspidate lobes, 

 hirsute-villous ; involucre 4-5 mm. high, 7-12 mm. broad; bracts villous4ursute; 

 receptacle conic; paleae linear-lanceolate, abruptly cuspidate; ligules white, 7-12 

 mm long, 3-4 mm. wide; achenes subcylindric, 10-ribbed; pappus a minute 

 border. Field and waste places: Me.— Ga.— Ore.— B.C.; adv. or nat. from Eu. 



117. MARUTA Cass. May Weed, Dog Fennel, Dog Chamomile. 



Leafy annuals. Leaves alternate, bipinnatifid, with narrow divisions. 

 Heads radiate, solitary at the ends of the branches. Involucre saucer-shaped; 

 bracts in 2 series, subequal. Receptacle conic, chaffy towards the apex; paleae 

 subulate, stiff, rather persistent. Ray-flowers 10-15, neutral; ligules white. 

 Disk-flowers hermaphrodite and fertile; corolla-tube cylmdric, longer than the 

 funnelform throat; lobes 5, ovate, spreading. Anthers ^ith ovate obtuse tips. 

 Stvle included with short branches truncate and fimbriate at the apex. Achenes 

 nearly cylindric, 10-ribbed, glandular-tubercled. Pappus wanting. 



1 M Cotula (L.) DC, Annual, with fetid odor; stem glabrous or slightly 

 Dubescent above, 3--6 dm. high; leaves 3-5 cm. long, t^\'ice or thrice pinnatifid, 

 with narrow Unear-filiform divisions; glabrate or somewhat hairj'; involucre 

 8-12 mm. broad; bracts oblong, obtuse, somewhat pubescent; hgides 10-18, 

 wKi+P «hout 1 cm lonff, at length reflexed. A7ithemts Colula L. Fields and 

 wS^te pto NeTi:-ria.-Calif^-B.C.-Yukon; nat. from Eu. Plain-Syb- 



mont. Jl-S. 



118 CHAMOMILLA (Hall.) Gilib. Chamomile, Pineapple-weed, 



Green Dog-fennel. 



Mostly annual glabrous herbs. Leaves alternate, once to thrice pinnatifid 

 into narrow divisions. Heads solitary or corjinbose, radiate or discoid. Invo- 

 li ore saucer-shaped to hemispheric; bracts in 2-4 series, somewhat imbricate, ob- 

 Jnqp scarious-margined ; receptacle conic, hemispheric, or subglobose, naked. 

 TUv' flowers if present, pistillate and fertile; ligules white. . Disk-flowers numer- 

 ous hermaphrodite and fertile; coroUas yellow; anthers with ovate obtuse tips; 

 ?K fe-branches short, with truncate tips. Achenes usuaUy asymmetric, ^ith 3-5 

 ribs on the inner half, the back being nerveless. Pappus of a more or less de- 

 veloped crown or margin. [Matricaria L., in part.] 



1 C suaveolens (Pursh) Rydb. Annual; stem glabrous, very leafy, much 

 K«,nrhpd 1-4 dm. high; leaves glabrous, 2 or 3 times pmnatifid, with hnear acute 



