There are actually two different sets of answers. The first is from the book, "Laelias of Mexico"...
Laelia albida: 24-43 in / 600-1100 mm
Laelia anceps: 47-83 in / 1200-2100 mm
Laelia aurea: 35-79 in / 900-2000 mm
Laelia autumnalis: 28-51 in / 700-1300 mm
Laelia eyermaniana: 31-43.3 in / 800-1100 mm
Laelia furfuracea: 28-39 in / 700-1000 mm
Laelia gouldiana: < 20 in / 500 mm
Laelia rubescens: 26-91 in / 650-2300 mm
Laelia speciosa: 28-39 in / 700-1000 mm
Laelia superbiens: 47-71 in / 1200-1800 mm
the second is from the
Orchid Culture website...
Laelia albida: 19 in / 483 mm
Laelia anceps: 35 in / 889 mm
Laelia aurea: 26 in / 660 mm
Laelia autumnalis: 18 in / 457 mm
Laelia eyermaniana: 40 in / 1016 mm
Laelia furfuracea: 27 in / 686 mm
Laelia gouldiana: 11 in / 279 mm
Laelia rubescens: 34 in / 864 mm
Laelia speciosa: 14 in / 356 mm
Laelia superbiens: 26 in / 660 mm
*phew*, converting the unit measurements took way too long.
As you can see, the quantity of water received is significantly lower from the Orchid Culture website. Not sure which one is more accurate.
From a cursory glance, based on the Orchid Culture website, the Brazilian Laelias receive roughly twice as much water as the Mexican Laelias do...which is still a little under or right around as much water as the typical lawn here in Southern California.
My main point is that many yards here in So Cal currently receive sufficient water to satisfy the water requirements of quite a few epiphytic orchids. It's really just a matter of somehow redirecting sprinklers to apply water to trunks and branches of trees where orchids are mounted and/or suspending mounted orchids where they will be in the path of sprinklers.
Here's a chart based on the data from the Orchid Culture website to help visualize the differences in quantity of water received.
