tarweed


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tarweed

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In an experiment using a minirhizotron camera, stinkwort (left) root growth was tracked over time and compared to the root growth of yellow starthistle and the native virgate tarweed.
Botanists believe that silverswords (Argyroxiphium sandwicense macrocephalum) evolved here over millions of years from the wind-borne seeds of the tarweed, a California native with sunflower-like blooms.
For example, last year researchers reported genetic evidence that the silversword - a dramatic Hawaiian plant with gray-green, saber-like leaves - evolved from the homely california tarweed, probably borne to Hawaii tens of thousands of years ago as a seed in the features or gut of a bird (SN:4/27/91, p.
They depended o-n wild plants that grew in open prairie, such as camas, tarweed and yampah.
You could plant grapes, or even olive trees, where the star thistle is, but not where the tarweed is.
Sticky appendages on tarweed fruit may have allowed the plant to hitch a ride with a winged traveler.
Aside from the pools, Yahi's attractions include a remarkable number of brodiaea species-plus lupines, clarkias, foothill and ftying-pan poppies, Chinese houses, bird's-eye gilia, shooting stars, delphinium, lomatium, and tarweed, as well as buttercup, monkey flower, and linanthus species.