Grinnell Ridge is about 1-1/2 miles north of South Fork Meadows, along the Lost Creek Trail which runs from the South Fork Trail 5.3 miles to South Fork Campground on SR 38. The trail first crosses the headwaters of the Santa Ana River and then switchbacks easily up to the ridge at an elevation of about 8100'. Grinnell Ridge overlooks Poopout Hill.

Columbia cutleaf
Hymenopappus filifolius var. lugens
Asteraceae

Ashy gray paintbrush
Castilleja cinerea
Scrophulariaceae

Mountain snowberry
Symphoricarpos rotundifolius var. parishii
Caprifoliaceae

Hoary-aster
Machaeranthera canescens var. canescens
Asteraceae

Wheeler's cinquefoil
Potentilla wheeleri
Rosaceae

San Gabriel beardtongue
Penstemon labrosus
Scrophulariaceae

Brewer's fleabane
Erigeron breweri
Asteraceae

Bigelow's sneezeweed
Helenium bigelovii
Asteraceae

Fir mistletoe
Phoradendron pauciflorum
Viscaceae

California-aster
Lessingia filaginifolia var. filaginifolia
Asteraceae

Parish's yampah
Perideridia parishii ssp. parishii
Apiaceae

Tiling's monkeyflower
Mimulus tilingii
Scrophulariaceae

Yarrow
Achillea millefolium
Asteraceae

White catchfly
Silene verecunda ssp. platyota
Caryophyllaceae

Arrowleaf butterweed
Senecio triangularis
Asteraceae

Corn lily
Veratrum californicum var. californicum
Liliaceae

Meadow starwort
Stellaria longipes var. longipes
Caryophyllaceae