A Grammatical Dictionary of Botanical Latin

-merus,-a,-um (adj.A), -mericus,-a,-um (adj.A): ‘-merous,’ in Gk. comp. referring to parts or their number; “having parts; as 2-merous, having two parts of each kind” (Fernald 1950) [> Gk. meros, share]; see -divided;

- dimerus, q.v., with two parts or two members of a given part or whorl.

- DICRANOSTIGMA a Stylophoro non differt nisi gynoecio dimero neo 3—1-mero (B&H), Dicranostigma does not differ from Stylophorum except by the dimerous gynoecium not 3-1-merous.

- trimerus (3-merus), with three parts or three members of a given part or whorl; = ternatus,-a,-um (adj.A): ternate, in threes, consisting of threes, as a leaf divided into three leaflets.

- heteromerus, heteromericus, with parts not corresponding in number; leptomerus, with slender, small or delicate parts; leucomerus, with white parts.

- homomerus or isomerus, having members of successive whorls the same in number.

- isomerous, with equal parts, i.e. with the number of parts in one floral whorl the same as in another whorl: isomericus,-a,-um (adj.A), isomerus,-a,-um (adj.A); anisomerous, with unequal parts, anisomericus,-a,-um (adj.A), anisomerus,-a,-um (adj.A).

- leptomerus, with slender parts (Stearn).

- zygomeris,-e (adj.B): with parts joined in pairs [> Gk. zygo-: joined, yoked], declined like -formis-e.

- corolla pentamera, lobis tubum aequantibus, corolla in five parts, with the lobes equalling the tube.

- species floribus certissime 4-meris, species with the flowers most definitely 4-parted.

NOTE: not L. merus,-a,-um (adj.A), see below.

anisomerus,-a,-um (adj.A): anisomerous, “when the parts of a flower are unequal in number. The same as ‘unsymmetrical’” (Lindley).

Trillium erectum forma polymerum (with several members; of the cycles of petals or tepals); Trillium grandiflorum forma polymerum (with many members, or more cycles of the flower); forma dimerum (in twos, with sepals, leaves, etc. 2 each).