A Grammatical Dictionary of Botanical Latin

twenty: viginti (num. adj. indecl.) 'twenty;' - flores stylis viginti praediti, the flowers provided with twenty styles.

- genitalibus quatuor ad viginti, with the sex organs from four to 20.

     viginti unus,-a,-um        unus,-a,-um et viginti  21
     viginti duo, duae, duo  duo, duae, duo et viginti  22
     viginti tres, tria          tres, tria et viginti  23 
     viginti quattuor              quattuor et viginti  24 
     viginti quinque                quinque et viginti  25 
     viginti sex                        sex et viginti  26 
     viginti septem                  septem et viginti  27 
     viginti octo                      octo et viginti  28 
     viginti novem                    novem et viginti  29

twenty-:

in L. comp. viginti-;

- folia vigintijuga, leaves 20-paired; vigintifolius, 20-leaved.

- vigintantherus, with 20 anthers.

in Gk. comp. icos-, icosa-, icosi-;

- icosandrus, with twenty stamens; icosantherus, with 20 anthers; icosaphyllus, 20-leaved

- icosahedron,-i (s.n.II), abl. sg. icosahedro, a polyhedron having 20 faces (sides)

twenty times: viciens (adv.) or vicies (adv.)

growing in twenties: viceni (adv.).