Herbs annual. Roots fibrous, slender, less than 0.3 mm in diam., glabrous or tomentose. Rhizomes absent. Stems numerous, diffuse, creeping proximally, simple or branched, 10--50 cm, glabrous. Leaves nearly all cauline, sometimes 1 or 2 basal; leaf sheath mostly less than 10 mm, hirsute throughout, sometimes glabrous except for a hirsute line along mouth slit; leaf blade linear or lanceolate, 2.5--10 × 0.5--1 cm, glabrous or sparsely hispid on both surfaces, apex obtuse or acuminate. Cincinni several, in terminal panicles, or solitary, with several densely arranged flowers; peduncle slender, to 4 cm; proximal involucral bracts leaflike but smaller than leaves, distal ones less than 10 mm; bracts caducous; pedicels slender, straight, 3--5 mm. Sepals ovate-elliptic, ca. 3 mm. Petals purple, obovate-orbicular. Fertile stamens 2; filaments bearded proximally; staminodes 2--4; antherodes 3-sect. Capsule ovoid-globose, trigonous, 3--4 mm. Seeds 2 per valve, yellow-brown, deeply pitted, or shallowly pitted and radiate white verrucose. Fl. and fr. (Jun--)Aug--Sep(--Oct).
Herbs, annual, unbranched to much branched, 8--30 cm. Leaves spirally arranged; blade linear or linear-lanceolate to lanceolate-oblong, 1.5--7(--18) ´ 0.3--0.8 cm. Inflorescences terminal or terminal and axillary; cymes few-flowered, solitary or fascicled, long-pedunculate; bracteoles caducous, scars spaced less than 2 mm apart. Flowers bisexual, slightly bilaterally symmetric, 4--6 mm wide; sepals 2--3 mm; petals pinkish purple or violet, 3--3.5(--6) mm; fertile stamens 2; filaments bearded; staminodes 4. Capsules 2.5--5 mm. Seeds 2 per locule, deeply pitted, 1.3--1.8 mm. 2n = 20 (Trinidad).
"Procumbent herbs; rooting at lower nodes. Leaves sessile, 6-11 x 0.5-1.2 cm, linear or linear-lanceolate, base rounded, apex acute or acuminate; sheath to 1.2 cm long, margin ciliate. Flowers in terminal and axillary few-flowered, subglobose or subcorymbose panicles. Sepals c. 2 mm long, oblong, obtuse. Petals 2-2.5 mm long, oblong, acute, bluish-purple. Staminal filaments bearded; staminodes 3 with filaments bearded or not. Ovules 2 in each cell. Capsule 2.5-3.7 mm across, globose. Seeds 2- per locule, c.1 mm, cuboid, deeply pitted."
Isotype for Callisia parvula Brandegee Catalog Number: US 1206960 Collection: Smithsonian Institution, National Museum of Natural History, Department of Botany Verification Degree: Original publication and alleged type specimen examined Preparation: Pressed specimen Collector(s): C. A. Purpus Year Collected: 1923 Locality: Near Jalisco., Chiapas, Mexico, North America
Isotype: Brandegee, T. S. 1924. Univ. Calif. Publ. Bot. 10: 403.
Wet places by water, rarely among grass; low elevations (to 1500 m in Yunnan). C Anhui (Shucheng Xian), Fujian, Guangdong, Guangxi, S Henan (Tongbai Xian), WC Hunan (Xuefeng Shan), N and S Jiangsu, Jiangxi, C and E Shandong (Laoshan Xian, Tai Shan), C Sichuan (Emei Shan, Guanghan Xian), S and W Yunnan [Bhutan, Cambodia, India, Indonesia, Japan, Laos, Malaysia, Myanmar, New Guinea, Philippines, Sikkim, Sri Lanka; Indian Ocean and Pacific Islands].