A Grammatical Dictionary of Botanical Latin

juvenile, immature, not yet fully developed; see young; also may mean ‘early; earlier;’ opp. vetus, gen.sg. veteris, q.v., ‘old;’ compar. junior,-ius (adj.B ); cf. adult, immature;

- in statu juveni, when young (in the youthful state).

- foliola juvenilia pubescentia, vetera glabra, leaflets young pubescent, old, glabrous.

- synonymon junius est Jungermannia reclusa Tayl., saltem p. p. (Lindberg), an earlier synonym is Jungermannia reclusa Tayl., at least in part.

NOTE: as a noun: juvenis,-is (s. m/f III), nom. & acc. pl. juvenes: “one who is in the flower of his or her age (mostly of persons older than adolescentes and younger than seniores, i.e. between twenty and forty years), a young person, a young man, a young woman” (Lewis & Short).

comparative:

           singular                 plural 
        m\f       n             m/f          n

Nom.  junior    junius       juniores     juniora 
Gen.     junioris                  juniorum 
Acc. juniorem   junius       juniores     juniora 
Dat.      juniori                  junioribus 
Abl.      juniore                   junioribus

- in thallis juvenioribus, in younger thalli.

- capsula pleiosperma, juniore ovata (F. Mueller), the capsule with more [than usual] seeds, the younger ovate.

- folia in ramulis junioribus conferta, the leaves on the younger branchlets congested..

- fructus junior secretione candida obtectus, et antherarum pressione spiraliter sulcatus (B&H), younger fruit covered with a white secretion, and by the pressure of the anthers spirally grooved.

- sepalis concavis florem juniorem saepius includentibus (DeCandolle), with the sepals concave, more often enclosing the younger flower.

- charactere ex alabastris juvenilibus, petalis nondum evolutis sumpto(B&H), by the character taken from the young buds, with the petals not yet developed.

- MARQUARTIA, videtur Millettia nitida, Benth., staminibus in alabastro nimis juvenili examinatis, perperam liberie dictis (B&H), Marquartia seems [to be] Millettia nitida, Benth., by the stamens examined in a too juvenile bud, falsely said [to be] free [i.e. not fused].

- cono masculo oblongo-cylindraceo fere pedali, juvenili lana fusca vestito (F. Mueller), the male cone oblong-cylindric, almost a foot long, the juvenile one covered with a brown wool.

- folia ad nodos et ramulos juveniles numerosissima (F. Mueller), the leaves at the nodes and juvenile branchlets very numerous.

- elatior, foliis denique recurvo-patentibus junioribus angustolanceolatis, adultis ovato-lanceolatis omnibus sensim longe acutatis diu persistentibus (F. Mueller), taller, with the leaves ultimately recurved-spreading, the younger narrowly lanceolate, the adult ovate-lanceolate, all of them gradually long acutate, long persisting.

- ramis juvenibus sericeis, with young branches sericeous.

Juvenis,-is (s.c.III), abl. sg. juvene: one in the prime of life.