2 A. ptarmica L. Sneezewort. Lvs. linear, acuminate, equally and sharply serrate, smooth. - Found in moist grounds and shady places, Can. and N. Y. (Pursh), Mass. (Nichols). Plant about 15' high, branching at top into a diffuse corymb of white fls. The lvs. are remarkably distinct from the yarrow. The dried powder of the leaves, used as snuff, provokes sneezing. A variety with double flowers occurs which is quite ornamental in pots. Aug. † § Eur.
72. LEUCANTHEMUM, Tourn. White-weed. (Gr. , white, , flower; the heads have large, conspicuous rays.) Involucre broad, depressed, imbricated ; rays pistillate, numerous; receptacle flat, naked ; achenia striate ; pappus none. - Herbs with alternate lvs. Hds. radiate.
L. vulgare Lam. St. erect, simple or few-branched, with solitary heads; lvs. clasping, lanceolate and oblong, toothed above, cut-pinnatifid at the base; scales edged with brown. - Ц A great annoyance to the farmer, in fields and pastures, U. S. to Arc. Am. St. about 2f. high. Lvs. comparatively few and small. Heads large (13 - 16" broad). Rays many, ligulate, white. Jl. - Sept. § Eur. (Chrysanthemum Leucanthemum, L.)
ß. tubuliflorum (Tenney). Rays tubular, elongated, white, deeply cleft into 5 or 3 lobes. - Poughkeepsie, N. Y. (Mr. W. R. Gerard.)
73. MATRICARIA, Tourn. Fever Few. Involucre scales imbricate, many-flowered, with membranous margins; receptacle conical or convex, naked; pappus a membranous margin crowning the achenia, or none. - Herbs chiefly perennial, with alternate lvs. hds, with or without rays. (Pyrethrum, Smith.)
M. parthenium L Hds. radiate; lvs. petiolate, flat, tripinnate, the segm. ovate, cut; ped. branching, corymbous ; st. erect; invol. hemispherical, pubescent.- Fields, rare. Several varieties of the Fever-few are cultivated, and are in great favor with many florists, on account of their fine pyramidal form, surmounted with a corymb of pure white, double flowers which retain their beauty for several weeks.† Eur.
2 M. discoidea DC. Hds. discoid; lvs. sessile, 2 to 3-pinnately parted, lobe3 small, linear-oblong, acute; hds. on simple peduncles; scales equal, oval, obtuse, with white, scarious margins much shorter than the conical disk. - (1) I11. opposite ' St. Louis, also in Oregon. Sts. 3 to 8' high. Disk 2 to 3" broad and high. Pappus obsolete.
3 M. Balsamita Willd. English Mint. Pubescent; hds. discoid; st.erect; lvs. ovate, oblong, serrate, the lower petiolate, upper sessile, auriculate at base; hds. corymbed; pappus none. - Gardens. St. 1 to 2f high. The plant is yellowish green, clothed with loose, minute tomentum, with the fragrance of spoarmint.
74. CHRYSANTHEMUM, (Gr. , gold, , flower.) Heads heterogamous; involucre imbricate, hemispherical; the scales with membranous margins ; receptacle naked; pappus none. - Ornamental plants from China and other eastern countries. Lvs. alternate, lobed. Hds. radiate.
1 C. coronarium L. Annual; st. branched; lvs. bipinnatifid broader at the summit, acute. - Native of S. Europe and N. Africa. The variety with double flowers is frequently cultivated as a hardy annual. St. about 3f high, striate, smooth, erect, with alternate, clasping lva Fls. large, terminal, solitary, yellow. Aug.
2 C. carinatum Willd. Annual; Ivs. bipinnaie, fleshy, smooth; invol. scales carinate. - Native of Barbary. Hds. large and beautiful; disk purple, rays white, with a yellow base. A Variety has rays entirely yellow. Jl. - Oct. (C. tricolor Andr.)
3 C. Sinense Sabine. Perennial; Ivs. coriaceous, stalked, sinuate-pinnatifiJ, dentate, glaucous; rays very long. - A native of China, where it has long been cultivated and highly esteemed for its beauty. A great number of varieties have been produced with double, semidouble, and quilled flowers of every possible shade of color. It is of very easy culture in any common soil. The plants are propagated by divisions, by suckers, and by cuttings. (Pyrethrum Sinense DC.)
75. TANACETUM, L. Tansy. (Said to be a corruption of aoavaota, deathless; for the durable flowers.) Involuere hemispherical, imbricate, the scales all minute ; receptacle convex, naked ; pappus a slight, membranous border ; achenia with a large, epigynous disk. - Lvs. alternate, much dissected. Fls. yellow, discoid.
T. vulgare L. Lvs. pinnately divided, segments oblong-lanceolate, pinuatifid and incisely serrate; his. fastigiate-corymbous, ray fls. terete, tubular, 3-toolhed. -Ц in old fields and roadsides. Stems clustered, 2 - 3f high, branched above into a handsome corymb of yellow flowers. Aug. - The whole plant has a strong and aromatic smell and bitter taste. The seeds are anthelmintic. A variety called double tansey occurs, with dense and crisped leaves. § Eur.
2 T. Huronense Nutt. Lvs. bipinnaiely divided, lobes oblong, often again pinuatifid; hds. large, corymbd; ray fls. flattened, unequally 3 to 5-clefl. - Shores of Lake Huron and Mackinaw Strait, to Hudson's Bay. Plant 1 to 3f high, somewhat tomentous. Hds. larger than in No. 1, citron-yellow.
76. ARTEMIS'IA, L. Wormwood, etc. (Probably from Artemis, one of the names of the goddess Diana.) Involucre ovoid, imbricate, with dry, connivent scales; receptacle without pales; disk-flowers numerous, £, tubular, ray flowers few, often without stamens and with a subulate corolla or none; achenia with a small disk; pappus 0- Bitter herbs. Lvs. alternate. Cor. yellow or purplish, discoid.
§ Receptacle villous or hairy. Flowers all fertile.............
§Receptacle naked - Flowers all fertile. Leaves or segments lanceolate........
. ...Nos. 3. 4
- Flowers all fertile. Leaves or segments linear......
-Flowers of the disk sterile. Leaves or segments linear...
..Nos 7 - 9
1 A. frigida Willd. Lvs. pinnately parted, silky canescent, lfts. linear and 3 - 5-cleft; heads nodding, globuos, in panicled racemes; scales of the invol. canescent, roundish, the inner oblong; corollas glabrous. - Rocky hills, Miunesota, Dakota, and westward. Plant branched from base, 6 - 12'. July - Aug.