Jake on Miner's Lettuce
23 February 2008 - 17:01, Tinman said
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Periodically we’re going to showcase here musings by Jake Sigg, dean of the San Francisco native plant community. Here are his comments about a common native plant, miner’s lettuce, shown in this photo from Edgehill Mt:
and in this even more spectacular view from Edgehill Mt
Jake says:
Miner’s lettuce, Claytonia perfoliata, is a native annual herb that is common in disturbed, often shady areas. It is a cheerful light green, and it holds its clusters of tiny white flowers above a saucer-like leaf that completely surrounds the supporting stem. All the plant’s succulent and juicy parts are edible, and were used by native peoples and European settlers for salad. They would put the plants on ant nests, the ants would walk all over them, and the formic acid on ants’ feet — used to establish their trails — provided a slightly vinegary dressing.
The plant has been abundant at least up until now, and you find them as waifs in vacant lots, waste areas, in gardens, roadsides, and parks, providing charm, beauty, and variety to otherwise drab areas. But miner’s lettuce may be less abundant in the future, as its favored habitats are being usurped by weeds, in particular yellow oxalis, Oxalis pes-caprae, and ehrharta, Ehrharta erecta, an aggressive perennial grass. Both plants are from South Africa and they lack the natural agents which keep them under control in their native range, whereas the native plants must share their energy with the food chain-an unequal contest. I have been seeing patches of miner’s lettuce disappearing under the onslaught of these invaders, and it is only a matter of time before it will disappear entirely, save where human intervention maintains little refuges.
How ironic for such a common, ubiquitous, weedy plant.
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