Adjective : a congeneric investment company.    From Dictionary.com. 

It might be defined likewise an effect, not having its cause in any thing congenerous.    From Wordnik.com.  [Literary Remains, Volume 1] Reference

Man had never been exactly a mystery to her, but now she felt for the first time the congenerous creature — and she gave in to him.    From Wordnik.com.  [Gänsemännchen. English] Reference

If I admire when I see how much congenerous birds love to congregate, I am the more struck when I see incongruous ones in such strict amity.    From Wordnik.com.  [The Natural History of Selborne, Vol. 1] Reference

How diversified are the modes of life, not only of incongruous, but even of congenerous animals; and yet their specific distinctions are not more various than their propensities.    From Wordnik.com.  [The Natural History of Selborne, Vol. 2] Reference

You may follow the adventures of a letter through any passage that has particularly pleased you; find it, perhaps, denied a while, to tantalise the ear; find it fired again at you in a whole broadside; or find it pass into congenerous sounds, one liquid or labial melting away into another.    From Wordnik.com.  [Essays in the Art of Writing] Reference

We know the Doric mood sounds gravity and sobriety; the Lydian, buxomness and freedom; the Æolic, sweet stillness and quiet composure; the Phrygian, jollity and youthful levity; the Ionic is a stiller of storms and disturbances arising from passion; and why may we not reasonably suppose, that those whose speech naturally runs into the notes peculiar to any of these moods, are likewise in nature hereunto congenerous?.    From Wordnik.com.  [Curiosities of Literature, Vol. 1 (of 3)] Reference

Dear Sir, -- Your observation that "the cuckoo does not deposit its egg indiscriminately in the nest of the first bird that comes in its way, but probably looks out a nurse in some degree congenerous with whom to intrust its young," is perfectly new to me, and struck me so forcibly that I naturally fell into a train of thought that led me to consider whether the fact was so, and what reason there was for it.    From Wordnik.com.  [The Natural History of Selborne, Vol. 1] Reference

Again, where the food of the young depends on where the mother places her eggs, as in the case of the caterpillars of the cabbage-butterfly, we may suppose that the parent stock of the species deposited her eggs sometimes on one kind and sometimes on another of congenerous plants (as some species now do), and if the cabbage suited the caterpillars better than any other plant, the caterpillars of those butterflies, which had chosen the cabbage, would be most plentifully reared, and would produce butterflies more apt to lay their eggs on the cabbage than on the other congenerous plants.    From Wordnik.com.  [The Foundations of the Origin of Species Two Essays written in 1842 and 1844] Reference