A Grammatical Dictionary of Botanical Latin

tu: you (Eng.): the singular of the second personal pronoun (the plural being ‘vos,’ q.v.,‘you’); this pronoun refers to the persons (people) addressed by the speaker;

        singular 
Nom. tu       (you) 
Gen. tui      (of you) 
Dat. tibi     (to/for you) 
Acc. te       (you) 
Abl. te       (by/with/from you)

- Mougeot et Nestler muscorum Vogesiacorum te compotes fecerunt, Mougeot and Nestler made you (sg.) [intellectual] masters of the mosses of [the Vogesian Mountains] [i.e. by the issuance of an exsiccate from this area]; tu = acc. sg.

- [fungi] sphaerulae parvae, fragiliuscula, vetustiorum paucae dimidiatae: ostiolum vix ullum, ni passim rudimentum eius aliquod videre tibi videaris (S&A), the sphaerules are small, somewhat more fragile, a few of the older ones halved: there is scarcely any ostiole, except that here and there you may think to yourself to see some vestige of it; tibi = dat. sg.

- semina in exemplaribus te visa subrotunda, the seeds in samples seen by you subrotund.

- in omnibus a te examinatis speciminibus, in all specimens examined by you (sg.).

Note: the genitive tui is not used to indicate possession. ‘Your’ is indicated using the possessive pronominal adjectives tuus(m.), tua(f.), tuum (n.) (adj.A), q.v.

a. tui was used as partitive genitive (‘genitive of the whole’):

- magna pars tui, a great part of you.

b. tui (gen.sg.) is used as an objective genitive:

- timor tui, fear of you.

- caritate tui pro nobis, with the affection of you for us.

Note: the nominatives of the personal pronouns were only used to stress the subject(s), otherwise, they were omitted and the pronoun is understood by the verbal endings: -as, -es, etc.;

- tu putas numerus specierum Rutacearum parvior quam Rosacearum, you (yourself) consider the number of species of the Rutaceae smaller than of the Rosaceae. ‘tu’ may be deleted and the subject is understood by the form of the verb ‘putas’, ‘you (sg.) consider.’

- in speciminibus Valerianae saliuncae tu examinas, in the specimens of Valeriana saliunca you yourself examined.