Benghal dayflower (tropical spiderwort, wandering Jew)
Commelina benghalensis (Commelina obscura, Commelina uncata)

Presence of leaf hairs—Dayflower species possess a thick, waxy, leaf that lacks hairs (glabrous). Benghal dayflower, on the other hand, will often produce hairs on the young leaves and petioles.
Flower color—The flower color of many dayflower species is blue, while benghal dayflower is more purple/lavender.
Root structure—Unlike all other dayflower species, benghal dayflower produces underground flowers. These flowers are easily seen by examining the roots. These flowers will appear as “swollen nodes.