A number of years ago Alberto Castillo donated to the BX what he called a double flowered form of Oxalis compressa. I expect that is where Jim got it. You can see photos here: http://pacificbulbsociety.org/pbswiki/index.php/… The leaves look a lot like Oxalis pes-caprae and the bulbs of this double form are a little different from the single form as my photos show. I found it was a lot less likely to flower than O. pes-caprae and worried about it so got rid of it, but there was some that got loose in one of the pots in my raised bed that I haven't unpotted. No flowers this year however, but the single form has been a blaze of bright yellow flowers for months. When the double form flowers, it flowers much earlier than Oxalis pes-caprae. There are supposed to be double forms of O. pes-caprae. Gastil and Nhu took some photos for the wiki that show the bulbs and the contractile roots and show how it can rapidly increase. http://pacificbulbsociety.org/pbswiki/index.php/… Cape Plants describes O. compressa as like O. pes-caprae, but petioles flattened and peduncles 3-6 flowered versus 3 to 20 in O. pes-caprae. And Christiaan van Schalkwyk added this distinction to the wiki: Oxalis compressa can be identified by the flattened or compressed leaf stalks. Oxalis pes-caprae has a brown bulb, without conspicuous longitudinal grooves. It may or may not have a stem. The bulbs I photographed of the double form of O. compressa had the grooves. Fremontia, the journal of the California Native Plant Society has a double issue I recently received devoted to California Geophytes. I've really been enjoying reading all the articles. If I find time I may write about it in another post. I can't remember which article it was in, but one of them minimized the problem of O. pes-caprae except in disturbed places. But it is in state parks on the bluffs and spreading to other places in Northern California. It appears in a new places I guess as Kipp says because the birds spread the bulbs. The leaves when young look a lot like clover and so when it first appears without flowers it isn't noticeable. Then a year or two later when you see the flowers you find out you are in trouble. It is flowering in abundance at the moment in this wet year. Mary Sue On 3/28/2017 9:14 PM, Kipp McMichael wrote: > I assume this is Oxalis pes-caprae (which has been corrupted to "compress"?)