lucky false bindweed

Calystegia felix is a semi-herbaceous perennial vine with stems up to 3 meters long, growing from shallow rhizomes and stolons. It is found in Southern California and is distinguished by its climbing or clambering growth habit, large leaves (45–122 mm long, 30–96 mm wide), and specific morphological traits such as narrowly oblong sepals (2.5–5 mm wide) and a glabrous ovary interior. It differs from Calystegia subacaulis subsp. episcopalis by its larger leaves and shorter, rounded basal lobes. It also differs from Calystegia occidentalis subsp. occidentalis by narrower sepals and corolla tube, and glabrous ovary walls. The species is part of the taxonomically complex Calystegia sepium group, which includes multiple subtaxa and related species. Morphological differences between Calystegia felix and Convolvulus arvensis are limited, with stem cross-section being a key distinguishing feature.