1. acacia catclaw Acacia greggii
2. acacia mescat Acacia constricta
3. alfalfa Medicago sativa
4. alkaliweed Cressa truxillensis
5. alligatorweed Alternanthera philoxeroides
6. alyssum dwarf Alyssum desertorum
7. alyssum hoary Berteroa incana
8. alyssum yellow Alyssum alyssoides
9. amaranth Palmer Amaranthus palmeri
10. amaranth Powell Amaranthus powellii
11. amaranth slender Amaranthus viridis
12. amaranth spiny Amaranthus spinosus
13. ammannia purple Ammannia coccinea
14. anoda spurred Anoda cristata
15. apple of Peru Nicandra physalodes
16. arrowgrass seaside Triglochin maritima
17. arrowhead California Sagittaria montevidensis
18. arrowhead common Sagittaria latifolia
19. arrowhead Gregg Sagittaria longiloba
20. arrowhead slender Sagittaria graminea
21. arrowhead wedgeleaf Sagittaria cuneata
22. artichoke Jerusalem Helianthus tuberosus
23. ash green Fraxinus pennsylvanica
24. asparagus Asparagus officinalis
25. aster heath Symphyotrichum ericoides
26. aster hoary Machaeranthera canescens
27. aster New England Symphyotrichum novae-angliae
28. aster slender Symphyotrichum subulatum
29. aster western Symphyotrichum spathulatum
30. aster white prairie Symphyotrichum pilosum
31. aster woody Xylorhiza glabriuscula
32. avens white Geum canadense
33. baby blue eyes Great Basin Nemophila breviflora
34. babysbreath Gypsophila paniculata
35. baccharis eastern Baccharis salicifolia
36. baccharis willow Baccharis salicina
37. baileya desert Baileya multiradiata
38. balloonvine Cardiospermum halicacabum
39. balsamroot arrowleaf Balsamorhiza sagittata
40. barberry European Berberis vulgaris
41. barberry Japanese Berberis thunbergii
42. bassia fivehook Bassia hyssopifolia
43. beancaper Syrian Zygophyllum fabago
44. bedstraw catchweed Galium aparine
45. bedstraw northern Galium boreale
46. bedstraw smooth Galium mollugo
47. bedstraw wall Galium divaricatum
48. bedstraw yellow Galium verum
49. beeplant Rocky Mountain Cleome serrulata
50. beeplant yellow Cleome lutea

51. beggarticks devils Bidens frondosa
52. beggarticks hairy Bidens pilosa
53. beggarticks nodding Bidens cernua
54. beggarticks white Bidens alba
55. beggarweed creeping Desmodium incanum
56. beggarweed Florida Desmodium tortuosum
57. bellflower American Campanulastrum americanum
58. bellflower clustered Campanula glomerata
59. bellflower creeping Campanula rapunculoides
60. bergamot wild Monarda fistulosa
61. betony Florida Stachys floridana
62. bindweed field Convolvulus arvensis
63. bindweed hedge Calystegia sepium
64. birch river Betula nigra
65. bitter apple Cucumis myriocarpus
66. bittercress hairy Cardamine hirsuta
67. bittercress little Cardamine oligosperma
68. bittercress Pennsylvania Cardamine pensylvanica
69. bittercress smallflowered Cardamine parviflora
70. blackberry common Rubus allegheniensis
71. blackberry cutleaf Rubus laciniatus
72. blackberry Himalaya Rubus armeniacus
73. blackeyed Susan Rudbeckia hirta
74. bladderflower Araujia sericifera
75. bladderpod Gordon's Physaria gordonii
76. blazing star Mentzelia laevicaulis
77. bluebuttons Knautia arvensis
78. bluet mountain Centaurea montana
79. bluet narrowleaf Stenaria nigricans var. nigricans
80. blueweed Echium vulgare
81. blueweed Texas Helianthus ciliaris
82. boneset Eupatorium perfoliatum
83. boneset late Eupatorium serotinum
84. borage Borago officinalis
85. bouncingbet Saponaria officinalis
86. box elder Acer negundo
87. brackenfern Pteridium aquilinum
88. brassbuttons southern Cotula australis
89. broom Scotch Cytisus scoparius
90. broomrape branched Orobanche ramosa
91. broomrape small Orobanche minor
92. broomweed common Amphiachyris dracunculoides
93. browneyed Susan Rudbeckia triloba
94. bryony white Bryonia alba
95. buckbrush Symphoricarpos orbiculatus
96. buckeye little Aesculus pavia
97. buckthorn Rhamnus lanceolata
98. buckthorn alder Frangula alnus
99. buckthorn European Rhamnus cathartica
100. buckwheat Fagopyrum esculentum

101. buckwheat tartary Fagopyrum tataricum
102. buckwheat wild Polygonum convolvulus
103. buffalobur Solanum rostratum
104. bugle carpet Ajuga reptans
105. bugleweed American Lycopus americanus
106. bugleweed rough Lycopus asper
107. bugloss common Anchusa officinalis
108. bugloss small Anchusa arvensis
109. bullnettle Cnidoscolus urens var. stimulosus
110. bundleflower Illinois Desmanthus illinoensis
111. burclover California Medicago polymorpha
112. burcucumber Sicyos angulatus
113. burdock common Arctium minus
114. burdock great Arctium lappa
115. burhead Echinodorus berteroi
116. burnet annual Sanguisorba annua
117. burnet salad Sanguisorba minor
118. burnweed American Erechtites hieraciifolia
119. burnweed Australian Erechtites minima
120. bursage annual Ambrosia acanthicarpa
121. bursage skeletonleaf Ambrosia tomentosa
122. bursage woolyleaf Ambrosia grayi
123. burweed lawn Soliva sessilis
124. buttercup bur Ceratocephala testiculata
125. buttercup California Ranunculus californicus
126. buttercup corn Ranunculus arvensis
127. buttercup creeping Ranunculus repens
128. buttercup crowfoot Ranunculus sceleratus
129. buttercup hairy Ranunculus sardous
130. buttercup shore Ranunculus cymbalaria
131. buttercup small flower Ranunculus parviflorus
132. buttercup smallflower Ranunculus abortivus
133. buttercup tall Ranunculus acris
134. butterfly bush Buddleja davidii
135. buttonbush Cephalanthus occidentalis
136. buttonweed Virginia Diodia virginiana
137. cactus pincushion Escobaria vivipara
138. caltrop orange Kallstroemia grandiflora
139. camelthorn Alhagi maurorum
140. camphorweed Heterotheca subaxillaris
141. campion biennial Silene csereii
142. campion bladder Silene vulgaris
143. campion rose Lychnis coronaria
144. campion white Silene latifolia ssp. alba
145. canaigre Rumex hymenosepalus
146. caraway common Carum carvi
147. cardinal flower blue Lobelia siphilitica
148. cardoon Cynara cardunculus
149. carpenter's square Scrophularia marilandica
150. carpetweed Mollugo verticillata

151. carrot wild Daucus carota
152. castorbean Ricinus communis
153. catalpa northern Catalpa speciosa
154. catchfly English Silene gallica
155. catchfly nightflowering Silene noctiflora
156. catchfly sleepy Silene antirrhina
157. catchweed Asperugo procumbens
158. catnip Nepeta cataria
159. catsear common Hypochaeris radicata
160. catsear smooth Hypochaeris glabra
161. cattail common Typha latifolia
162. cattail narrowleaf Typha angustifolia
163. cattail southern Typha domingensis
164. celandine greater Chelidonium majus
165. celery wild Cyclospermum leptophyllum
166. chamomile corn Anthemis arvensis
167. chamomile mayweed Anthemis cotula
168. chamomile scentless Tripleurospermum perforatum
169. chamomile wild Matricaria recutita
170. chamomile yellow Anthemis tinctoria
171. cherry black Prunus serotina
172. chervil bur Anthriscus caucalis
173. chervil wild Anthriscus sylvestris
174. chickweed Bermuda Drymaria cordata
175. chickweed common Stellaria media
176. chickweed field Cerastium arvense
177. chickweed mouseear Cerastium fontanum
178. chickweed sticky Cerastium glomeratum
179. chicory Cichorium intybus
180. chokecherry common Prunus virginiana
181. cinquefoil Canada Potentilla canadensis
182. cinquefoil rough Potentilla norvegica
183. cinquefoil shrubby Dasiphora fruticosa
184. cinquefoil silverweed Argentina anserina
185. cinquefoil silvery Potentilla argentea
186. cinquefoil slender Potentilla gracilis
187. cinquefoil sticky Potentilla glandulosa
188. cinquefoil sulfur Potentilla recta
189. citronmelon Citrullus lanatus
190. clammyweed western Polanisia dodecandra
191. climbing fern Lygodium japonicum
192. clover alsike Trifolium hybridum
193. clover crimson Trifolium incarnatum
194. clover hop Trifolium aureum
195. clover large hop Trifolium campestre
196. clover rabbitfoot Trifolium arvense
197. clover red Trifolium pratense
198. clover small hop Trifolium dubium
199. clover Spanish Lotus unifoliolatus
200. clover strawberry Trifolium fragiferum

201. clover white Trifolium repens
202. cockle corn Agrostemma githago
203. cocklebur common Xanthium strumarium
204. cocklebur spiny Xanthium spinosum
205. collomia large flowered Collomia grandiflora
206. collomia narrow leaved Collomia linearis
207. coltsfoot Tussilago farfara
208. comfrey common Symphytum officinale
209. compassplant Silphium laciniatum
210. coneflower cutleaf Rudbeckia laciniata
211. coneflower pinnate prairie Ratibida pinnata
212. coneflower upright prairie Ratibida columnifera
213. coontail Ceratophyllum demersum
214. copperleaf hophornbeam Acalypha ostryifolia
215. copperleaf rhombic Acalypha rhomboidea
216. copperleaf slender Acalypha gracilens
217. copperleaf Virginia Acalypha virginica
218. coreopsis plains Coreopsis tinctoria
219. cornflower Centaurea cyanus
220. cornsalad Valerianella radiata
221. cornsalad common Valerianella locusta
222. corydalis golden Corydalis aurea
223. costmary Tanacetum balsamita
224. cottonwood plains Populus deltoides
225. cowcockle Vaccaria hispanica
226. cowpea Vigna unguiculata
227. crane's bill wild Geranium maculatum
228. crazyweed Lambert Oxytropis lambertii
229. crazyweed silky Oxytropis sericea
230. creosotebush Larrea tridentata
231. cress hoary Cardaria draba
232. cress mouse ear Arabidopsis thaliana
233. crockeria Lasthenia chrysantha
234. crotalaria showy Crotalaria spectabilis
235. croton prairie tea Croton monanthogynus
236. croton tropic Croton glandulosus
237. croton wooly Croton capitatus
238. crownbeard Verbesina encelioides
239. crownvetch trailing Securigera varia
240. crupina common Crupina vulgaris
241. cucumber wild Echinocystis lobata
242. cudweed cottonbatting Pseudognaphalium stramineum
243. cudweed fragrant Pseudognaphalium obtusifolium
244. cudweed low Gnaphalium uliginosum
245. cudweed lowland Gnaphalium palustre
246. cudweed purple Gamochaeta purpurea
247. cuphea clammy Cuphea viscosissima
248. Cupid's shaving brush Emilia fosbergii
249. daisy English Bellis perennis
250. daisy oxeye Leucanthemum vulgare

251. damesrocket Hesperis matronalis
252. dandelion Taraxacum officinale
253. dandelion smooth Taraxacum laevigatum
254. datura sacred Datura wrightii
255. datura small Datura discolor
256. day lily Hemerocallis fulva
257. dayflower Asiatic Commelina communis
258. dayflower spreading Commelina diffusa
259. deadnettle purple Lamium purpureum
260. deadnettle spotted Lamium maculatum
261. deathcamas foothill Toxicoscordion paniculatum
262. deathcamas meadow Toxicoscordion venenosum
263. desert dandelion cliff Malacothrix saxatilis
264. devil's claw yellow Ibicella lutea
265. devil's claw Proboscidea louisianica
266. dichondra Carolina Dichondra carolinensis
267. dock broadleaf Rumex obtusifolius
268. dock cluster Rumex conglomeratus
269. dock curly Rumex crispus
270. dock narrowleaf Rumex stenophyllus
271. dock pale Rumex altissimus
272. dock veiny Rumex venosus
273. dock willow leaved Rumex salicifolius
274. dodder lespedeza Cuscuta pentagona
275. dogbane hemp Apocynum cannabinum
276. dogbane spreading Apocynum androsaemifolium
277. dogfennel Eupatorium capillifolium
278. dragonhead American Dracocephalum parviflorum
279. ducksalad Heteranthera limosa
280. duckweed common Lemna minor
281. duckweed giant Spirodela polyrrhiza
282. eclipta Eclipta prostrata
283. elderberry common Sambucus nigra ssp. canadensis
284. elecampane Inula helenium
285. elm Siberian Ulmus pumila
286. elodea Brazilian Egeria densa
287. elodea common Elodea canadensis
288. eveningprimrose common Oenothera biennis
289. eveningprimrose cutleaf Oenothera laciniata
290. eveningprimrose Hooker's Oenothera elata
291. eveningprimrose prairie Oenothera albicaulis
292. eveningprimrose showy Oenothera speciosa
293. eveningprimrose silky Oenothera villosa
294. eveningprimrose small flowered Oenothera parviflora
295. everlasting pearly Anaphalis margaritacea
296. false hellebore California Veratrum californicum
297. false hellebore green Veratrum viride
298. false mallow hispid Malvastrum hispidum
299. falsedandelion Carolina Pyrrhopappus carolinianus
300. falseflax smallseed Camelina microcarpa