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Pyrethrum was a genus of several Old World plants now classified as Chrysanthemum or Tanacetum which are cultivated as ornamentals for their showy flower heads. Pyrethrum continues to be used as a common name for plants formerly included in the genus Pyrethrum. Pyrethrum is also the name of a natural insecticide made from the dried flower heads of Chrysanthemum cinerariifolium and Chrysanthemum coccineum.
The pyrethrins are a class of organic compounds normally derived from Chrysanthemum cinerariifolium that have potent insecticidal activity by targeting the nervous systems of insects. Pyrethrin naturally occurs in chrysanthemum flowers and is often considered an organic insecticide when it is not combined with piperonyl butoxide or other synthetic adjuvants. Their insecticidal and insect-repellent properties have been known and used for thousands of years.
Persian powder is an insecticide powder. It is also known as Persian pellitory and insect powder.
Parietaria officinalis, the eastern pellitory-of-the-wall, also known as upright pellitory and lichwort, is a plant of the nettle family. Its leaves, however, are non-stinging. The plant grows on rubbish and on walls, hence the name.
Parietaria judaica, with common names spreading pellitory or pellitory of the wall, is a species of herbaceous perennial plant in the family Urticaceae, commonly nicknamed sticky-weed. The plant's pollen is highly allergenic. In Australia it is also known as asthma weed, due to the high incidence of allergy. It is unrelated to the herb pellitory. It is easily confused with the very similar species Parietaria officinalis.
A sialogogue, sialagogue, ptysmagogue or ptyalagogue is a drug or substance that increases the flow rate of saliva.
British NVC community OV41 is one of the open habitat communities in the British National Vegetation Classification system. It is one of six communities of crevice, scree and spoil vegetation.
Stickyweed may refer to several plant species including:
Officinalis, or officinale, is a Medieval Latin epithet denoting substances or organisms – mainly plants – with uses in medicine and herbalism. It commonly occurs as a specific epithet - the second term of a two-part botanical name. Officinalis is used to modify masculine and feminine nouns, while officinale is used for neuter nouns.
Anthophila fabriciana, also known as the common nettle-tap, is a moth of the family Choreutidae.
Parietaria hespera is a species of flowering plant in the nettle family known by the common name rillita pellitory. It is native to the southwestern United States and northwestern Mexico, where it grows in many types of habitat, from coast to desert, dry to moist, and sometimes in disturbed areas. It is an annual herb taking an erect or spreading form up to half a meter long or forming a mat or dense tangle. The stems may branch or not. They are lined with alternately arranged leaves up to 2 centimeters long and varying in shape from oval to round or somewhat kidney-shaped. The inflorescence is a cluster of flowers emerging from the leaf axils. The flower has no petals but greenish sepals which may be tinged yellowish or reddish brown.
Parietaria pensylvanica is a species of flowering plant in the nettle family known by the common name Pennsylvania pellitory. It is native to much of North America including every province in Canada except the Maritimes and Newfoundland and Labrador, Yukon Territory, every state in the United States except Alaska and Hawaii, plus northern Mexico. It grows in many types of habitat, including disturbed areas. It is an annual herb growing decumbent or erect to a maximum height near half a meter. The alternately arranged leaves are lance-shaped or oval with a pointed tip and measure up to 9 centimeters in length. The inflorescence is a cluster of flowers emerging from the leaf axils. The flower lacks petals but it has tiny pointed reddish brown sepals.
Parietaria praetermissa, the clustered pellitory, is a plant species native to the coastal plains of the southeastern United States, i.e., Georgia, Florida, Louisiana, North Carolina and South Carolina. It grows in hammocks, waste places, calcareous outcrops, etc., at elevations of 10 m.
Parietaria floridana, common name Florida pellitory, is a plant species native to the southeastern United States, the West Indies, and much of Latin America. In the US, the heart of its range extends from Florida, to Georgia and North and South Carolina, with isolated populations reported in Mississippi, Louisiana, Texas, New Hampshire, Kentucky and Delaware. Some populations in California have in the past been referred to as P. floridana but are now regarded as a separate species, P. hespera.
