Rare Plant Conference, Rare Plant List, and Working Groups

Save the Date:  Our 31st Rare Plant Conference is Feb. 28 – Mar. 2, 2023 at the Idaho Dept. of Fish and Game. Nampa, Idaho.

The Idaho Native Plant Society’s Rare Plant Conference is usually conducted every other year as a three day, in-person conference where issues related to Idaho’s flora are discussed and Idaho’s rare plants are ranked to determine their protection requirements.

Registration is OPEN!

You can register and pay for the conference with this: online form. We are using PayPal to process online payments, or alternatively you have the option to pay via postal mail. If paying by mail, please print out and send the snail mail registration form with your payment. The address to send it to is on form.


Our last conference, in 2022, was online Monday, February 28, – Tuesday, March 1, 2022.  The agenda along with handouts and species accounts can be found below for RPC 2022.

Handouts from the 2022 Conference:
Northern Idaho Rare Plant Working Group Species Accounts:

Botrychium hesperium Species Account NIRPWG 2020-01-12                                           Calliergonella cuspidata Species Account 2022-01-18                                                                            Carex lacustris Species Acct 2022-01-18                                                                                                 Carex limosa Species Account 2021-12-14                                                                                              Carex sychnocephala Species Acct 2022-01-18                                                                                    Carex tenera Species Account 2022-02-18                   Carex_podocarpa_Species_Account_2021-01-12                                                                      Cryptogramma stelleri Species Account 2021-01-12                                                                                Eleocharis mamillata ssp. mamillata Species Acct 2021-02-10                                                          Elymus hirsutus Species Acct 2021-01-12                                                                                                            Mitella trifida Species Acct 2022-02-10                                                                                                                Monarda fistulosa var. menthifolia Species Acct                                                                Muhlenbergia racemosa Species Account 2022-02-16                                                        Porotrichum bigelovii Species Acct 2021-02-10                                                                                    Silene spaldingii Species Account 2022-01-18                                                                            Sphagnum platyphyllum Species Acct 2021-02-10

Southern Idaho Rare Plant Working Group Species Accounts:

Aliciella_triodon_update_20211230
Ammannia robusta_Species_Account_20201209
Astragalus mollissimus var. thompsoniae_Sp_Accnt_20220217
Carex_fuliginosa_Species_Account_20210205
Carex_holmgreniorum_Sp_Acnt_2022_02_24
Carex_vernacula_Species_Account_20210116
Montia_parvifolia_v_batholithica_Sp_Acct_20220217
Orthocarpus holmgreniorum_Sp_Accnt_2022_02_23
Phacelia scopulina Sp_Accnt 2022_02_17
Pogogyne serpylloides-Sp Acnt 2022_02_17
Pyrrocoma_racemosa_paniculata_Sp_Account_20220201
Solidago nana_Sp_Accnt_2022_02_21
Townsendia_scapigera_Sp_Account_20220201


The 29th Rare Plant Conference was February 25-27, 2020
sponsored by the Idaho Native Plant Society
led by co-chairs: Anne Halford and Jennifer Miller
Theme: Conservation in Idaho and Beyond
Featured rare plant: CYPRIPEDIUM PARVIFLORUM VAR. PUBESCENS


The Idaho Rare Plant Conference (RPC) is generally held every other year, and is organized by INPS along with various agencies (such as Bureau of Land Management, Idaho Department of Fish and Game, US Fish and Wildlife Service, Forest Service, etc.), academics, consultants, and others interested in Idaho’s rare plants.

It is an opportunity to learn about rare plants, share information, and network with others of similar interests.

Updating the INPS Rare Plant List, based on new information, is a substantial portion of the RPC. In addition, there are usually a number of talks/presentations on rare plants, conservation issues, or related topics. Dinners (either banquet or informal gatherings) along with conference breaks and poster session offer opportunities to renew or make new botanical acquaintances. Sometimes a field trip has been part of the RPC.

Rare Plant List and INPS Rare Plant Working Groups

Updating the

Idaho Rare Plant List

begins with the

Rare Plant Working Groups.

Past Conferences and Keynote Speakers

  • 2018—Salmon R. Mountains penstemon, Penstemon salmonensis
  • 2016—Packard’s milkvetch, Astragalus cusickii var. packardiae, was our highlighted species.
  • 2014—Barbara Ertter, Consumers’ Guide to On-line Floristic Data—2014_RPC_Agenda
  • 2011—No Keynote Speaker, Focus on Rare Plant List Update—RPC2011_Agenda
  • 2009 — Del Wiens, Plant Associations of Africa
  • 2007 — George Wuerthner, WILDFIRE A Century of Failed Forest Policy
  • 2006 — Bob Moseley, Plant Conservation in the Tibetan Borderlands
  • 2005 — Bruce Welch, Countering Misinformation Concerning Big Sagebrush