846 



COMPOSITAE (COMPOSITE FAMILY) 



leaves silky-lanate ; corymbs 2-10 cm. broad, venj convex; involucre pubescent, 

 none of its bracts dark-margined ; rays 1-2.5 mm. long. — Gravelly shores and 

 open ground, Gulf of St. Lawrence to Mich., thence westw, and southwestw.; 

 naturalized in the Eastern States. (Hex.) 



1005. A. Cotula. 

 Leaf and ray x 1%. 



68. ANTHEMIS [Mich.] L. Chamomile 



Heads many-flowered, radiate ; rays pistillate or (in no. 1) neutral. Invo- 

 lucre hemispherical, of many small imbricated dry and scarious bracts shorter 

 than the disk. Receptacle conical, usually vs^ith slender chaff at least near the 

 summit. Achenes terete or ribbed, glabrous, truncate ; pappus none or a minute 

 crown. — Branching often strong-scented herbs, with pin- 

 nately dissected leaves and solitary terminal heads ; rays 

 white or yellow (rarely wanting) ; disk yellow. ('Af^e/i^s, 

 the ancient Greek name of the Chamomile.) 

 * Bays white. 

 -1- Chaff of the receptacle sharp-pointed. 



1. A. Cotula L. (May-weed, Dog Fennel.) Annual, 

 acrid, ill-scented ; leaves finely 3-pinnately dissected ; rays 

 mostly neutral ; receptacle without chaff 

 near the margin; pappus none; achenes 

 tuherculate-roughened. (Maruta DC.) — 

 Common by roadsides. (Nat. from Eu.) 

 Fig. 1005. 



2. A. ARVENSis L. (Corn C.) Pubes- 

 cent annual or biennial, resembling May- 

 weed, but not ill-scented ; leaves less rinely 1-2-pinnately 

 parted ; chaff of the receptacle lanceolate, pointed, subtending 

 all the disJc-fiowers and distinctly exceeding them ; achenes 

 smooth on the sides ; pappus a minute border. — Roadsides, 

 waste places, etc., occasional. (Adv. from Eu.) Fig. 1006. 

 Var. agrestis (Wallr.) DC. Chaff of the receptacle shorter 

 than the disk-flowers. — Fields, etc., becoming frequent. (Nat. 

 from Eu.) 



-I- ••- Chaff of the receptacle blunt. 



3. A. n6bilis L. (Garden C.) More downy and perennial^ pleasantly 

 strong-scented; sterile shoots depressed or creeping; leaves very finely dis- 

 sected ; pappus none. — Occasionally spontaneous about old gardens. (Introd. 

 from Eu.) 



* * Bays yellow. 



4. A. tinct6ria L. (Yellow C.) Pubescent perennial; leaves pinnately 

 divided ; heads long-peduncled, 3-4 cm. broad ; chaff of the receptacle lanceo- 

 late ; pappus a short crown. — Fields and waste places, becoming frequent. 

 (Nat. from Eu.) 



A. aurea (L.) DC, with small rayless heads has been found near St. Louis, 

 Mo. {Engelmann). 



1006. A, arvensis. 

 Leaf and ray x 1%. 



69. MATRICARIA [Tourn.] L. Wild Chamomile 



Heads many-flowered ; rays pistillate or wanting. Bracts of the involucre 

 imbricated, with scarious margins. Receptacle conical (at least in fruit), naked. 

 Achenes 3-5-ribbed, wingless ; pappus a membranaceous crown or border, or 

 none. — Smooth and branching herbs (ours annuals or biennials) with finely 

 divided leaves and single or corymbed heads. Rays white or none ; disk yellow. 

 (Named for reputed medicinal virtues.) 



1. M. inot)6ra L. Leaves bipinnately divided into tine almost filiform lobes ; 

 heads large, 3-4 cm. broad^ naked-peduucled, and with many long rays; achenes 



