A Grammatical Dictionary of Botanical Latin

-chlous,-chloa,-chloum (adj.A), ‘grass’ [> Gk. -chloe,-es (s.f.I), also -chloa,-ae (s.f.I), in Gk. comp. ‘grass;’ > Gk. A blade of grass; “the first shoot of plants (in spring) (Liddell & Scott)]; see –chloe,-es (s.f.I);

Ending in masc. –chlous [-chlo-us]: Oligosporus xanthochlous.

Ending in fem. –chloa [-chlo-a]: chilochloa, heterochloa, hydrochloa, leptochloa, limnochloa, lophochloa, macrochloa, mesochloa, psilochloa, rhiniochloa, sclerochloa, urochloa, xanthochloa

Ending in neut. –chloum [-chlo-um]: Hippeastrum mesochloum; Microstegium calochloum

NOTE: these epithets are adjectives; to determine whether they are in fact nouns in apposition instead would require individual study; e.g. Panicum echinochloa, the epithet may be a noun, the genus Echinochloa, in apposition to the generic name Panicum. A clue is the epithet is feminine, hence a noun, as it does not match the gender of the apposite genus (neuter).