Conium maculatum disturbed ground. It is used as a food plant by the larvae of some Lepidoptera species, including silver-ground carpet. The poison hemlock moth ("Agonopterix alstroemeriana") feeds on the plant during its larval stage. "A. alstroemeriana" has been widely used as a biological control agent for "C. maculatum". Poison hemlock flourishes in the spring, when most other forage is gone. All plant parts are poisonous, but once the plant is dried, the poison is greatly reduced, although not gone completely. The plant is poisonous to animals that graze on it. "Conium" contains the piperidine alkaloids coniine, N-methylconiine, conhydrine, pseudoconhydrine and gamma-coniceine
Hystrix (plant) Other species placed in "Hystrix" have genomes more closely resembling those of "Leymus" species, and are better placed in that genus. Currently accepted transfers include: Hystrix (plant) Hystrix was a formerly recognized genus of grass (family Poaceae). The genus "Hystrix" was created in 1794 by Conrad Moench for the species described as "Elymus hystrix" by Carl Linnaeus in 1753. Moench considered that "E. hystrix" was sufficiently distinct to be placed in a separate genus as "Hystrix patula"; the genus was to be used for species without glumes or with long setaceous glumes. Subsequently a number of other grass species were