A Grammatical Dictionary of Botanical Latin

decussatus,-a,-um (adj.A): decussate, i.e. in pairs that alternately cross each other at right angles, thus making four rows; marked with lines intersecting cross-wise; derived from decussis, 'the number ten,' hence 'the crosswise intersection of two lines like the Roman numeral X.' (Stearn); “divided crosswise, in pairs alternately at right angles (Jackson); cf. spiral;

- dispositione foveolarum floralium decussata non spirali, with the arrangement of the floral pits decussate not spiral. STEARN?

- sepala 2-6, rarius oo, valde imbricata v. per paria decussata, nunc bractearum paribus nonnullis decussatis extus stipata (B&H), sepals 2-6, more rarely [indeterminate], strongly imbricate or decussate in pairs, sometimes with some pairs of bracts decussate, [the sepals] the outer ones stiped.

- folia opposita, saepius decussata, rarius verticillata; petala 4—5, decussata v. imbricata (B&H), leaves opposite, more often decussate, more rarely verticillate; the petals 4-5, decussate or imbricate.

- petala rarius per paria decussata et rarissime 4 subvalvata (B&H), the petals more rarely decussate in pairs and very rarely somewhat 4-valvate.

- sepala lateralia subherbacea, linearía, sub labello patentia v. deflexa, longe parallela v. decussata.(B&H), the lateral sepals subherbaceous, linear spreading below the labellum or deflexed, long-parallel or decussate.