A Grammatical Dictionary of Botanical Latin

aeternus,-a,-um (adj.A): eternal, everlasting, endless, perpetual; “without beginning or end, eternal;” see eternal;

“sempiternus denotes what is perpetual, which exists as long as time endures, and keeps even pace with it; aeternus, the eternal, that which is raised above all time, and can be mearured only by aeons (i.e. indegfinite periods... Sempiternus is rather a mathematical, aeternus a metaphysical, designation of eternity” (Lewis & Short).

- haec ad aeternam gloriam via est, this is the way to eternal [i.e. undying] glory.

- species ad 6, in uliginosis montium altiorum Andium Americae australis vigentes, usque ad limites nivium aeternarum extensae (B&H), species to 6, in the wet places of the higher mountains of the Andes of South America flourishing, extended up to the limits of perpetual snows.

- in Alpium Pyrenaeornmque scopulis nivi aeternae [dat.sg.]contiguis (DeCandolle), on the crags of the Alps and Pyrenes near to eternal snow.

- ad limites nivium aeternarum extensae, extended to the limits of perpetual snows.

- Var. B. in subalpinis et alpinis, ubi ad scaturigines atque nives aeternos cespites longe et late extensos efficit (C. Mueller), var. B. produces extensive sods far and wide in subalpine and alpine places [sc. locis] by rushing streams and eternal snows.