Panicle hydrangea (H. paniculata) is the most cold hardy member of the genus. It can be reliably grown in USDA cold-hardiness zones 4 to 7. Native to Asia, it grows 10 to 15 feet tall. Large creamy-white flowers, which are borne in 6- to 18-inch long panicles, are produced in mid-summer (see image at left).
Life cycle. Trichinella spiralis can live the majority of its adult life in the intestines of humans. To begin its life cycle, Trichinella spiralis adults will invade the intestinal wall of a pig, and produce larvae that invade the pig's muscles. The larval forms are encapsulated as a small cystic structure within a muscle cell of the infected host.
Unsegmented worms are generally parasitic rather than the free-living members of their phylum. Parasitic round worms include hookworms, trichinosis-causing worms, filarial worms, and eye worms. -Hookworms are serious human intestinal parasites that are found in southern United States and cause weakness and poor growth to its host. -Trichinosis is a disease caused by the roundworm Trichinella.