Wildflowers Blooming in Idaho in September (60 Species)

60 wildflowers were recorded blooming in Idaho in September in our iNaturalist sample; 5 of the top 50 are at their peak this month. The list is ranked by number of research-grade observations.

Mar Apr May Jun Jul Aug Sep Oct

Top wildflowers in September

Rocky Mountain Beeplant38 obs.

Rubber Rabbitbrush26 obs.

Pearly Everlasting19 obs.

Curlycup Gumweed18 obs.

Bittersweet Nightshade8 obs.

Common Sunflower8 obs.

Spotted Knapweed8 obs.

All wildflowers blooming in Idaho in September

#	Species	Scientific name	Family	Obs.	Peak in state
1	Rocky Mountain Beeplant	Cleomella serrulata	Spider Flower Family	38	Aug (past peak)
2	Rubber Rabbitbrush	Ericameria nauseosa	Sunflowers, Daisies, Asters, and Allies	26	Sep (peak)
3	Pearly Everlasting	Anaphalis margaritacea	Sunflowers, Daisies, Asters, and Allies	19	Aug (past peak)
4	Curlycup Gumweed	Grindelia squarrosa	Sunflowers, Daisies, Asters, and Allies	18	Aug (past peak)
5	Common Tansy	Tanacetum vulgare	Sunflowers, Daisies, Asters, and Allies	12	Jul (past peak)
6	Great Mullein	Verbascum thapsus	figwort family	12	Jul (past peak)
7	Red Clover	Trifolium pratense	Legumes	9	Jun (past peak)
8	Fireweed	Chamaenerion angustifolium	evening primrose family	9	Jul (past peak)
9	Field Bindweed	Convolvulus arvensis	bindweed family	8	Jun (past peak)
10	Bittersweet Nightshade	Solanum dulcamara	nightshade family	8	Jun (past peak)
11	Common Sunflower	Helianthus annuus	Sunflowers, Daisies, Asters, and Allies	8	Aug (past peak)
12	Spotted Knapweed	Centaurea stoebe	Sunflowers, Daisies, Asters, and Allies	8	Oct (rising)
13	Dwarf Mallow	Malva neglecta	Mallow and Hibiscus Family	8	Sep (peak)
14	Purple Loosestrife	Lythrum salicaria	lythrum family	7	Aug (past peak)
15	Western Harebell	Campanula petiolata	bellflower family	7	Jul (past peak)
16	Common Yarrow	Achillea millefolium	Sunflowers, Daisies, Asters, and Allies	6	Jul (past peak)
17	Bull Thistle	Cirsium vulgare	Sunflowers, Daisies, Asters, and Allies	6	Jul (past peak)
18	Common St. John's Wort	Hypericum perforatum	St. John's wort family	6	Jul (past peak)
19	Yellow Sweetclover	Melilotus officinalis	Legumes	6	Jun (past peak)
20	Fringed Grass of Parnassus	Parnassia fimbriata	staff-vine family	6	Aug (past peak)
21	Threeleaf Foamflower	Tiarella trifoliata	saxifrage family	5	Jul (past peak)
22	White Clover	Trifolium repens	Legumes	5	Jun (past peak)
23	Black Medick	Medicago lupulina	Legumes	5	Jun (past peak)
24	Redstem Stork's-bill	Erodium cicutarium	Geranium family	4	Apr (past peak)
25	Common Toadflax	Linaria vulgaris	Plantain Family	4	Aug (past peak)
26	Chicory	Cichorium intybus	Sunflowers, Daisies, Asters, and Allies	4	Jul (past peak)
27	Yellow Salsify	Tragopogon dubius	Sunflowers, Daisies, Asters, and Allies	4	Jun (past peak)
28	Mountain Bog Gentian	Gentiana calycosa	gentian family	4	Aug (past peak)
29	Puncture Vine	Tribulus terrestris	caltrops	4	Aug (past peak)
30	Creeping buttercup	Ranunculus repens	buttercup family	3	Jun (past peak)
31	Oxeye Daisy	Leucanthemum vulgare	Sunflowers, Daisies, Asters, and Allies	3	Jun (past peak)
32	Musk Thistle	Carduus nutans	Sunflowers, Daisies, Asters, and Allies	3	Jul (past peak)
33	Common Dandelion	Taraxacum officinale	Sunflowers, Daisies, Asters, and Allies	2	Nov (rising)
34	Common Jewelweed	Impatiens capensis	balsam family	2	Aug (past peak)
35	Prickly Cucumber	Echinocystis lobata	gourd family	2	Aug (past peak)
36	Poison Hemlock	Conium maculatum	carrot family	2	Jun (past peak)
37	Narrowleaf Milkweed	Asclepias fascicularis	Dogbane Family	2	Jul (past peak)
38	Moth Mullein	Verbascum blattaria	figwort family	2	Jun (past peak)
39	Creeping Thistle	Cirsium arvense	Sunflowers, Daisies, Asters, and Allies	2	Aug (past peak)
40	Broad-Leaved Sweet Pea	Lathyrus latifolius	Legumes	2	Jun (past peak)
41	Showy Milkweed	Asclepias speciosa	Dogbane Family	2	Jun (past peak)
42	Deptford pink	Dianthus armeria	pink family	2	Jul (past peak)
43	Shrubby Cinquefoil	Dasiphora fruticosa	rose family	2	Jul (past peak)
44	Wild Carrot	Daucus carota	carrot family	2	Sep (peak)
45	Horseweed	Erigeron canadensis	Sunflowers, Daisies, Asters, and Allies	2	Sep (peak)
46	Flower-Of-An-Hour	Hibiscus trionum	Mallow and Hibiscus Family	2	Aug (past peak)
47	Upright Prairie Coneflower	Ratibida columnifera	Sunflowers, Daisies, Asters, and Allies	2	Sep (peak)
48	Canadian bunchberry	Cornus canadensis	Dogwood family	1	Jun (past peak)
49	Western Columbine	Aquilegia formosa	buttercup family	1	Jun (past peak)
50	Common Snowberry	Symphoricarpos albus	honeysuckle family	1	Jul (past peak)