The paper deals with seed morphometry of 10 orchid species from (15372.8 um" Manipur. Volume wise, the seeds were largest in Cymbidium iridioides x 10) and smallest in Taeniophyllum glandulosum (159.35 1m3 x 103). The embryo measured the maximum in Paphiopedilum hirsutissimum (3069,.3 jm" x 10) and minimum in Taeniophyllum glandulosum (82.4 um3x 10). The air cavity accounted for 90.5% seed volume in Cymbrdum iridioides and onily 4.9% in Aerides odorata. The air cavity adds to the buoyancy of seeds, and seems to infiuence the distribution range in dif ferent species.