Colletia

Colletia is a genus of flowering plants in the family Rhamnaceae, with five species of spiny shrubs. All species of this genus are native to southern South America. They are non-legume nitrogen fixers.

Species
Colletia comprises the following species:


 * Colletia hystrix  Clos - pink crucifixion thorn


 * Colletia paradoxa  (Spreng.) Escal. - crucifixion thorn, thorn of the cross, anchor plant


 * Colletia spartioides  Bertero ex Colla


 * Colletia spinosissima  J.F.Gmel.


 * Colletia ulicina  Gillies & Hook.

Species names with uncertain taxonomic status
The status of the following species and hybrids is unresolved:


 * Colletia crenata  Regel (unplaced)
 * Colletia cruzerillo  Bertero (unplaced)
 * Colletia disperma  Moc. & Sessé ex DC. (unplaced)
 * Colletia horrida  Brongn. ex Drap. (unplaced)
 * Colletia velutina  Spreng. (unplaced)

Formerly placed here

 * Celtis iguanaea (Jacq.) Sarg. (as Colletia iguanaea  Scop. )
 * Discaria americana Gillies & Hook. (as Colletia longispina Hook. & Arn. and C. longissima  Steud. )
 * Retanilla stricta Hook. & Arn. (as Colletia tetrandra  Clos )
 * Retanilla trinervia (Gillies & Hook.) Hook. & Arn. (as Colletia treba  Bertero ex Colla )
 * Rhamnus diffusa Clos (as Colletia maytenoides  Griseb. )
 * Scutia spicata (Humb. & Bonpl. ex Schult.) Weberb. (as Colletia spicata  Humb. & Bonpl. ex Schult. )
 * Trevoa campanulata (Phil.) Reiche (as Colletia campanulata  Phil. )
 * Trevoa quinquenervia Gillies & Hook. (as Colletia tralhuen  Bertero ex Colla )