Table 1. Rabinowitz's 7 forms of rarity based on three traits.

Geographic Range		Large		Small
Local population size		Large, dominant somewhere	Small, non-dominant	Large, dominant somewhere	Small, non-dominant
Habitat specificity	Wide	(A) Locally abundant in several habitats over a large geographic area (4)	(C) Constantly sparse in several habitats over a large geographic area (3)	(E) Locally abundant in several habitats over a small geographic area (3)	(G) Constantly sparse in several habitats over a small geographic area (2)
	Narrow	(B) Locally abundant in a specific habitat over a large geographic area (3)	(D) Constantly sparse in a specific habitat over a large geographic area (2)	(F) Locally abundant in a specific habitat over a small geographic area (2)	(H) Constantly sparse in a specific habitat over a small geographic area (1)

Letters in brackets indicate the rarity class, whereas numbers in bold in brackets indicate the ranks assigned to each rarity class. [Adapted from 52,54,99]