Current Bloom Reports

©Arie Korporaal

©Arie Korporaal

The wildflower season is upon us in the Borrego Valley. We’ve opened up our Current Bloom Reports section of this website and are pleased to feature Kate Harper’s 2018-19 Season Wildflower Bloom Analysis and Prediction. Kate gives an overview of why we are entering a “Bursting-with-Blooms “Spring.”

You too can have your bloom reports published on the Botany Society web site. Send them in and we will get them formatted and uploaded for all to see. Send your bloom reports to

Oberbauer to Discuss the 2017 Wildflower Superbloom

Tom Oberbauer, President, California Native plant society–San Diego Chapter

Tom Oberbauer, President, California Native plant society–San Diego Chapter

Tom Oberbauer, President of the San Diego Chapter of the California Native Plant Society, will be the February speaker as part of the Botany Society’s Public Lecture Series. He will discuss The 2017 Superbloom on Monday, February 11, 2019.

Tom Oberbauer is a third generation San Diegan. He has had a life-long interest in natural resources of San Diego County and Baja California, particularly islands. He received his bachelor and master’s degrees in biology from San Diego State.

Tom is fascinated by ephemeral natural phenomena such as wildflower displays and vernal pools. He has been observing spring wildflower displays in the Anza Borrego area since he was a child and has strong recollection of the good years in the late 1970’s, early 1980’s, and the mid 1990’s. The 2016-2017 rainfall season was above average for San Diego County, but not extraordinarily so, However, the timing of the rain and temperatures provided a unique situation for wildflower growth. The cover and diversity of wildflowers in the spring 2017, so-called superbloom, was equal to or greater than those of the majority of seasons in the past 30 years.

Tom spent a number of days exploring the wildflowers and sheets of color across the landscape through the season as well as exploring the hills and Palm Canyon. Tom is happy to present his photographs of this outstanding wildflower season. 

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Who: Tom Oberbauer, President, San Diego Chapter, California Native Plant Society
Topic: The 2017 Superbloom
Where: Discovery Lab, Visitor Center, Anza-Borrego Desert State Park
When: Monday, February 11, 2019
Time: 10:00 to 11:30 AM
Cost: Free lecture; public is invited. There is a $10 Park Day Use Fee

The Botany Society Celebrates Tenth Birthday

By Joanne Ingwall, Immediate Past President 

Last February, we presented the first in a series of essays looking back and celebrating 10 years of history and accomplishments of the ABDSP Botany Society. That article reported on the goals of the Society and the activities put in place in the first year to achieve them. This second retrospective will focus on two parts of our mission: education through field work and building a scientifically useful herbarium

There is no better way to learn about plants than to see them in their native habitat, watching them germinate, grow, flower and fruit. Throughout our 10-year history, a high priority for new and seasoned Botany Society members is to do just that. San Diego County contains one of the most diverse flora on the continent, and ABDSP encompasses many plant habitats ranging from the desert floor to the montane, offering rich opportunities to learn. Here are a few of the Botany Society’s accomplishments in field work. 

  • In the first year of the Botany Society, volunteers became trained participants of the San Diego Plant Atlas project of the San Diego Natural History Museum (the NAT). The Plant Atlas aims to describe all native and naturalized plants in the County. This information documents our region's unique natural history and biodiversity, and provides valuable scientific data showing how it is evolving. These trained volunteers routinely survey one or more sectors within the Park (3 x 3 mile squares) and collect plants not only for the NAT herbarium but also for our CDD herbarium. The goal is to collect a representative of each plant that exists in that sector. Many hundreds of plant specimens have been collected; one is sent to the NAT for identification and another is entered into the CDD herbarium. Even though the Plant Atlas Project is coming to an end, many Botany Society members still monitor their sectors. Most notable of them is Mary Jo Churchwell, who logs in many hundreds of hours each year monitoring several sectors. 

  • The Botany Certification Course held every year heavily relies on field trips for educating new Botany Society members. Our theme might well be summarized by the questions: What do you see? What else do you see? The field trips led by botanists Kate Harper and Larry Hendrickson are the most popular classes. Not only are they fun, they are scientifically valuable. On one of the very first field trips in the first year of the Society, Diana Lindsey found a species in the Clark Dry Lake Area that was new to the Park: Eriastrum sparsiflorum subspecies Harwoodii (according to Sarah Degroot).

  • Botany Volunteer Pat Matthews is our weed warrior. For many years now, Pat has led a group of volunteers dedicated to eradicating the two worst invasive plants in the Valley: Sahara Mustard (Brassica tournefortii) and Volutaria. An invasive plant is one which outcompetes native plants, thereby altering the composition of plant communities and, often, leading to the eradication of native plants. The scientific, economic and even cultural benefits of this field work are enormous.

  • The CDD has an herbarium—the collection of the plants that exist within the CDD parks. Our Herbarium is part of a network of herbaria designed to share information about the flora of the region. Botany Society members have contributed to the Herbarium in many ways.

    • First, they collect (using proper protocols) representative plants in the field.

    • Second, they process the plants for preservation: drying, debugging (put in a freezer – really!) and then mounting (gluing) them onto sheets. The sheets show whole plants (if possible), their parts, their provenance, their identification and when and who found it. Over the past 10 years, thousands of hours have been spent by Botany.

    •  Society volunteers mounting specimens in the Botany Lab: Kathy Bussey, Laura Webb, Ruth Ehly, Ruth Otis, Heidi Addison, Sonja MacGrath, Martha Ellul, Mary Jo Churchwell and Claire Burwell are among those on the “mounting” team. Volunteers even built the workbenches! 

    • Third, volunteers enter the scientific data (what it is and where it was found) into the CDD data bank so that it can be used by scientists. A major accomplishment of Botany Society volunteer Birgit Knorr, aided by data base expert Linda Gilbert on loan from the Paleo Society, has been to create a useful database and to enter and update the records describing the flora of our Park....more than 5500 different plants. This has been an enormous undertaking!

To say that field work is the foundation of the work of the Botany Society (indeed, of all our Societies) may be an understatement. To be effective in the field, Botany Society volunteers must learn plant morphology, plant ecology and the characteristics of the plant families comprising the diverse plant communities that exist in our Park … that will be the topic of the next installment describing our first 10 years.

The Latest from Pam's Amble

On Friday, December 14th, Pam's Amble explored the wash leading to Truckhaven Rocks. Amblers were richly rewarded!

Right by the road we were greeted by glowing pink desert sand verbena (Abronia villosa). Then, not only were the usual suspects--lavender (Hyptis emoryi), creosote (Larrea tridentata), and burro bush (Ambrosia dumosa)--in bloom, but indigo bushes vied to paint the wash, well, more indigo, and a rush milkweed (Asclepias subulata) sported cream-colored blossoms.

On a smaller scale, we also saw blooming wishbone bushes (Mirabilis bigelovii), brown-eyed evening primroses (Chylismia claviformis), and even one each of an eye-popping yellow poppy (probably Eschscholzia californica, given the size of the unfurling bud) and more demure ground cherry (Physalis crassifolia).

Also exciting were the vast number of healthy lupine seedlings--the wash should be awash with blue-purple in the not too distant future.

Happy botanizing, Pam

Indigo Bush ( Psorothamnus emoryi  ) ©Pam Blake

Indigo Bush (Psorothamnus emoryi ) ©Pam Blake

Burrobush  (Ambrosia dumosa)  ©Pam Blake

Burrobush (Ambrosia dumosa) ©Pam Blake

October Showers Bring December Flowers 

© Arie Korporaal

© Arie Korporaal

In mid-October monsoonal rain fell in two distinct locations in the Anza-Borrego Desert. One area was the Borrego Badlands. The other was along S-2 between Whale Peak and the Mountain Palm Spring area. Both areas received about 1. 5 inches in one day, and both now have lots of germination of annuals and even some flowering. Botany Society members have recently hiked both of these areas to see what's coming up. 

In the badlands the ocotillo (Fouquieria splendors) leafed out extravagantly. Many desert lilies (Hesperocallis undulata) are also showing their leaves. A couple of them were even in bloom, which is remarkable for December. A few hairy desert-sunflowers (Gerea canescens) have opened up. Most remarkable was the number of barrel cactus (Ferocactus cylindraceus) with buds and flowers. Emerging annuals include Arizona lupine (Lupinus arizonicus), Thomas' buckwheat (Eriogonum thomasii), and California caltrop (Kallstroemia californica). The caltrop is a monsoonal annual that only comes up in response to summer or early fall rainstorms. Dune evening primrose (Oenothera deltoides) is just starting to bloom. Perhaps the most uncommon plant we saw in bloom was Long-beak streptanthella (Streptanthella longirostris), a dune inhabitant. 

The south end of the park was equally florific. The most frequently seen plant was Brown-eyed primrose (Chylismia claviformis peirsonii) which is blooming by the thousands in June Wash. Devil's Claw (Proboscidea althaeifolia), another monsoonal annual, was abundant in Canyon 41 and Canebrake Canyon. It had both flowers and fruit in early December. Indigo Bushes (Psorothamnus schottiiwere covered with deep blue flowers especially in the late afternoon. A few Orcutt's woody asters (Xylorhiza orcuttii) were seen in June Wash, but not yet in flower. The most unusual and surprising find in this area was a hybrid brittle bush, a cross between Encelia farinosa and Encelia frutescens. At at distance the plant appears to be a normal brittle bush, but closer examination reveals that the leaves and flowers are somewhere between the two parents. Three of these hybrid plants were observed in June Wash.

The bottom line is that there are plenty of plants to see if one goes to the places where rain has fallen. However, the condition of plants changes rapidly with the weather, so don't delay. Get out there and see what's blooming.

Note: Image links are to images on the iNaturalist Web site posted by Don Rideout.