According to V. H. Heywood (1993), I. Friis (1993), W. T. Wang Procris langbianensis Gagnep and Procris rhizantha Gagnep) distributed in many provinces as Laocai, Langson, Hanoi, Thanhhoa. Ninhbinh, Ninhthuan, Lamdong. Genus procris has some characteristics: Herbs perennial, subshrubs. Stems often succulent. Leaves apparently altemate, distichous; nanophylls often present, very small, opposite to developed leaves; stipules intrapetiolar, undivided; pinnately veined, base asymmetric, margin usually entire or serrulate; cystoliths linear. Inflorescences axillary, sometimes at leafless nodes, of unisexual flowers (plants monoecious or dioecious); male glomerules in lax cymes; female capitula, subsessile. Male flowers: perianth lobes 4 or 5, segments often valvate; stamens 4 or 5; filaments inflexed in bud; rudimentary ovary globose or obovoid. Female flowers: perianth lobes 3 or 4, very small, boat-shaped, free or connate at base; staminodes absent. Ovary straight; stigma sessile, penicillate, soon disappearing. Achene ovoid or ellipsoid.