A Grammatical Dictionary of Botanical Latin

lacustris,-e (adj.B; lacuster, lacustris, lacustre (adj.B): inhabiting or growing in lakes.

singular plural

 
       m.          f.        n.              m.        f.          n. 
Nom. lacuster  lacustris  lacustre      lacustres   lacustres   lacustria > 
Gen. lacustris lacustris  lacustris     lacustrium  lacustrium  lacustrium 
Dat. lacustri  lacustri   lacustri      lacustribus lacustribus lacustribus 
Acc. lacustrem lacustrem  lacustre      lacustres   lacustres   lacustria 
Abl. lacustri  lacustri   lacustri      lacustribus lacustribus lacustribus 
    - herbae paludosae v. lacustres, gregariae, graciles v. robustae, interdum elatae, glaberrimae, rhizomate valido repente (B&H), plants of wet places [e.g. swamps, fens] or lacustral, gregarious, slender or robust, sometimes tall, completely hairless, with the rhizome strongly creeping.

NOTE: The nominative masculine singular in some epithets is not -er, as in classical usage, but -is, following the usage of Linnaeus: Lathyrus palustris, Lathyrus sylvestris, Ranunculus acris, Scirpus palustris, Sonchus palustris [classical Latin acer, campester, lacuster, paluster, silvester, terrester]; see Stearn 1983 p. 95..

Chrysanthemum lacustre; Matricaria lacustris; Lilaeopsis lacustris; Panicum lacustre; Ranunculus lacustris