A Grammatical Dictionary of Botanical Latin

submersus,-a,-um (part.A), “(obsol.) submersibilis,-e (adj.B)” (Lindley): submerged, growing under water or just below the surface; “buried beneath water” (Lindley); opp. emersus,-a,-um (part. A), q.v., ‘emerged, partially exposed;’ [> L. submergo,-mersi,-mersum 3., to plunge under, as in water, to sink]; for moss capsules, etc. see immersus,-a,-um (part.A), ‘immersed, submerged, imbedded;’

- herbae, nunc acaules paludosae et scapigerae rhizomate tuberoso v. repente, nunc aquaticae rhizomate repente nodoso caulibus dichotome ramosis submersis v. fluitantibus (B&H), herbs, at times stemless, of wet places and scape-bearing with a tuberous or creeping, at other times aquatic with a creeping, nodose rhizome with stems dichotomously branched, submersed or floating.

- caules plantae submersae 15-20 cm. longi, ei plantae emersae 5-10 cm. longi, stems of submerged plant 15-20 cm. long, those of emerged plant 5-10 cm. long (Stearn).

- scapus [femineus] primum erectus elongatus, per anthesin spiraliter contractus submersus, post fecundationem iterum emersum fructum maturans(B&H), the female scape at first erect, elongate, throughout anthesis spirally contracted, submerged, after fertilization the maturing fruit once more emersed [partly emergent].

- [hepatic] Kerry, in cavernis ab aqua fluitante semper impletis, ad saxa perpetue submersa (Lindb.), ‘Kerry’ [Ireland] in grottoes always full from flowing water, on stones perpetually underwater.

Rhizomes may be submerged (rhizoma submersum), i.e. growing under water;

- [NYHPHAEACEAE] herbae aquaticae, rhizomate submèrso, foliis saepissime peltatis (B&H), aquatic herbs, with the rhizome submersed, with the leaves most often peltate.