List of U.S. counties named after plants

=Indirectly=

*Auglaize County, Ohio: Auglaize is named for the Auglaize River, "auglaize" being a Native American word for "fallen timbers".
*Cottonwood County, Minnesota is named after the Cottonwood River, which flows through the county.
*Boise County, Idaho: Boise is named for the Boise River. "Boisé" is French for "wooded".
*Pinellas County, Florida: Pinellas is named from the Spanish words "Punta Piñal" ("Point of Pines" or "Piney Point").
* Racine County, Wisconsin: Racine is named for the Root River, "racine" being the French word for "root".
*Sunflower County, Mississippi: Sunflower is named for the Sunflower River, which was named in turn for the sunflowers that grow along its banks.
*Taos County, New Mexico: Taos is named for its county seat of Taos, New Mexico, which in turn was named for the nearby Taos Pueblo, an ancient Native American village. "Taos" is "red willow" in the Tiwa language.

Possibly

*Pembina County: Pembina is possibly named for the high-bush cranberries which grew wild in the area. Pembina may be from an Ojibwa phrase, "anepeminan sipi", referring to the berries, as they grew in abundance around the Redberry River; it may also be from an Ojibwa word meaning "meeting place". The name originally applied to the old Pembina Territory.
*Yuba County, California: Yuba is named for possibly a corruption of the Spanish word "uvas" (grapes), wild grapes having grown abundantly in the area. Alternately, it may be a Native American tribe of the Maidu people named "Yu-ba".

A

*Alameda County, California: Alameda is named for the Spanish word for an "avenue shaded by trees" or a "cottonwood grove".

B

*Box Elder County, Utah: Box Elder is named for the area's many box elders.
*Broomfield County, Colorado: Broomfield is named after the city of Broomfield, Colorado, which was named from the quantity of broom corn which was grown nearby.

C

*Camas County, Idaho: Camas is named for the local camassia plant.
* Cedar County, Missouri: Cedar is named from the many juniper trees (locally misidentified as cedars) found within its borders.
*Cedar County, Nebraska: Cedar is named for the many juniper trees (locally misidentified as cedars) in the area.
* Citrus County, Florida: Citrus is named from the county's citrus trees and the economic importance of those fruits.

F

* Forest County, Pennsylvania: Forest is named for the woodland within the county.
* Forest County, Wisconsin: Forest is named for the dense forest which once covered the county.
*Fresno County, California: Fresno is named for the Spanish word meaning "ash tree".

L

*Laurel County, Kentucky: Named for the mountain laurel shrubs prevalent in that area.
*Live Oak County, Texas: Named for a prominent live oak tree.
*Lonoke County, Arkansas: Lonoke is named for a "lone oak" tree that stood on the site of the present county seat and was used as a local landmark.

O

*Orange County, California: Orange is named for Orange, California, which in turn was named for the orange groves which were once plentiful in the area.
* Orange County, Florida: Orange is named after the orange fruit, the main product in the early county. Formerly known as Mosquito County.

P

*Palm Beach County, Florida: Palm Beach is named from the palm trees and beaches in the county.
*Panola County, Mississippi: Panola is a Native American word meaning "cotton".
*Panola County, Texas: same as the Mississippi county
*Pine County, Minnesota: Pine is named after the giant forests of eastern white pine and red (Norway) pine that flourish in the county.
*Pontotoc County, Oklahoma: "Pontotoc" is a Chickasaw word meaning "cat tails growing on the prairie".

*Sweet Grass County, Montana: Sweet Grass is named for the abundant sweet grass in the county.

T

*Tulare County, California: Tulare is named for the Spanish word for place of "tules" or rushes, aka cattails.

W

*Wheatland County, Montana: Wheatland is named for the many wheat fields found within its borders.
*White Pine County, Nevada: White Pine is named for the numerous limber pine (a form of white pine) stands in the area.