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Botany Photo of the Day
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Eriogonum inflatum

Eriogonum inflatum
Eriogonum inflatum
Eriogonum inflatum

Today's entry is written by my UBC Botanical Garden colleague Eric La Fountaine, and also includes two of his photographs (the first two). I've added the third photograph to illustrate the inflated stems that Eric writes about, though I've long intended to get better images of this species -- maybe this spring. Eric writes:

At first, I thought this plant was a dead "skeleton" left from the last season's growth. As I approached, I was surprised to find flowers--it was late December in Anza-Borrego Desert State Park. I had no idea what plant I was looking at. Daniel later identified it from the photographs. Eriogonum are often tricky to identify; there are around 250 species and many of them are found in California (Eriogonum in the USA and Canada). Species found in Anza-Borrego Desert State Park have been inventoried, which helped narrow the range of possibilities.

Eriogonum inflatum often has inflated stems, as shown in Daniel's photograph. Initially, botanists described plants with or without inflated stems as var. inflatum and var. deflatum. A.M. Stone and C.T. Mason, Jr. (Desert Plants Vol. 1, 1979) proposed that the swollen chambers were the result of larval feeding insects and the plants were not a separate variety from non-inflated ones. Later research revealed that while the chambers are used as larders or for winter protection by insects, the inflations were also commonly found on plants without insects present (Peter W. Price, The Southwestern Naturalist, 1982). If not caused by insects, why did the plants develop these swollen stems? It was noted that the inflations are less common in drier conditions. Dr. James L. Reveal of the University of Maryland, an authority on Eriogonum (he wrote the Flora of North America treatment: Eriogonum) has addressed the riddle: the swollen chambers have a high concentration of carbon dioxide and seem to be involved in gas regulation. Possibly, the inflations give photosynthetic advantages--making more CO2 available and providing additional stem surface area to a plant that supports few leaves in the dry desert environment.

Flora of North America has an excellent description and notes on Eriogonum inflatum. Commonly known as desert trumpet, it is found at lower elevations in the southwestern USA and in Baja California and Sonora, Mexico. It's not too surprising that I found flowers on the plant, as it can flower year round. The plant in my photographs reached a good height, perhaps 50-60 cm tall, but the species can grow larger, to as much as 1.5m. Southwestern North American indigenous peoples sometimes used Eriogonum inflatum as a food source and the inflated stems were used as drinking straws or fashioned into smoking pipes, hence another common name, pipeweed.

9 Comments

Eric Hunt commented:

Wonderful desert species. It's quite common in Death Valley National Park.

Here are some more photos,

The foliage is incredibly waxy and shiny:

http://www.flickr.com/photos/ericinsf/4508167633/

It can form multiple inflated levels:

http://www.flickr.com/photos/ericinsf/4508806204/

Wendy Cutler commented:

Such an interesting plant and write-up, and great photos everyone. Thanks.

Bonnie commented:

Fascinating to this lay person. :-)

Julie commented:

We saw the dried skeletons of these flowers in western Colorado near Grand Junction, and wondered about the inflated stems. Now we know! Thank you for the information.

Tanja commented:

Beth Kempton recently published an excellent paper on the phylogeny of Eriogonum and related species:
Kempton E.A. 2012. Systematics of Eriogonoideae s.s. Systematic Botany, 37: 723-737

Daniel Mosquin commented:

Terry McIntosh sent along this photograph he took last year from Death Valley, of a dormant plant with a caldera in the background.

Kaveh commented:

Love this plant. Just saw it for the first time during a visit to Joshua Tree back at Christmas.

Lisa Mastro commented:

This has always been one of my favorite plants! Thanks for showing it.

Eric Simpson commented:

Being a frequent visitor to Anza-Borrego, this plant is an old friend. It first drew my attention because those inflated stems reminded me of the pneumatocysts on kelp. Thanks for the interesting info.

Comments are closed.

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