Pigweed, rough (Amaranthus retroflex- 
us). See Rough pigweed. 
Plantain, black seeded (Plantago ruge- 
lii). Conn. (spp), Ga. (spp), Ind., 
La., Miss. (spp), Mo. (spp), O. (spp), 
Wash. (spp). 
Plantain, bottlebush (Plantago aristata). 
See Plantain, bracted. 
Plantain, bracted (Plantago aristata). 
Bottle bush plantain. Ala. Ark., 
Conn, (spp), “Hla: .Ga-0 (spp), und, 
La., Miss. (spp), Mo. (spp), O. (spp), 
Okla., Wash. (spp). 
Plantain, buckhorn (Plantago lanceo- 
lata). See Buckhorn, plantain. 
Plantain, common (Plantago major). 
Rippleseed Plantain. Conn. (spp), 
Ga. (spp), Ind., Miss. (spp), Mo. 
(spp), O. (spp), Ore., U., Wash. (spp). 
Poison hemlock (Conium maculatum). 
Us : 
Poison milkweed (Asclepias galioides). 
Whorled milkweed. Ariz., U. 
Povertyweed (Iva axillaris). Death- 
weed, Sumpweed. Ariz., Cal., Colo., 
Ore., U., Wash. 
Povertyweed, Franseria. 
tenuiofolia). Ariz., Colo. 
Povertyweed, silverleaf (Franseria dis- 
color). Whiteleaved Franseria. Ariz., 
Colo., Wyo. 
Povertyweed, Wolly-leaved (Franseria 
tementosa). Colo. 
Prickly sowthistle (Sonchus asper). See 
Sowthistle, prickly. 
Puncture-vine (Tribulus terrestris). 
Ariz., Cal., Colo. Ida., Neb., Nev., 
Ore., U. 
Purple flowered Ground-cherry (Quin- 
cula lobata). See Ground-cherry, 
purple flowered. 
Purple nightshade (Solanum elaeagni- 
folium). See Nightshade, purple. 
Purple star thistle (Centaurea calci- 
trapa). See Star thistle, purple. 
Q 
Quackgrass (Agropyron repens). Witch- 
grass. Cal., Colo., Conn., Del., Ga., 
Ida., Ill., Ind., Ia.. Kan., Ky., Me., Md., 
Mass., Mich., Minn., Mo., Mont., Neb., 
Nowe Ne Hy NaiioN, 0 N= DaknO; 
OklanOre. bas he Lo. Dakerbenny, 
oi ae Va., Wash., W. Va., Wis., Wyo., 
(Franseria 
R 
ie wild (Raphanus raphanistrum). 
Ragweed, common (Ambrosia artemisii- 
folia). Me. 
Ragweed, great (Ambrosia trifida). Me. 
Ragweed, perennial (Ambrosia psilos- 
tachya). See Ragweed, western. 
Ragweed, western (Ambrosia psilos- 
tachya). Perennial ragweed. Ariz., 
Me., U., Wyo. 
Ragweed, white (Franseria discolor). 
See Povertyweed, silverleaf. 
Red rice (Oryza sativa). Ark. 
Red sorrel (Rumex acetosella). See 
Sheep sorrel. 
Ribgrass (Plantago lanceolata). See 
Buckhorn. 
Rippleseed plantain (Plantago major). 
See Plantain, common. 
Rough pigweed (Amaranthus retroflex- 
us). Ga. 
Rutabaga (Brassica campestris). Me. 
Russian Knapweed (Centurea picris, C. 
repens). See Knapweed, Russian. 
Russian thistle (Salsola kali). Ariz., 
Cal., Mo., Okla., Tex. 
tS} 
Sage, lanceleaved (Salvia lanceolata). 
Wyo. 
Sandbur (Cenchruz pauciflorus). Bur 
grass. Ariz., Cal., Ga., Nev., S. C. 
Scabious, sweet (Erigeron annuus). See 
Sweet scabious. 
Scarlet Gaura (Gaura coccinea). See 
Gaura, scarlet. 
Scented gaura (Gaura odorata). See 
Gaura, scented. 
Sheep sorrel (Rumex acetosella). Red 
sorrel. Ala., Ark., Fla., Ind., Ia., Kan., 
Ky. (spp), La., Miss. (spp), Mo., O., 
Okla., R. I. (spp), Wash. (spp). 
Silverleaf povertyweed (Franseria dis- 
color). See Povertyweed, silverleaf. 
Smaller burdock (Arctium minus). See 
Burdock, smaller. 
Small-seeded false flax (Camelina mi- 
CrOCU PEN: See False flax, small-seed- 
ed. 
Sorrel, red and sheep (Rumex aceto- 
sella). See Sheep sorrel. 
Sowthistle, common (Sonchus olera- 
ceus). Me., W. Va. (spp). 
Sowthistle, perennial (Sonchus arven- 
sis). Field sowthistle. Ariz. Cal., 
Colo., Ida., Ill., Ind., Ia., Me., Mich., 
Minn., Mont., Nev., N. Dak., Okla., 
Ore, Pa, S:)Dak., US Wash, W- Va: 
(spp), Wis., Wyo. 
Sowthistle, prickly (Sonchus asper). 
Spinyleaved sowthistle. Me., W. Va. 
(spp). 
Sowthistle, spinyleaved (Sonchus as- 
per). See Sowthistle, prickly. 
Spotted cats-ear (Hypochaeris radi- 
cata). See Cats-ear, spotted. 
Spreading dogbane (Apocynum andro- 
saemifolium). See Dogbane, spread- 
ing. 
Spurge, flowering (Euphorbia corol- 
lata). Ida. (spp), Wyo. 
Spurge, leafy (Euphorbia esula). Ariz., 
Cal., Colo., Ida. (spp), Tll., Ia., Kan., 
Minn., Mont., Neb., Nev., N. Dak., 
Ore., S. Dak., U., Wash., Wis., Wyo. 
Squirrel-tail grass (Hordeum jubatum). 
See Barley wild. 
Star-thistle, Iberian (Centaurea iber- 
ica). Nev., Ore. 
Star-thistle, Malta (Centaurea meliten- 
sis). Ore. 
Star-thistle, purple (Centaurea calci- 
trapa). Nev. 
Star-thistle, yellow (Centaurea solsti- 
tialis). Cal., Nev., Ore., W. Va. 
Sena (Lappula echinata). Blue bur. 
e 
St. Johnswort (Hypericum perforatum). 
Goatweed, Klamath-weed. Cal., Nev., 
Ore., Wash., Wyo. : 
Sumpweed (Iva azillaris). See Pover- 
tyweed. 
Sweet scabious (Erigeron annus). Me. 
dh 
Tansy Mustard (Sisymbrium irio, S. 
sophia). See Mustard, tansy. 
Texas blueweed (Helianthus ciliaris). 
See Blueweed, Texas. 
Tie-vine (Convolvulus arvensis). See 
Bindweed, field. 
Thistle, bull (Cirsium lanceolatum). 
See Bull thistle. 
Thistle, Canada (Cirsium arvense). See 
Canada thistle. 
Thistle, Russian (Salsola Kali). See 
Russian thistle. 
Three-flowered nightshade (Solanum 
triflorum). See Nightshade, three- 
flowered. 
Toadflax, yellow (Linaria vulgaris). 
Ida., Ore., Wash. 
Tumble mustard (Sisymbrium altissi- 
mum). See Mustard, tumble. 
WwW 
Wavy-leaved Gaura (Gaura sinuata). 
See Gaura, wavy-leaved. 
Western ragweed (Ambrosia psilostach- 
ya). See Ragweed, western. 
White campion (Lychnis alba). See 
Campion, white. 
White horsenettle (Solanum elaeagni- 
folium). See Horsenettle, white. 
Whiteleaved Franseria (Franseria dis- 
color). See Povertyweed, silverleaf. 
White top (Hymenophysa pubescens). 
See Hoary cress. 
White top (lepidiwm draba, L. repens). 
See Hoary cress. 
Whorled milkweed (Asclepias galio- 
ides). See Poison milkweed. 
Wild Barley (Hordeum jubatum). See 
Barley, wild. 
Wild buckwheat (Polygonum convolvu- 
lus). See Buckwheat, wild. 
Wild carrot (Daucus carota). See Car- 
rot, wild. 
Wild Chicory (Cirhorium intybus). See 
Chicory, wild. ; 
Wild Garlic (Allium vineale). See 
Onion, wild. 
Wild morning-glory (Convolvulus ar- 
vensis). See Bindweed, field. 
Wild morning-glory (Convolvulus sepi- 
um). See Bindweed, hedge. 
Wild oats (Avena fatua). See Oats, wild. 
Wild onion (Allium vineale). See Onion, 
wild. : 
Wild mustard (Brassica arvensis). See 
Mustard, wild. 
Wild radish (Raphanus raphanistrum). 
See Radish, wild. 
Wintercress, bitter (Campe barbarea). 
Ind. 
Wire grass (Cynodon dactylon and ca- 
priola dactylon). See Burmuda grass. 
Wire grass (Paspalum distichum). Tex. 
Witchgrass (Agropyron repens). See 
Quackgrass. 
Wolly-leaved Povertyweed (Franseria 
tementosa). See Povertyweed, wolly- 
leaved. 
Y 
Yarrow (Achillea millefolium). Ore. 
Yellow cress (Rorippa sylvestris). Wyo. 
Yellow dock (Rumex crispus). See 
Dock, curly. 
Yellow toadflax (Linaria vulgaris). See 
Toadflax yellow. 
Yellow star-thistle (Centaurea solsti- 
tialis). See Star-thistle, yellow. 

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