Plants Collected or Reported by
Merriwether Lewis and William Clark

Alphabetical List of Plants Found in Idaho


American bistort (Polygonum bistortoides)
Jim Ford Creek, Weippe Prairie, 12 June 1806

American Yarrow (Achille millefolium)
Near Kamiah, 20 May 1806

Bitter cherry (Prunus emarginata)
Near Kamiah, 29 May 1806

Blue bunch-wheat grass (Pseudoroegneria spicata)
Toward Weippe Prairie, 10 Jun 1806

Bull elephant head (Pedicularis groemlandica)
Lolo Trail, 16 June 1806

California false hellebore (Veratrum californicum)
Lolo Trail, 25 June 1806

Camas, Small (Camassia quamash)
Weippe Prairie, 23 June 1806

Canadian Bunchberry (Cornus Canadensis)
Near Kamiah, 20 May 1806

Canby's bluegrass (Aira brevifolia)
Weippe Prairie Area, June 10, 1806

Cascade mountain- ash (Sorbus scopulina)
Lolo Trail, 2 Sep 1805

Cascara false buckthorn (Frangula purshiana)
 Clearwater River near Kamiah 29 May 1806

Ciliated old man's whiskers (Geum triflorum)
Weippe Prairie area 12 June 1806

Clustered elkweed (Frasera fastigiata)
Weippe Prairie Area, 14 June 1806

Dwarf mountain fleabane (Erigeron compositus)
Clearwater River, Sep/Oct 1805

Fool's huckleberry (Menziesia ferrugiata)
Likely Idaho June 1806

Geyerís onion (Allium geyeri)
 Clearwater River near Kamiah, 30 May 1806

Idaho Fescue (Festuca idahoensis)
Near mouth of Lunch Creek Lolo Trail,  10 June 1806

Intermountain rusty lupine (Lupinus pusillus)
Near Kamiah, 27 May 1806

Jacobís ladder (Polemonium pulcherrimum)
Near Hungry Creek Lolo Trail, 27 June1806  

June Grass (Koeleria macrantha)
Near Kamiah, 5 June 1806

Lance-leaf spring beauty (Claytonia lanceolata)
Lolo Trail, 27 June 1806

Lance-leaf stonecrop (Sedum lanceolatum)
On the Kooskooskie near Kamiah, 5 June 1806

Lewisís syringa, Mock orange (Philadelphus lewisii)
Clearwater River, May 6, 1806

Long-leaf sun cup (Camissonia subacaulis)
Weippe Prairie area, 14 June 1806

Lyll's Angelica  (Angelica arguta)
Lost Trail Pass 3 Sep 1805  

Many-lobbed giant parsley (Lomatium dissectum var. multifidum)
Toward Weippe Prairie area June 10, 1806

Mariposa lily (Calochortus elegans)
Clearwater River near Kamiah, 17 May 1806

Narrow-leaved skullcap (Scutellaria angustifolia)
Clearwater River area near Kamiah, 5 June 1806

Ocean-spray, hillside (Holodiscus discolor)
 Clearwater River near Kamiah, 29 May 1806

Orange honeysuckle (Lonicera ciliosa)
Clearwater River near Kamiah, 5 June 1806

Oregon box-leaf (Paxistima myrsinites)
Lolo Trail, 16 June 1806

Oregon tea-tree (Ceanothus sanguineus)
Near Hungry Creek on Lolo Trail, 6 Jun 1806

Pineapple weed (Matricaria matricarioides)
Clearwater River near Kamiah, 12 June 1806

Pink fairies (Clarkia pulchella)
Clearwater River near Kamiah, 1 June 1806

Piper's Windflower (Anemone piperi)
Lolo Trail, 6 June 1806

Ponderosa pine, Rocky Mountain (Pinus ponderosa)
Clearwater River, 1 Oct 1805

Purple wake-robin (Trillium petiolatum)
Near mouth of Lunch Creek, 15 June 1806

Pursh's wallflower (Erysimum capitatum)
Clearwater River near Kamiah, 1 June 1806

Rabbit brush, green (Chrysothamnus viscidiflorus)
Clearwater River, 6 May 1806

Riverbank snowberry (Symphoricarpos albus)
Pattee Creek 13 Aug 1805

Rocky mountain honeysuckle (Lonicera utahensis)
North Fork of Salmon River,  2 Sep 1805 or Lolo Trail, 16 June 1806

Scarlet gilia (Ipomopsis aggregata)
Lolo Trail, 26 June 1806  

Showy phlox (Phlox speciosa)
Clearwater River, 7 May 1806

Shrub bear-tongue (Penstemon fruticosus)
Lolo Trail, 15 June 1806

Silky lupine (Lupinus sericeus)
Clearwater River near Kamiah, 5 June1806

Silver stem lupine (Lupinus argenteus)
Near Kamiah. 5 June 1806

Sticky currant (Ribes viscosissimum)
Lolo Trail, 16 June 1806

Sugar bowls (Clematis hirsutissima)
Clearwater River near Kamiah, 27  May 1806

Ternate desert parsley (Lomatium triternatum)
Clearwater River, 6 May 1806

Three-leaf bitterroot (Lewisia triphylla)
Near Hungry Creek Lolo Trail. 27 June 1806  

Tobacco bush (Ceanothus velutinus)
Prob. near Clearwater River, Sep/Oct 1805

Variable-leaf scorpion weed (Phacelia heterophylla)
Clearwater River near Kamiah, 9 June 1806

Western bear grass (Xerophyllum tenax)
Near mouth of Lunch Creek Lolo Trail  15 June 1806

Western chokecherry (Prunus virgininna)
Near Kamiah, 29 May 1806

Western fairy slipper orchid (Calypso bulbosa)
Lolo Trail, 27 June 1806

Western mountain kitten tail (Synthyris missurica)
Near Hungry Creek Lolo Trail, 26 June 1806

Wilcox's Beardtongue (Penstemon wilcoxii)
 Clearwater River Near Kamiah Area 20 May 1806

Wooly-sunflower (Eriophyllum lanatum)
Clearwater River near Kamiah, 6 June 1806

Yellow mission-bells (Fritillaria pudica)
Clearwater River, 8 May 1806

Yellow avalanche lily (Erythronium grandiflorum)
Lolo Trail, 15 June1806

Source: The Lewis and Clark Herbarium

Additional Plants Attributed to Lewis and Clark, but not in the Lewis and Clark Herbarium

Source: Lewis and Clark Special from the Oregonian

Cluster rose (Rosa pisocarpa)
Weippe Prairie Area, 10 Jun 1806

Engelmannís spruce (Picea engelmannii)
Lolo Trail, Sep 1805

Giant rye grass (Leymus condensatus)
Clearwater River Area, 5 Jun 1806

Lodgepole pine (Pinus contorta)
Lolo Trail, Sep 1805

Long-tailed wild ginger (Asarum caudatum)
Lolo Trail 27 Jun 1806  

Nootka rose (Rosa nutkana)
Weippe Prairie Area, 10 Jun 1806

Northwest crimson columbine  (Aquilegia formosa)
Lolo Trail, 16 Jun1806

Pacific yew (Taxus brevifolia)
Lolo Trail, Sep1805

Rocky Mountain maple (Acer glabrum)
Lemhi River, Aug. 13, 1805

Sitka alder (Alnus sinuata)
Lolo Trail, Sep 1805

Subalpine fir (Abies lasiocarpa)
Lolo Trail, Sep 1805

Tolmieís onion (Allium tolmiei)
Clearwater River Area 30 May1806

Umatilla gooseberry (Ribes cognatum)
Weippe Prairie Area 10 Jun 1806

Western larch (Larix occidentalis)
Lolo Trail, Sep 1805

Western red baneberry (Actaea arguta)
Lemhi River, 13 Aug 1805

Western red cedar (Thuja plicata)
Lolo Trail, Sep 1805]

Whitebark pine (Pinus albicaulis)
Lolo Trail, Sep 1805

Yellow-flowering pea (Lathyrus ochroleucus)
Lolo Trail 16 Jun 1806


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