34. Petrocodon Hance, J. Bot. 21: 167. 1883.
石山苣苔属 shi shan ju tai shu
Herbs, perennial, terrestrial or epipetric, rhizomatous, stemless. Leaves few, basal; leaf blade strigose, base cuneate. Inflorescences umbel-like, dense, axillary, few- to many-flowered cymes; bracts 2, opposite. Calyx actinomorphic, 5-sect from base; segments equal. Corolla white, zygomorphic, inside glabrous; tube suburceolate-tubular, not swollen, longer than limb, 1-2.5 mm in diam.; limb indistinctly 2-lipped; adaxial lip 2-lobed, slightly shorter than abaxial lip; abaxial lip 3-lobed, lobes equal, apex acute. Stamens 2, adnate to abaxial side of corolla tube slightly above base, included; anthers dorsifixed, coherent apically, thecae divaricate, confluent at apex, dehiscing longitudinally; connective not projecting; staminodes 1-3, adnate to adaxial side of corolla tube. Disc ringlike. Ovary linear, 1-loculed; placentas 2, parietal, projecting inward, 2-cleft. Stigma 1, terminal, nearly globose, undivided. Capsule straight in relation to pedicel, linear, much surpassing calyx, dehiscing loculicidally to base; valves 2, straight, not twisted. Seeds unappendaged.
* One species: endemic to China.