This species is similar to E. smitinandii as the scapes and the involucral bracts are hairy but it differs in having shorter and white hairs on the floral bracts; unequal male petals, one of which is exserted beyond the floral bracts; minute female sepal and glandular petals.
E. chantaranothaii is endemic to Thailand and restricted to Phitsanulok and Sakol Nakhon.
Annual herbs. Stem forming a basal disc. Leaves crowded into a basal rosette, linear, 1.5-2 cm long, 1 mm wide, hairy, apex acute. Scapes numerous, up to 23 cm long, hairy. Sheaths 2.5-3 cm long, hairy, apex acute. Capitula globose, 3-5 mm long, 4-6 mm in diameter, white. Receptacle convex, pilose. Involucral bracts broadly elliptic to oblanceolate, 1.5-2 mm long, brown, pilose, apex obtuse to acute. Floral bracts oblanceolate, 1.5 mm long, light brown, hairy in the upper part, apex acuminate. Male flowers: calyx spatheate, 3 lobed, acute, 1 mm long, brown, hairy in the upper part; petals unequal, hairy, acute, two small, the third about twice as long and exserted beyond the floral bract, subapical glands present; vestigial gynoecium present; anthers 6, black. Female flowers: sepals 1-3, narrowly linear, acute, 0.5-1 mm long, light brown, hairy in the upper part (deciduous); petals 3, unequal, elliptic or lanceolate, attenuate, acute, 1.5-2 mm long, brown, hairy in the upper part, subapical glands present; ovary 3-locular; seed 0.5 mm long, brown, glabrous
Common on sandy soils in open marshy places or on the borders of barren sandstone rocks. Altitude 120-500 m.
E. chantaranothaii had the male flower layers alternated with the female flower layers and the lowest layer was the male flowers, the average of the female-male flowers ratios per inflorescence was about 1 to 1 and the average pollen-ovule ratios was about 205 to 1.