Plant Story--Linaria vulgaris, Butter-and-eggs, Yellow Toadflax

I grew up calling it butter-and-eggs, a pretty little plant in the meadows of New York and Ohio. 

butter-and-eggs, Linaria vulgaris, yellow toadflax

Our Built Environment

We see the world around us, but we can't see what it was. Visiting San Francisco in November, the National Park Presidio was full of informational signs about the history of the site, pointing to multiple transformations since Spain established a fort there in 1776. (Native Americans left their mark too, as mounds of discarded sea shells, which have been dated back to 740 CE).

Some changes were dramatic. This is the creek as I saw it, the drainage full of shrubs (Thompson Reach).

Stream zone that was covered, then restored

Plant Story--Shrubby Cinquefoil, Dasiphora fruticosa

The cinquefoils are easily recognized and found all around the world. There are about 400 species of cinquefoil, genus Potentilla (rose family, Rosaceae). They have five petals, like a basic rose flower, but never have thorns. The most common one in Europe had five-lobed leaves as well as five-petaled flowers, so was called cinque-foil, meaning 5-(lobed)-leaf. American species--about 98 native species!, tend to have more lobes than five, so the name carried over but doesn't fit very well.

In North America, almost all the cinquefoils/ Potentilla species are herbs, nonwoody plants. 

So I easily learned shrubby cinquefoil, Potentilla fruticosa, because it shares the flower and leaf shape, but is a shrub, the only shrubby cinquefoil in Colorado (and the U.S.) Since it was (is) so distinctive, I shouldn't have been surprised that taxonomists, revising the very big genus Potentilla, gave the shrubby cinquefoils a genus of their own; Potentilla fruticosa became Dasiphora fruticosa. The shrubby cinquefoil group, Dasiphora, is a genus of about 12 species. Only one is found wild in North America, the others are Eurasian. Since Potentilla is a very confusing group, separating out the shrubby cinquefoils made Potentilla a little more uniform (no shrubs!). 

Flowers in San Francisco

It was November and San Franisco's flowers were blooming!

California poppies, Eschscholzia californica, in a San Francisco lawn