Giliastrum is a genus of flowering plants belonging to the family Polemoniaceae.
Its native range is Central USA (found in the states of Arizona, Colorado, Kansas, New Mexico, Oklahoma and Texas) to Dominican Republic, Mexico and north-western Argentina.
The genus name of Giliastrum is in honour of Filippo Luigi Gilii (1756–1821), an Italian clergyman, naturalist and astronomer who worked in part in the Vatican City, and it was first described and published in Fl. Rocky Mts. on page 699 in 1917.
Known species, according to Kew; Giliastrum acerosum Giliastrum castellanosii Giliastrum foetidum Giliastrum gypsophilum Giliastrum incisum Giliastrum insigne Giliastrum ludens Giliastrum purpusii Giliastrum rigidulum Giliastrum stewartii