400 OKDEK LXVIII. COMroSIT.E. 



» 



naceous margins ; florets numerous, covered externally with a glandu- 

 lar pubescence. Seeds angular, striate ; receptacle flat. — Pale purple. 

 U. April — May. Middle and upper districts of Car. and Geo. 1 — 2 

 feet. 



8. M. angustifo'lia, (Pursh.) Stem erect, branching, angular, gla- 

 brous, or slightly pubescent toward the summit. Leaves long, narrow- 

 lanceolate, glabrous ; the upper ones linear. Flowers solitary, termmal ; 

 involucre with numerous subulate leaves. Corolla pubescent without. 

 Seed angular. — Pale purple. 2f . May — June. In pme-barrens. 1 — 

 2 feet. 



Sub-tribe VI.— ANTHEMIDE'^. 



Heads mostly heterogamous ; ray florets pistillate, ligulate, 

 or tubular ; disk florets usually perfect. Pappus small or none. 



Genus LXVIL— AX'TIIEMIS. L. {Jfaruta, Cass.) 

 (From anthemon, a flower, in allusion to the great number of flowers.) 



Involucre hemispherical, many-leaved, with leaves nearly 

 equal ; ray florets pistillate ; disk florets perfect. JRecej^tacle 

 chaffy, with the chaff rigid and acuminate. Seed naked. Pajy- 

 pus wanting or none. 



1. A. cot'ula, (L.) Stem erect, pubescent, slightly angled, much 

 branched. Leaves bipinnate, with subulate, 3-parted segments. Flow 

 ers in terminal corymbs ; involucre many-leaved, pubescent ; ray florets 

 10 — 12. /Sefc? slightly angular ; receptacle conic, with subulate chaff. 

 — White. 0. May — June. Moist soils. Very common. 1 — 2 feet. 



{Marutit cotula, D. C.) Mayweed. 



Genus LXVIII.— ACHILLE' A. L. 



(Named after Achilles, a pupil of Chiron.) 



Involucre ovate, imbricate, many-leaved; ray florets ' pistil- 

 late, those of the disk perfect. Recei^tacle chaffy. Pappus 

 none. 



1. A. millefo'liiim, (L.) Stem erect, pubescent, furrowed, branched 

 at the top. Leaves bipinnate, with the segments linear, acute, glabrous. 

 Flowers in dense, terminal corymbs ; involucre with the leaves ovate- 

 lanceolate, pubescent ; ray florets 4 — 5. — White or pale red. If. July 

 — ^Aug. 1 — 2 feet. Yarrow. 



Genus LXIX.— LEUCAN'THEMUM. Tourn. 

 (From leuJcos, white, and anthemon, a flower.) 



Heads many-flowered ; ray florets numerous, pistillate. In- 

 volucre imbricate, broad. Receptacle flat or convex, naked. 

 Aclienia of the disk and ray similar. Pappus none. 



1. L. vulga're. Stem erect. Leaves laciniate toothed ; the cauline 

 ones clasping, the radical ones spatulate. — White. 10 — 18 inches. 



Daisy 



