Description from Flora of China
Haplanthoides H. W. Li; Haplanthus Nees.
Herbs or subshrubs, with cystoliths. Leaf blade margin entire. Inflorescences terminal or axillary, panicles, racemes, or sometimes spikes or dense clusters; bracts present; bracteoles small [or absent]. Calyx deeply 5-lobed; lobes narrow, equal or subequal. Corolla tubular to funnelform at base; limb 2-liped; lower lip 3-lobed; upper lip entire or 2-lobed; lobes ascending cochlear in bud. Stamens 2, exserted from or included in corolla tube; filaments sometimes pubescent; anthers 2-thecous; thecae parallel, equal or subequal, base muticous and conspicuously pubescent. Capsule linear-oblong or ellipsoid, compressed perpendicular to septum, [6-]12-20-seeded; retinacula present. Seeds subglobose, ± blocky, or ± compressed, surfaces smooth or ornamented, lacking trichomes.
About 20 species: tropical and subtropical Asia; two species (one introduced) in China.
(Authors: Hu Jiaqi (胡嘉琪 Hu Chia-chi), Deng Yunfei (邓云飞); Thomas F. Daniel)