A. PTÁRMICA, L. (SNEEZEWORT.) _Leaves simple, lance-linear_, sharply serrate with appressed teeth; corymb loose; _rays 8--12, much longer than the broader campanulate involucre_; flowers white.--Mass., Mich., etc.; rare. Apparently indigenous on the Lower St. Lawrence. (Adv. from Eu.) 68. MATRICÀRIA, Tourn. WILD CHAMOMILE. Heads many-flowered; rays pistillate, or wanting. Scales 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.) M. INODÒRA, L. Leaves twice-pinnately divided into fine almost filiform lobes; _heads large_, naked-peduncled, and _with many long rays_; achenes strongly 3-ribbed; pappus a short crown or border.--(Wild far northward.) Roadsides, Eastport, Maine, _Prof. Verrill_. Aug. (Adv. from Eu.) M. DISCOÍDEA, DC. Low (6--9´ high); leaves 2--3-pinnately parted into short linear lobes; _heads rayless_, short-peduncled; scales oval, with broad margins, much shorter than the conical disk; achenes more terete; pappus obsolete.--Banks of the Mississippi opposite St. Louis. An immigrant from Oregon, extending eastward and becoming naturalized near railroad stations; also established in N. Europe. July--Sept. 69. CHRYSÁNTHEMUM, Tourn. OX-EYE DAISY. Heads many-flowered; rays numerous, fertile. Scales of the broad and flat involucre imbricated, with scarious margins. Receptacle flat or convex, naked. Disk-corollas with a flattened tube. Achenes of disk and ray similar, striate, without pappus.--Perennial herbs, with toothed, pinnatifid, or divided leaves, and single or corymbed heads. Rays white; disk yellow. (Old Greek name, χρυσάνθεμον, i.e. golden flower.) C. LEUCÁNTHEMUM, L. (OX-EYE or WHITE DAISY. WHITE-WEED.) Stem erect, nearly simple, naked above and bearing a single large head; root-leaves spatulate, petioled, the others partly clasping, all cut or pinnatifid-toothed; scales of the involucre with rusty-brown margins. (Leucanthemum vulgare, _Lam._)--Fields and meadows; abundant eastward. June, July. A pernicious weed, with large and showy heads. It occurs with abortive, deformed, or tubular and laciniate rays. (Nat. from Eu.) C. PARTHÈNIUM, Pers. (FEVERFEW.) Tall, branched, leafy; leaves twice-pinnately divided, the _divisions ovate, cut; heads corymbed_, rather small. (Leucanthemum Parthenium, _Godron_.)--Escaped from gardens in some places. (Adv. from Eu.) 70. TANACÈTUM, L. TANSY.