question: Are Hemigraphis and Alternanthera plants in the family Acanthaceae?
answer: yes
context: Title: Alternanthera
  Passage: Alternanthera is a genus of flowering plants in the amaranth family, Amaranthaceae.  It is a widespread genus with most species occurring in the tropical Americas, and others in Asia, Africa, and Australia.  Plants of the genus may be known generally as joyweeds, or Joseph's coat.  Several species are notorious noxious weeds.
  Title: Barleria prionitis
  Passage: Barleria prionitis (Sanskrit "kuranta"; Marathi "vjradanti" (वज्रदंती), Tamil: சுள்ளி மலர் ; Tagalog: "kukong manok"), also known as the porcupine flower, is a species of plants in the family Acanthaceae, native to India, Sri Lanka and Eastern Southern and Central Africa.
  Title: Tetramerium
  Passage: Tetramerium is a genus of plants belonging to the family Acanthaceae.  It is found mainly in the Americas, especially in tropical dry forests.  Christian Gottfried Daniel Nees von Esenbeck first described the genus in 1846 after collecting two species ("T. polystachyum" and "T. nervosum") on the journey of the HMS Sulphur.
  Title: Hemigraphis
  Passage: Hemigraphis is a genus of plants in the family Acanthaceae, consisting of about 30 species native to tropical Asia.  "Hemigraphis" is sometimes included in the genus "Strobilanthes"
  Title: Hemigraphis repanda
  Passage: Hemigraphis repanda is a species of plant of family Acanthaceae.
citations: Hemigraphis Alternanthera