Description from Flora of China
Commelina spirata Linnaeus, Mant. Pl. 2: 176. 1771; Aneilema melanostictum Hance; A. nanum Kunth.
Herbs perennial. Roots fibrous. Rhizomes horizontal, elongate, 1--1.5 mm in diam., with sheaths at nodes; internodes to 4 cm, densely yellow hirsute in a line. Stems slender, as thick as rhizomes, creeping proximally, ascending distally, simple or branched, to 35 cm; internodes 1.5--4.5 cm, densely hirsute in a line. Leaf sheaths ca. 5 mm, densely hirsute in a line along mouth slit; leaf blade narrowly ovate to lanceolate, 1.5--3.5 × 0.5--1 cm, glabrous on both surfaces, base truncate, slightly clasping, margin undulate, apex obtuse or acute. Cincinni 1--4, forming terminal panicles, glabrous throughout; peduncle with an infertile, membranous involucral bract above middle; apical involucral bract sheathlike, proximal 1 or 2 involucral bracts similar to leaves in shape, membranous, if only 2 cincinni present then involucral bracts usually absent, if only 1 cincinnus present then cincinni filiform, to 7 cm; bracts very small; pedicels elongate, to 7 mm in fruit. Sepals elliptic, 3--4 mm, persistent. Petals pale blue or nearly white, obovate-orbicular. Fertile stamens 3; filaments lanate; staminodes 3; antherodes 3-sect. Capsule oblong, trigonous, 3--4 mm (excluding apiculus), obtuse at both ends, apiculate at apex. Seeds 3--7 per valve, uniseriate, gray-white, verrucose. Fl. Jan--Dec. 2 n = 40.
Forests, humid wastelands, sandy places by streams; near sea level to 1000 m. S Fujian (Xiamen Shi), S Guangdong (Enping Xian), Hainan, Taiwan, W Yunnan (Zhenkang Xian) [Bhutan, India, Indonesia, Laos, Malaysia, Myanmar, Philippines, Sri Lanka, Vietnam; Pacific Islands (Samoa)].