The drug plants of Illinois drugplantsofilli44teho Year: 1951 Tehon THE DRUG PLANTS OF ILLINOIS 19 AMBROSIA TRIFIDA L. Giant rag- weed, horse-weed. Compositae. — A very coarse herb up to '^ feet tall, aiuiual; stems stroiifj:, strai;^lit, branched, rough- hairy; leaves lar}j;e, opposite, petioled, ser- rate, often 10 to 12 inches wide, 3-ncrved, mostly 3-lobe(l, the lobes sharp-pointed; male flowers in green heads, the heads in loose to compact spikes up to 10 inches long; female flowers clustered in the axils of upper leaves. Leaves and tops collected hen the plant is in flower. Extreme

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The drug plants of Illinois  drugplantsofilli44teho Year: 1951  Tehon THE DRUG PLANTS OF ILLINOIS 19 AMBROSIA TRIFIDA L. Giant rag- weed, horse-weed. Compositae. — A very coarse herb up to '^ feet tall, aiuiual; stems stroiifj:, strai;^lit, branched, rough- hairy; leaves lar}j;e, opposite, petioled, ser- rate, often 10 to 12 inches wide, 3-ncrved, mostly 3-lobe(l, the lobes sharp-pointed; male flowers in green heads, the heads in loose to compact spikes up to 10 inches long; female flowers clustered in the axils of upper leaves. Leaves and tops collected  hen the plant is in flower. Extreme Stock Photo
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The drug plants of Illinois drugplantsofilli44teho Year: 1951 Tehon THE DRUG PLANTS OF ILLINOIS 19 AMBROSIA TRIFIDA L. Giant rag- weed, horse-weed. Compositae. — A very coarse herb up to '^ feet tall, aiuiual; stems stroiifj:, strai;^lit, branched, rough- hairy; leaves lar}j;e, opposite, petioled, ser- rate, often 10 to 12 inches wide, 3-ncrved, mostly 3-lobe(l, the lobes sharp-pointed; male flowers in green heads, the heads in loose to compact spikes up to 10 inches long; female flowers clustered in the axils of upper leaves. Leaves and tops collected hen the plant is in flower. Extreme
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The drug plants of Illinois drugplantsofilli44teho Year: 1951 Tehon THE DRUG PLANTS OF ILLINOIS 19 AMBROSIA TRIFIDA L. Giant rag- weed, horse-weed. Compositae. — A very coarse herb up to \'^ feet tall, aiuiual; stems stroiifj:, strai;^lit, branched, rough- hairy; leaves lar}j;e, opposite, petioled, ser- rate, often 10 to 12 inches wide, 3-ncrved, mostly 3-lobe(l, the lobes sharp-pointed; male flowers in green heads, the heads in loose to compact spikes up to 10 inches long; female flowers clustered in the axils of upper leaves. Leaves and tops collected \\ hen the plant is in flower. Extremely abundant along streams and roadside ditches, on over- flowed low land, and as a weed in vacant places; July to November. Has the same properties and uses as common ragweed. ANAGALLIS ARVENSIS L. Red chickweed, scarlet pimpernel. Primii- lacene.—A prostrate, spreading, smooth herb with branches 4 to 20 inches long, annual; leaves ovate, -^ inch long, oppo- site, entire, sessile; flowers red, small, wheel-shaped, solitary on slender, axillary peduncles; fruit a small, many-seeded capsule opening by a circular lid. The leaves and flowering tops collected. Introduced in Illinois; infrequent in fields and waste places, especially near large cities. Contains two glucosidal saponins and a pepsin-like substance. Used as an expecto- rant and nervine ; has been used in the treat- ment of rheumatism; poisonous. ANEMONE PATENS L. Pasque flower, headache-plant, Pulsatilla. Ra- nunculaceae.—A silky-hairy, low, stemless herb 6 to 18 inches tall; rootstock thick; leaves much divided into linear, acute lobes; flowers light bluish-purple, solitary at the tip of the flower stalks, arising from a much-divided leaf>' involucre; fruit a silky achene tipped by a plumose style. The herb collected. Occurs sparingly on gravelly hills in Winnebago and Jo Daviess counties. Yields the drug Pulsatilla; contains a volatile oil which yields the acrid principle anemonin. l^sed as an irritant, diure