It is usually found in endophyte-infected species of grass like Tall fescue[1] or Perennial Ryegrass.

[2] It is toxic to cattle feeding on infected grass, probably because it acts as a vasoconstrictor.

[1][3] Morning glory: Argyreia nervosa (Hawaiian Baby Woodrose), Ipomoea spp.

(Morning Glory, Tlitliltzin, Badoh Negro), Rivea corymbosa (Coaxihuitl, Ololiúqui)

This drug article relating to the cardiovascular system is a stub.