Question: Illicium and Lithophragma, are native to which mutual continent?

Context paragraphs:
Lithophragma campanulatum: Lithophragma campanulatum is a species of flowering plant in the saxifrage family known by the common name Siskiyou Mountain woodland star.  It is native to southern Oregon and northern California, where it grows in the forests and woods of the mountains.  It is a rhizomatous perennial herb growing erect or leaning with a tall naked flowering stem.  The leaves are mostly located on the lower part of the stem, each divided into rounded lobes, sometimes narrowed into teeth.  The stem bears 2 to 11 flowers, each in a cuplike calyx of red or green sepals.  The five petals are white, under one centimeter long, and divided into irregular toothlike lobes.

Lithophragma parviflorum: Lithophragma parviflorum is a species of flowering plant in the saxifrage family known by the common name smallflower woodland star.  It is native to much of western North America from British Columbia to California to South Dakota and Nebraska, where it grows in several types of open habitat.  It is a rhizomatous perennial herb growing erect or leaning with a naked flowering stem.  The leaves are mainly located low on the stem, each cut into three lobes or divided into three lobed leaflets.  The stem bears up to 14 flowers, each in a cuplike calyx of red or green sepals.  The five petals are bright white, up to 1.6 centimeters long, and usually divided into three toothlike lobes.

Illicium: Illicium is a genus of flowering plants treated as part of the family Schisandraceae, or alternately as the sole genus of the Illiciaceae.  It has a disjunct distribution, with most species native to eastern Asia and several in parts of North America, including the southeastern United States, Mexico, and the Caribbean.  General common names include star anise and anisetree.  The genus name comes from the Latin "illicere" ("to allure").

Illicium tenuifolium: Illicium tenuifolium is a species of flowering plant in the family Schisandraceae, or alternately, the Illiciaceae.  It is a tree native to Peninsular Malaysia and adjacent Peninsular Thailand.  It grows in forest habitat, such as cloud forest.

Illicium verum: Illicium verum is a medium-sized evergreen tree native to northeast Vietnam and southwest China.  A spice commonly called star anise, staranise, star anise seed, Chinese star anise, or badiam that closely resembles anise in flavor is obtained from the star-shaped pericarp of the fruit of "Illicium verum" which are harvested just before ripening.  Star anise oil is a highly fragrant oil used in cooking, perfumery, soaps, toothpastes, mouthwashes, and skin creams.  About 90% of the world's star anise crop is used for extraction of shikimic acid, a chemical intermediate used in the synthesis of oseltamivir.

Illicium ternstroemioides: Illicium ternstroemioides is a species of tree in the family Schisandraceae, or alternately, the Illiciaceae.  It is native to northern Vietnam and Hainan Island in China.

Lithophragma affine: Lithophragma affine is a species of flowering plant in the saxifrage family known by the common name San Francisco woodland star.  It is native to the coast of western North America from Oregon to Baja California, where it grows in open habitat on mountain slopes, hills, and canyonsides.  It is a rhizomatous perennial herb growing erect or leaning with a tall naked flowering stem.  The leaves are located on the lower part of the stem, each divided into sharp-pointed lobes.  The stem bears up to 15 widely spaced flowers, each in a cuplike calyx of red or green sepals.  The five petals are bright white, up to 1.3 centimeters long, and divided into three toothlike lobes at the tips.

Skimmia: Skimmia is a genus of four species of evergreen shrubs and small trees in the Rue family, Rutaceae, all native to warm temperate regions of Asia.  The leaves are clustered at the ends of the shoots, simple, lanceolate, 6-21 cm long and 2-5 cm broad, with a smooth margin.  The flowers are in dense panicle clusters, each flower small, 6-15 mm diameter, with 4-7 petals.  The fruit is red to black, 6-12 mm diameter, a fleshy drupe containing a single seed.  All parts of the plant have a pungent aroma when crushed.  The botanical name, "Skimmia", is a Latinization of "shikimi" (シキミ, 樒), which is the Japanese name for "Illicium religiosum" as well as an element in "miyama shikimi" (ミヤマシキミ, 深山樒), the Japanese name for "Skimmia japonica".

Lithophragma: Lithophragma is a genus of flowering plants containing about nine species native to western North America.  These plants are known generally as woodland stars.  The petals of the flowers are usually bright white with deep, long lobes or teeth.  Each petal may look like three to five petals, when at closer inspection the lobes fuse into a single petal at its base.  Most species reproduce via bulblets instead of seeds.  "L. maximum" is a federally listed endangered species.

Lithophragma heterophyllum: Lithophragma heterophyllum is a species of flowering plant in the saxifrage family known by the common name hillside woodland star.  It is native to the coastal mountain ranges of California, where it can generally be found in shady habitat.  It is a rhizomatous perennial herb growing erect or leaning with a slender naked flowering stem.  The leaves are located on the lower part of the stem, each divided into rounded lobes.  The stem bears 3 to 12 flowers, each in a cuplike calyx of red or green sepals.  The five petals are white, up to 1.2 centimeters long, and usually divided into about three pointed lobes.

Supporting paragraphs: Illicium Lithophragma
Answer: North America