Dayflower is among a small number of plants introduced from Asia. This annual has fleshy, succulent branches that creep and spread by rooting at the nodes. Leaves are long, narrow and pointed with parallel veins. Their stems wrap around the main branches and form sheaths. The plant gets its name from the unusual fact that each flower lasts only one day. Flowers are an attractive blue with three petals. The two upper petals are rounded and much larger than the lower. Dayflower thrives and spreads in moist shady places. It grows from the New England states south to Florida and westward to Kansas and Texas.