The relict humid forests of coastal north-central Chile occur in the regions of Coquimbo, Valparaíso and O’Higgins and are thought to be remnants of a flora that once dominated central and south Chile millions of years ago. Today, these remnant forests include (listed in order of latitude): Fray Jorge, Cerro Talinay de Huentelauquén, Fundo Caracas, Cerro de Santa Inés, areas adjacent to Zapallar, Quintay, Quebrada Cordova and Predio forestal Tanumé. These forests are isolated from continuous forest cover typically found further south along the Chilean coast. They are maintained by the continuous humidity provided by the sea fog accumulating on coastal hills and creating conditions similar to the climate found in the much rainier southern areas of Chile. Fray Jorge is the best example of a relict coastal humid forest, in this case surrounded by a mosaic of semi-desert vegetation. This UNESCO Biosphere Reserve has a tree canopy that is dominated by Aextoxicon punctatum with Drimys winteri, both of which have an extensive southern distribution extending deep into the temperate rainforests. Other species in Fray Jorge, with a southern distribution include the climbers Griselinia scandens, Mitraria coccinea and Sarmienta repens; also the ferns Asplenium dareoides and Blechnum hastatum are present.
Endemic Taxa in Relict coastal forest
- Acrisione denticulata var. pilota (Phil.) B.Nord.
- Adenopeltis serrata (W.T. Aiton) I.M. Johnst.
- Adiantum excisum Kunze
- Aristeguietia salvia (Colla) R.M.King & H.Rob.
- Azara celastrina D.Don
- Baccharis vernalis F.H.Hellwig
- Beilschmiedia miersii (Gay) Kosterm.
- Berberis actinacantha Mart. ex Schult. & Schult.f.
- Bipinnula fimbriata (Poepp.) I.M.Johnst.
- Blepharocalyx cruckshanksii (Hook. & Arn.) Nied.
- Calceolaria georgiana F.Phil.
- Calceolaria rubiginosa C.Ehrh.
- Carex dolichophylla J.R.Starr
- Chloraea bletioides Lindl.
- Chusquea cumingii Nees
- Citronella mucronata (Ruiz & Pav.) D. Don
- Cryptocarya alba (Molina) Looser
- Dioscorea bryoniifolia Poepp.
- Dioscorea humilis Bertero ex Colla ssp. humilis
- Drimys winteri var. chilensis (DC.) A.Gray
- Escallonia pulverulenta (Ruiz & Pav.) Pers. var. pulverulenta
- Escallonia revoluta (Ruiz & Pav.) Pers.
- Flourensia thurifera (Molina) DC.
- Gavilea venosa (Lam.) Garay & Ormd.
- Gayella valparadisaea (Molina) Pierre
- Griselinia scandens (Ruiz & Pav.) Taub.
- Haplopappus foliosus (Hook. & Arn.) Hook. & Arn subsp. foliosus
- Kageneckia oblonga Ruiz & Pav.
- Lapageria rosea Ruiz & Pav.
- Libertia sessiliflora (Poepp.) Skottsb.
- Lithraea caustica (Molina) Hook. & Arn.
- Loasa triloba Dombey ex Juss.
- Myrceugenia correifolia (Hook. & Arn.) O.Berg
- Myrceugenia rufa (Colla) Skottsb. ex Kausel
- Neobartsia chilensis (Benth.) Uribe-Convers & Tank
- Nolana crassulifolia Poepp.
- Nolana reichei M.O.Dillon & Arancio
- Nolana werdermannii I.M.Johnst.
- Notanthera heterophylla (Ruiz & Pav.) G. Don
- Oxalis arenaria Bertero ex Colla
- Oxalis rosea Jacq.
- Peperomia coquimbensis Skottsb.
- Peperomia fernandeziana Miq.
- Peperomia nummularioides Griseb.
- Peumus boldus Molina
- Proustia pyrifolia DC.
- Puya chilensis Molina
- Sarmienta scandens (J.D.Brandis ex Molina) Pers.
- Schinus latifolius (Gillies ex Lindl.) Engl.
- Senecio cumingii Hook. & Arn. var. cumingii
- Senecio planiflorus Kunze ex Cabrera
- Senna stipulacea (Aiton) H.S. Irwin & Barneby var. anglorum H.S. Irwin & Barneby
- Senna stipulacea (Aiton) H.S. Irwin & Barneby var. stipulacea
- Solenomelus pedunculatus (Gillies ex Hook.) Hochr.
- Stachys grandidentata Lindl.
- Tecophilaea violiflora Bertero ex Colla f. violiflora
- Triptilion cordifolium Lag. ex Lindl.
- Valeriana bridgesii Hook. & Arn.