Annual sunflower grown for silage and for its seeds which are a source of oil; common throughout United States and much of North America.
1Seeds of Helianthus annuus and of two species of Ipomoea (those of 'I.
2Helianthus annuus (Compositae).-Theupper part of the hypocotyl moved during the day-timein the course shown in the annexed figure (Fig.