A Mouse Tale

Vernal pool in Butte Valley Grasslands. L. Burk.
Don Burk looking for mousetails at a vernal pool in Butte Valley Grasslands. The purple is all harlequin downingia, Downingia insignis, growing out of the cracks in the dried mud. Photo taken May 28, 2023, by Laurie Burk.

I’d spent all day Saturday behind a string-trimmer, and I just couldn’t face a long hike on Sunday. So, for our weekly outing, we went for a long drive instead—in quest of mousetails!

Sessile mousetail. D. Burk.
This is a mousetail, shown in contrast with the tip of a pen. Now you see why Don is on his hands and knees in the top photo! This one is sessile mousetail, Myosurus sessilis; its key characters are that the inflorescence is shorter than the leaves, and the peduncle (flower stalk) is no more than 2 mm long. Photo taken May 28, 2023, by Don Burk, at Butte Valley Grasslands.

State CNPS has obtained funding for genetic analysis of mousetails (Myosurus spp.) to help sort out the various species, subspecies, and varieties of this diminutive member for the Buttercup Family, some of which may be rare. CNPS Associate Botanist Doug Stone had asked Chapter Rare Plant Coordinators for assistance in collecting mousetails statewide. Earlier this spring, I snagged collections in Corning, Fall River Mills, and Red Bluff, but Doug was particularly interested in collections from the Butte Valley Grasslands, near Dorris, where two species of mousetail were known to co-occur.

Mountain mousetail. D. Burk. May 28, 2023. Butte Valley Grasslands.
Mountain mousetail, Myosurus apetalus var. montanus, keys out without question. The inflorescences are longer than the leaves, the peduncles are 9 mm or longer, and mature inflorescences have a ragged appearance due to the spreading fruit beaks. Photo taken May 28, 2023, by Don Burk, at Butte Valley Grasslands.

So! With silca gel and collection baggies in hand, Laurie & I headed off to the hinterlands of northeastern Siskiyou County. At our first and only stop in the Grasslands, we waded out through sagebrush scrub, straight into a “screamin’ gorgeous” vernal pool. To our immense surprise and delight, we found not one but two, and possibly three, different mousetails! Doug Stone will be pleased!

Unknown mousetail. D. Burk.
This plant is a bit problematic. It resembles M. sessilis with leaves longer than the inflorescence, but the peduncles are up to 13 mm long. If this is M. sessilis, the keys and plant descriptions need to be revised to reflect the longer peduncle lengths. Or maybe it is a hybrid??? Hopefully the DNA analysis will answer this and other questions! Photo taken May 28, 2023, by Don Burk, at Butte Valley Grasslands.

Take a look at the slideshow, below, to see some photos that I took of a few mousetail associate species. Enjoy! ~Don Burk, Rare Plant Chair