Common Names: Asiatic dayflower, yazhicao, tsuyukusa
Sub-category: Dayflower family
An annual herb with stems that are typically decumbent, but some individuals may be simply erect. The diffusely branched stems tend to root at the basal nodes. The pubescence on the stems is variable, but common patterns include a line of hair continuous with the leaf sheath, or they may be glabrous basally, meaning hairless, and puberulent towards the extremities, that is covered with fine hairs. The leaves are sessile or they may be subpetiolate. The leaf sheaths are cylindrical, sometimes striped with red, and typically glabrous, but usually have margins that are puberulent or pilose. The leaf blades range from narrowly lanceolate, or lance-shaped, to ovate-elliptic, between egg-shaped and ellipse-shaped. They measure 3 to 12 cm by 1 to 4 cm wide. The blades range from glabrous to puberulent and have scabrescent, or slightly rough, margins. Their tips are acute to acuminate. The leaf bases are oblique, or uneven.
The blue flowers are arranged on inflorescences called cincinni, which are also called scorpioid cymes. This is a form of a monochasium where the lateral branches arise alternately. The cincinni are subtended by a spathe, a modified leaf. The solitary spathes usually measure 1.2 to 3 cm long, but some may be up to 3.5 cm in length, while they are 0.8 to 1.3 cm tall, but sometimes up to 1.8 cm. The uncurved spathes typically have a cordate, or heart-shaped, whitish base, which contrasts with its dark green veins. Their margins lack hairs, are somewhat scabrous, or rough, and are unfused. Their apices are acute to acuminate while the surfaces are glabrous, puberulent, or hirsute-ciliate. The spathes are borne on peduncles, or stalks, that measure 0.8 to 3.5 cm and sometimes up to 5 cm long.
Found in shady forest edges, wet areas of crop fields, orchards, ditches, and roadsides.
Primary Flower Color: Blue/Purple
Secondary Flower Color: White