Complex sentence: The describing authors state that the plant is probably not rare, but rather rarely collected due to its inconspicuous appearance when not in flower; consequently the plant is believed to be more broadly distributed than is currently known.
Split into simpler sentences: The describing authors state that the plant is probably not rare, but rather rarely collected due to it's inconspicuous appearance when not in flower. As such, the plant is believed to be more broadly distributed than is currently known.