A Grammatical Dictionary of Botanical Latin

deorsum (adv.): downward, downwards (from above), downwardly, below; opp. sursum (adv.), q.v., ‘upwards; upward from below;’ see direction;

- antherae valvulis deorsum dehiscentes, anthers by valvules downward from above dehiscing.

- capsula deorsum alata, capsule winged downward.

- spadix deorsum florens, the spadix flowering downwardly from above.

- caulis deorsum subattenuatus, stem attenuate downwardly.

- antherae subsessiles, extrorsum et deorsum loculos antherarum longitudinaliter dehiscentes gerentes (DeCandolle), the anthers subsessile bearing the locules of the anthers facing outsard and downward longitudinally dehiscing.

- clava distincta, alba, item recta, fistulosa , elongata, deorsum cylindrica , sursum subulata (S&A), the club [fruiting structure] separate, white, also straight, hollow, elongate, downwardly cylindric, upwards subulate.

- stipes albidus, deorsum plus minusve incrassatus (S&A), the stipe whitish, downwardly more or less thickened.

- sepalis basi solutis seu ultra insertionem deorsum longe productis (DeCandolle), with the sepals freed at the base or long-extended downwardly beyond the insertion.

- primo unicolor, dein sensim deorsum nigrescit, sursum nitorem smaragdinum conservat (S&A), at first it is of one color, then, gradually it grows dark downwards, upwards it preserves an emerald-green gloss.

- pinnis in apice deorsum curvis, with pinnae in the apex curved downwardly.

deorsum, “downwards; as deorsum hamulosus = bordered with hooks directed downwards; i.e. towards the base of the leaf” (after Lindley ‘seorsum’).

NOTE: in combination with other adverbs:

- deorsum versus, downwards (from above); see versum (adv.).

- sursum deorsum, up and down, to and fro.