Mosquito (Culex quinquefasciatus)

the Musquetors has been So troublesom day and night Since our arrival in this Vally that we are tormented very much by them and Cant' write except under our Bears.
William Clark

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Blood engorged mosquito on a human finger

Culex quinquefasciatus lives mainly in the southeast of the United States.

Photo created by the U.S. Center for Disease Control.

Thin-leaved Owl-clover
(Orthocarpus tenuifolius)

Valley of Clarks R.
Meriwether Lewis

Lewis collected a specimen on this date. This quotation is from the herbarium.

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Flower with a large purple head

Photo created by the U.S. Forest Service.

Wormleaf Stonecrop
(Sedum stenopetalum)

Valley of Clarks R.
On the naked rocks on the KoosKoosKee
Meriwether Lewis

Lewis collected a specimen on this date. These two quotations are from the herbarium.

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Flower with thick yellow petals

Photo ©2004 Kurt Stüber. Permission via the GNU Free Documentation License.

Smallhead Clover
(Trifolium microcephalum)
Largehead clover
(Trifolium macrocephalum)

I found two speceis of native clover here, the one with a very narrow small leaf and a pale red flower, the other nearly as luxouriant as our red clover with a white flower the left and blume of the latter are proportionably large.
Meriwether Lewis

Learn more about the Smallhead clover:
Wikipedia | Wikimedia Commons


Learn more about the Largehead clover:
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Small, low clovers next to a single clover with a large head

Smallhead clover photo: July 25, 2011 in the Bitterroot valley.

Largehead clover photo taken at Colgate Licks on Lolo Pass on June 30, 2009.

Mountain Lady's-slipper
(Cypripedium montanum)

Capt L. Showed me a plant in blume which is Sometimes called the ladies Slipper or Mockerson flower. it is in shape and appearance like ours only that the corolla is white marked with Small veigns of pale red longitudinally on the inner Side, and much Smaller.
William Clark

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Three-leaved plant with a white shoe-shaped petal

Photo created by Gordon Leppig & Andrea J. Pickart of the U.S. Fish and Wildlife Service.