Editor Stacey H. Stovall, Conservation Innovations, Inc. Subbasin Team Leader

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Noxious Weeds

Rare and Endemic Plants Species

Twenty-seven rare plant species occur in all of the nine Boise-Payette-Weiser subbasin watersheds in a combined total of 157 populations (Table 17). Eight of the twenty-seven species have ranks from G1 to G3 designating them rare and imperiled globally: Mulford's milkvetch (Astragalus mulfordiae), Indian Valley sedge (Carex aboriuinum), Cusick's false yarrow (Chaenactis cusickii), silverskin lichen (Dermatocarpon lorencianum), Idaho douglasia (Douglasia idahoensis), slick spot peppergrass (Lepidium papilliferum), pored lungwort (Lobaria scobiculata), and Douglas clover (Trifolium douglasii). Indian Valley sedge is considered both critically imperiled and especially vulnerable to extinction globally and statewide (rank G1S1). Indian Valley Sedge is known from two locations within the mainstem Weiser River watershed. Six rare plant species within the subbasins are considered critically imperiled. All occurrences of these species are located in the North Fork Payette River and mainstem Weiser River watersheds. One hundred and fourteen populations of imperiled plant species occur with relatively even distribution throughout the subbasin. Populations of Mulford’s milkvetch and slick spot peppergrass occur with high frequency in the Lower Boise River watershed.

Noxious Weeds

Thirty-two noxious weed species are known to occur within the Boise-Payette-Weiser subbasins (Table 18). Current location data on species occurrences within the subbasin are limited, and

Table 17. Rare and endemic plant species (with global rank G1 through G3 or state rank S1 through S2) known to occur within the Boise-Payette-Weiser subbasins are listed by species with the number of population occurrences summarized by watershed.

Species	Common name	G Rank	S Rank	North and Middle Fork Boise	Boise-Mores	South Fork Boise	Lower Boise	South Fork Payette	Middle Fork Payette	Payette	North Fork Payette	Weiser	Total
Aster junciformis	rush aster	G5	S2								1		1
Astragalus cusickii var. packardiae	Packard's milkvetch	G5T1	S2							6			6
Astragalus mulfordiae	Mulford's milkvetch	G2	S2				22					2	24
Buxbaumia viridis	buxbaumia moss	G4	S2								1		1
Camassia cusickii	Cusick's camas	G4	S2							1		1	2
Carex aboriginum	Indian Valley sedge	G1	S1									2	2
Carex livida	pale sedge	G5	S2					1					1
Carex straminiformis	Mt. Shasta sedge	G4	S2					1					1
Catapyrenium congestum	earth lichen	G4	S2				1						1
Ceanothus protratus	mahala-mat ceanothus	G5	S1									2	2
Chaenactis cusickii	Cusick's false yarrow	G2G3	S2				1						1
Cyperus rivularis	shining flatsedge	G5	S2				4			3			7
Dermatocarpon lorencianum	silverskin lichen	G2	S1									1	1
Douglasia idahoensis	Idaho douglasia	G2	S2	7				7	3		2		19
Eriogonum ochrocephalum var. calcareum	calcareous buckwheat	G4T3	S2							6			6
Eriophorum viridicarinatum	green keeled cotton grass	G5	S2								1		1
Lepidium papiliferum	slick spot peppergrass	G2	S2				29			4			33
Lewisia kelloggii	Idaho bitterroot	G4	S2	1	1	6		3	1		2	1	15
Lobaria scrobiculata	Pored lungwort	G3G4	S1								1		1
Peraphyllum ramosissimum	squaw apple	G4	S2									8	8
Sanicula graveolens	sierra sanicle	G4	S1								2		2
Saxifraga bryophora var. tobiasiae	Tobias' saxifrage	G5T1	S1								5		5
Stylocline filaginea	stylocline	G4	S2			1	1						2
Teucrium canadense var. occidentale	American wood sage	G5T5	S2				1					1	2
Texosporium sancti-jacobi	wovenspore lichen	G2	S2				11						11
Trifolium douglasii	Douglas' clover	G3G4	S2									1	1
Trifolium plumosum var. amplifolium	plumed clover	G4T2	S2									1	1
													157.0

Table 18. Noxious weed species distributions within the Boise-Payette-Weiser subbasins are summarized by county. Data are taken from Morishita et al. (2001) with supplemental information from field contacts.

Species	Common name	Ada	Adams	Boise	Camas	Canyon	Elmore	Gem	Payette	Valley	Washington
Sorghum halepense	Johnsongrass					X
Cytisus scoparius	Scotch broom					X
Solanum elaeagnifolium	silverleaf nightshade					X
Milium vernale	spring millet grass									X
Senecio jacobaea	tansy ragwort									X
Crupina vulgaris	common crupina		X							X
Isatis tinctoria	dyer's woad		X								X
Sonchus arvensis	perennial sowthistle								X	X
Hyoscyamus niger	black henbane				X	X	X
Hieracium aurantiacum	orange hawkweed		X				X			X
Solanum rostratum	buffalobur					X	X	X			X
Carduus nutans	musk thistle		X		X		X	X
Euphorbia esula	leafy spurge		X	X	X		X			X	X
Lepidium latifolium	perennial pepperweed	X		X		X		X	X		X
Centaurea solstitialis	yellow starthistle	X	X	X		X	X	X			X
Aegilops cylindrica	jointed goatgrass	X	X	X		X	X	X		X	X
Centaurea repens	Russian knapweed	X			X	X	X	X	X	X	X
Linaria vulgaris	yellow toadflax		X	X	X	X		X	X	X	X
Centaurea diffusa	diffuse knapweed	X	X	X	X		X	X	X	X	X
Conium maculatum	poison hemlock	X	X	X		X	X	X	X	X	X
Tribulus terrestris	puncturevine	X	X	X	X	X	X	X	X		X
Lythrum salicaria	purple loosestrife	X	X	X	X	X	X	X	X		X
Centaurea maculosa	spotted knapweed	X	X	X	X		X	X	X	X	X
Cirsium arvense	Canada thistle	X	X	X	X	X	X	X	X	X	X
Linaria dalmatica	dalmatian toadflax	X	X	X	X	X	X	X	X	X	X
Convolvulus arvensis	field bindweed	X	X	X	X	X	X	X	X	X	X
Cardaria draba	hoary cress	X	X	X	X	X	X	X	X	X	X
Chondrilla juncea	rush skeletonweed	X	X	X	X	X	X	X	X	X	X
Onopordum acanthium	Scotch thistle	X	X	X	X	X	X	X	X	X	X

only allow identification to county. A number of species are relatively widespread within the subbasins, including: jointed goatgrass, Russian knapweed, yellow toadflax, diffuse knapweed, poison hemlock, puncturevine, purple loosestrife, spotted knapweed, Canada thistle, dalmatian toadflax, field bindweed, hoary cress, rush skeletonweed, and Scotch thistle. Noxious weed species of emerging concern include: Johnsongrass, Scotch broom, silverleaf nightshade, spring millet grass, tansy ragwort, common crupina, dyer's woad, perennial sowthistle, black henbane, and orange hawkweed.

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