San Diego County biodiversity

A March visit to San Diego's desert

On the other side of the mountains from coastal San Diego lies the Sonoran Desert, an ecoregion that spans multiple states in two countries. As Earth’s most biologically diverse desert, its intrinsic and aesthetic value is immeasurable.

ocotillo sunrise-Fouquieria splendens

ccotillos (Fouquieria splendens) at dawn

ghost flower-Mohavea confertiflora

ghost flower (Mohavea confertiflora)

Mimulus bigelovii-Bigelow's monkeyflower

Bigelow's monkeyflower (Mimulus bigelovii)

California barrel cactus-Ferocactus cylindraceus

This California barrel cactus (Ferocactus cylindraceus) is beautiful even in death.

gander's cholla-Cylindropuntia ganderi

Gander's cholla (Cylindropuntia ganderi) backlit at dawn

costa's hummingbird-Calypte costae-Larrea tridentata-creosote bush

A male Costa's hummingbird (Calypte costae) perched on a creosote bush (Larrea tridentata)

As with many areas of the desert where human activity has disturbed the cryptobiotic crusts, invasive, highly flammable grasses and other weeds from overseas have set up shop in Galleta Meadows. It’s an impressive sculpture park that gets a lot of foot traffic—and car traffic despite the signs asking people to park along the road and walk a bit. There is, or was, a particularly grand desert lily I make a point of visiting there and it was nowhere to be found this spring. Its emergence may have been impacted by the mechanical method used to clear weeds from around the creosote shrubs; it shredded desert lily leaves and unearthed the bulbs of very young plants that were still close to the surface (they sink lower as the plants mature). I wish I'd documented the tiny, unearthed bulbs before frantically replanting them as best I could with my hands, but it didn’t cross my mind in the moment.

desert lily-Hesperocallis undulata

Desert lilies (Hesperocallis undulata) have a fragrance that matches the beauty of their blossoms and leaves. The leaf damage is apparent here.

desert lily-Hesperocallis undulata

This is the mature desert lily I was unable to find this year.

A male phainopepla (Phainopepla nitens)

Queen butterfly-Danaus gilippus-Funastrum heterophyllum

A queen butterfly (Danaus gilippus) working Hartweg's climbing milkweed (Funastrum heterophyllum)

Coquillettapis bee in Sphaeralcea ambigua

This Coquillettapis sp. bee was curled up for the evening in a desert globemallow (Sphaeralcea ambigua) blossom.

dune scorpion-Smeringurus mesaensis

dune scorpion (Smeringurus mesaensis)

desert bighorn sheep-Ovis canadensis ssp. nelsoni

There are eight desert bighorn sheep (Ovis canadensis ssp. nelsoni), including two lambs, blending into the pale rocks here. I heard them charging up the mountain before I saw them.

After talking to the rangers about doing so, I set up my camera trap to see who might visit the spring running through the campground during our stay. This coyote walked off with an early morning snack of what was most likely a Baja California treefrog. I hope to “catch” a fox here someday.

Desert Star Rise-landscape painting-Anza-Borrego Desert State Park

Robin Street-Morris. Desert Star Rise. Transparent watercolor and soft pastel on 300lb cold press paper. 14" x 19" (36 x 48cm).