Description from Flora of China
Oldenlandia pinifolia (Wallich ex G. Don) K. Schumann.
Herbs, annual or perennial, diffusely branched, to 25 cm tall; stems wiry, sharply 4-angled to subterete, sometimes sulcate, glabrous. Leaves sessile or subsessile, sometimes borne on very short axillary stems and appearing verticillate or clustered; blade drying stiffly papery to leathery, linear to narrowly spatulate, 5-25 × 0.8-2 mm, adaxially glabrous to densely scaberulous, abaxially glabrous, base straight to acute, margins markedly revolute at least when dry, apex acute; secondary veins not visible; stipules shortly fused to petiole bases, triangular to rounded, 0.8-1.2 mm, puberulent to glabrous, with 1-5 linear lobes or bristles 0.5-2.5 mm. Inflorescences terminal and pseudoaxillary on short axillary stems, capitate to shortly fasciculate, 4-7 mm in diam., (1 or)3-10-flowered, sessile and subtended by 1 or 2 pairs of somewhat reduced leaves; bracts lanceolate to setose, 0.5-4 mm, entire to ciliate; pedicels to 1 mm. Flowers sessile, subsessile, or pedicellate, apparently homostylous. Calyx with hypanthium portion obconical to subglobose, 0.8-1.2 mm, glabrous to densely hispidulous; limb lobed for more than 1/2; lobes subulate to narrowly triangular, 1-2 mm, glabrescent, entire to densely ciliolate. Corolla white sometimes flushed with pink, tubular to funnelform, outside glabrous; tube 3-4.2 mm, pubescent in throat; lobes spatulate-oblong to elliptic, 1.8-2 mm. Anthers exserted, ca. 1 mm. Stigma 0.5-1 mm, exserted and positioned above anthers. Fruit capsular, ovoid to lanceoloid, 2.5-3 × 1.5-2 mm, cartilaginous to stiff, loculicidal across top; seeds several to numerous, pale brown, angled. Fl. May-Nov, fr. Apr-Nov.
The plant illustrated in FRPS (71(1): 70, t. 13, f. 1-6. 1999) as "Hedyotis umbellata" is actually H. pinifolia. The Fl. Bhutan (2(2): 763-764. 1999) included this species noting that the report is based on a published historical record that has not been re-confirmed.
Open fields on hills, sandy wastelands at seasides or riversides; sea level to below 100 m. Fujian, Guangdong, Guangxi, Hainan, Taiwan, Yunnan [India, Malaysia, Myanmar, Nepal, Thailand, Vietnam].