Filing 8 Mystery Weed

Mountain Tansymustard, photo by LGB

Mountain Tansymustard, photo by LGB

7/26/2010 Email from Linda B: “Hello all, I was weeding in the greenbelt between Mt. Harvard and LaPlatta this morning (filing 8) and came across this plant. This is a new one for me. I couldn’t find a positive ID in my copy of Weeds of the West or in the various materials from the weed district or the state.

It is hairy on the stem, has leaves almost like a potentila, the flower on close inspection is more like a pea than a mustard. If anything, on first glance, to looked to me like a close relative of flixweed (a mustard) but the flowers occur on the tip end of the branches. I counted +/- 5 on one bracket, but they are teeny-tiny. The stem is round and the seed pods look like miniature pea pods….

I will keep this one around in some water for a while if anyone wants to inspect it further. Stop by. I’ll keep it on under my large covered front deck …. My yard of wildflowers is at peak just now too if anyone wants to drive past.”

7/26/2010 Email from Linda B with Renee P’s identification: “Hi all, Renee keyed this out; it is a variety of Descurainia (like flixweed) after all. Here is what she wrote… Interesting isn’t it? Cheers. Linda”

Renee wrote: “For me the odd one keys to Descurainia incana http://www.efloras.org/florataxon.aspx?flora_id=1&taxon_id=109671

This links shows where it has been reported in co http://swbiodiversity.org/seinet/collections/list.php?type=1&taxa=Descurainia+incana&country=&state=colorado&county=&local=&upperlat=&upperlat_NS=N&bottomlat=&bottomlat_NS=N&leftlong=&leftlong_EW=W&rightlong=&rightlong_EW=W&pointlat=&pointlat_NS=N&pointlong=&pointlong_EW=W&radiustemp=&radiusunits=mi&radius=&collector=&collnum=&resetrecordcnt=1&display2.x=33&display2.y=18

Descurainia incana by Mary Ellen Harte

Descurainia incana by Mary Ellen Harte

7/29/2010 Notes from Ellen: Here is another link with lots of images from “Forestry Images” website (Forestry Images is a joint project of the Center for Invasive Species and Ecosystem Health, USDA Forest Service and International Society of Arboriculture. The University of Georgia – Warnell School of Forestry and Natural Resources and College of Agricultural and Environmental Sciences) http://www.forestryimages.org/browse/subthumb.cfm?sub=12525.

I’ve inserted one here showing flowers and fruits. Descuraina incana is not on our GVM plant list so I will add it. Thanks Renee and Linda!! Has anyone else come across this one?

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