It’s a datura, but is moonflower, NOT the more poisonous (and utterly useless) Jimsonweed. Note the smooth oval leaves—true Jimsonweed has SPIKED-shaped leaves with uneven lobes. Plus, Jimsonweed has a purplish tint to the flowers. Finally, Jimsonweed seeds are black. Regular moonflower seeds are a light to medium brown. Ok to plant/handle–but since it’s in the same family as nightshade DO NOT EAT. Lovely fragrance when flowers open a night–my mother had a moonflower plant in her garden for years. Some grow upright (like my mother’s did) and some only as vines–this looks like the upright type. Just didn’t want you to confuse it with Jimsonweed-https://en.wikipedia.org/wiki/Datura_stramonium

Information for Datura genus. https://en.wikipedia.org/wiki/Datura

Maybe some thing in the nightshade (Solanaceae) family, looks like a species in the Jimsonweed/thorn-apple Datura genus (?). I can’t tell for certain which species this is. Check out the included link below for Datura inoxia. If this isn’t Datura, make new post with photo of fruit. Best wishes! http://plants.hicksnurseries.com/12170001/Plant/10209/Thorn_Apple