California Native Plant Society
San Gabriel Mountains Chapter

Glendora Ridge Road, Spring 2010

See also the Glendora Ridge Road 2013 page.

This gallery page is based on three visits to Glendora Ridge Road during the spring of 2010. The first was on April 9th, when it was too early for any massive spring blossom, although there were prominent displays of some species such as baby blue eyes and grape soda lupine.

The second visit was a field trip by our CNPS chapter on May 15th. While this was close to the peak of spring bloom, an ideal time to visit this area, there were some species for which we were a little early, such as Pacific stone crop, perhaps because of spring being a few weeks later than usual. On this occasion, we traversed the 12-mile length of the road from west to east, stopping at five different locations. After lunch we walked the short Cross Trail near Mt. Baldy Village.

The third visit was on July 10, as the spring bloom was drawing to a close.

Flora lists: Click the following for:
(1) Checklist of Vascular Flora of Glendora Ridge Road (PDF 463KB) by Bob Muns (optimized for half-sized paper), and
(2) May 2010 Supplement to the Checklist (PDF 92KB) by Jane Strong

The panels: The following panels of photos are from each visit, and for the May 15 event, each of the locations where we stopped.
A. April 9: Along Glendora Ridge Road, east to west
B. May 15: Stop 1
C. May 15: Stop 2
D. May 15: Stop 3
E: May 15: Stop 4
F: May 15: Stop 5
G: May 15: Cross Trail
H. July 10: Glendora Ridge Road

Click on the thumbnails to see higher-resolution images, 720 x 480 pixels.

A. April 9, 2010: Glendora Ridge Road

It's early spring here, still with ample snow at the higher elevations of the mountains. There was no snow at the modest elevation of Glendora Ridge Road, 4,200 feet.

Looking towards Mt Wilson from eastern end of Glendora Ridge Rd

Valley below Glendora Ridge Rd

Baby blue eyes (Nemophila menziesii)


(Cardamine california var. californica)

Grape soda lupine
(Lupinus excubitus var. halli)

Mt. Baldy and Cattle Canyon

Rattlesnake Peak and Iron Mtn

Hairy ceanothus (Ceanothus oliganthus)

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B. May 15, Stop 1, at 0.2 mile from the western end of Glendora Ridge Rd

From its western end, Glendora Ridge Road gradually gains elevation, and the nature of the flowering plants gradually changes. At this time of year there are fewer flowers to see at the western end.

Prickly phlox (Leptodactylon californicum)

Chaparral currant
(Ribes malvaceum)

Miner's lettuce (Claytonia perfoliata ssp. perfoliata)

Bigleaf maple
(Acer macrophyllum)

Silver puffs
(Uropappus lindleyi)

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C. May 15, Stop 2, at 4.7 miles from the western end of Glendora Ridge Rd

This stop, like the first one, still has not reached the area where the flowers are most prolific. However, grand panoramas of the mountains to the north and west can be seen.

Looking west along
Glendora Ridge Rd.

Martin's paintbrush
(Castilleja applegatei var. martinii)

Coastal wood fern (Dryopteris arguta)

Iron Mountain and Coldwater Canyon

Deer bush
(Ceanothus integerrimus)

Pitcher sage
(Lepechinia fragrans)

Cow Cyn (foreground) to Rattlesnake Pk (far right)

Elegant rockcress (Arabis sparsiflora var. arcuata)

Oak tree (Quercus sp.) on edge of road cutting

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D. May 15, Stop 3, at 6.2 miles from the western end of Glendora Ridge Rd

California fairypoppy (Meconella californica)


Blue dicks (Dichelostemma capitatum)

Virgin's bower or Western white clematis (Clematis ligusicifolia)

Iron Mtn (L) and
Mt Baldy (R)

Golden yarrow (Eriophyllum confertiflorum)

Poison oak (Toxicodendron diversilobum)

Yellow field monkeyflower (Mimulus brevipes)

Baby blue eyes (Nemophila menziesii)

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E. May 15, Stop 4, at 8.0 miles from the western end of Glendora Ridge Rd

This stop was notable for the amount of Pacific stone crop (Sedum spathulifolium) spread across the face of the rocky cutting on the southern side of the road.

Pacific stone crop (Sedum spathulifolium)

Mt. Baldy

Sword fern (Polystichum imbricans)


Hairy leaf ceanothus (Ceanothus oliganthus)

Elegant heuchera (Heuchera elegans)

Blue larkspur (Delphinium patens)


Spearleaf mountain dandelion
(Agpseros retrorsa)

Miner's lettuce
(Claytonia perfoliata ssp. perfoliata)

California polypody (Polypodium californicum)

Martin's paintbrush
(Castilleja applegatei var. martinii)


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F. May 15, Stop 5, at 9.1 miles from the western end of Glendora Ridge Rd

Here there are plants similar to those of the previous stop with a few new discoveries such as the foothill poppy and Bolander's woodland star.

Across Cow Cyn to the mountains beyond

Foothill or collarless poppy
(Eschscholzia caespitosa)

Elelgant rockcress (Arabis sparsiflora var. arcuata) with Sara Orangetip butterfly

Child's blue-eyed Mary
(Collinsia childi)

Martin's paintbrush (Castilleja applegatei var. martinii)

Blue larkspur (Delphinium patens)


Bolander's woodland star (Lithophragma bolanderi)

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G. May 15, Cross Trail

The Cross Trail begins almost at the western end of Glendora Ridge Road, only 0.2 mile from Mt. Baldy Village, and in the middle of the steep ascent of the road away from Baldy Village. There is no signpost to indicate the trail, which is relatively short and leads to an overlook of the valley where outdoor meetings have been held — a crude amphitheater.

The final two pictures on this panel are not from the Cross Trail, but from the drive back across Glendora Ridge Road at the end of the day. The exact location was not noted.

Probably clustered broomrape
(Orobanche fasciculata)

Bishop's lotus
(Lotus strigosus)

(Salvia columbaria)

Chaparral gilia
(Gilia angelensis)

Douglas's stitchwort (Minuartia douglasii)

Woolly Indian paintbrush (Castilleja foliolosa)

Blue dicks
(Dichilostemma capitatum)

Caterpillar phacelia (Phacelia cicutaria var. hispida)

Mt Baldy Village area from Cross Trail

Grape soda lupine (Lupinus excubitus)
along Glendora Ridge Road

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H. July 10, Glendora Ridge Road, late spring

This panel of photos is from a special visit to Glendora Ridge Road to see the yellow mariposa lily. The peak of the spring bloom was over, but fortunately a few of the mariposa lily remained. It was a treat to find that the pitcher sage was in high bloom, together with a sprinkling of other flowers, some of which we had not seen during visits earlier in the spring.

Yellow mariposa lily (Calochortus clavatus var. gracilis)

Pale Chinese houses (Collinsia heterophylla)

Fragrant pitcher sage (Lepechinia fragrans)

Heartleaf penstemon (Keckiella cordifolia)

Blue stemmed keckiella
(Keckiella ternata var. ternata)

Grant's gilia (Gilia splendens ssp. grantii)

Leafy daisy
(Erigeron foliosus)

California buckwheat (Eriogonum

Wild honeysuckle
(Lonicera subspicata var. denudata)

Prickly phlox (Leptodactylon californicum)

Golden yarrow (Eriophyllum confertiflorum)

Indian pink (Silene lacaniata)

Common yarrow (Achillea millefolium)

Sticky monkeyflower (Mimulus aurantiacus)

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Thanks to Jane Strong for identification of plants and flowers.

All images © 2010-2022 Graham Bothwell.