A Grammatical Dictionary of Botanical Latin

semel (num. adv.): once, a single time, of a single occurrence; cf. bis (adv.) twice, two times; cf. ter (adv.): thrice, three times; see ‘times;’ cf. aliquoties (adv.), aliquotiens (adv.), several times; at different times; cf. multoties (adv.): many times;

- non semel sed bis vel ter, not once but twice or three times.

- semel atque iterum, once and again.

- semel aut iterum, only once or twice, i.e. not very often.

- plus semel, more than once.

- non semel sed bis, not once, but twice.

- ramis semel aut bis dichotomis, with branches once or twice dichotomous (Stearn).

- (adverbial expressions:) semel, a single time, semper, all the time, simul, at the same time.

- nonnisi semel inventus fungus nobis rarus in lignis vetustis fabrefactis pineis dolii in terra defossi (S&A), a fungus found by us only once in the old worked wood of a barrel buried in the earth.

- non semel sed saepe, not just once, but frequently [i.e. often].

- semel et saepius, more often than once, time and time again, often.

- pedunculi saepissime in ramos 2-6, semel v. repetite 2-3-chotomos v. umbellatos divisi, peduncles most often divided on branches 2-6, once or repeatedly 2-3-forked or umbellate.

- inflorescentia semel ramosa, the inflorescence once branched.

- marginibus ubique recurvis vel semel revolutis tenus prope apicem, with the margins throughout recurved or once revolute up to near the apex.

- hactenus nonnisi semel inventus in fruticetis frondosis umbrosis, ineunte Septembri (S&A), thus far only once encountered in shady, leafy [i.e. deciduous] thickets, at the onset of September.