SEARCH HINT for RARITY
Unless you know exactly what RARITY value that the plant might have, then it is best to leave the RARITY set to [Unspecified].
(The RARITY level is mainly an informational parameter rather than one on which to base a search). This is because the rarity rating of plants can change; they either become more numerous, or usually, less numerous and therefore rarer.
Alternatively, if you really would like to know which plants the Author thinks have, for instance, a 'Rare' rarity rating, then click on rarity?rare and a list will be produced.