| 5376392 |
common crupina |
Crupina vulgaris |
Fruit attachment scar. FNW taxon. |
| 5376391 |
crupina |
Crupina crupinastrum |
Fruit attachment scar. Similar to an FNW taxon. |
| 1459664 |
yellow starthistle |
Centaurea solstitialis |
Spines |
| 1354007 |
purple starthistle |
Centaurea calcitrapa |
Sharp spines |
| 1265072 |
British yellowhead |
Inula britannica |
Hair on Inula stems |
| 1459302 |
prickly lettuce |
Lactuca serriola |
Prickles |
| 1459660 |
yellow starthistle |
Centaurea solstitialis |
winged stem margins |
| 1459723 |
bull thistle |
Cirsium vulgare |
Spines |
| 1358484 |
cutleaf daisy |
Erigeron compositus |
Flower base |
| 1459264 |
Russian knapweed |
Rhaponticum repens |
Bud stage with detached bracts |
| 1383043 |
prickly lettuce |
Lactuca serriola |
Stem and foliage |
| 1358114 |
Parry's arnica |
Arnica parryi |
Closed flower head |
| 1459662 |
yellow starthistle |
Centaurea solstitialis |
Spines |
| 1358579 |
blackhead fleabane |
Erigeron melanocephalus |
Closed flower-head |
| 1358091 |
broadleaf arnica |
Arnica latifolia |
Base of flower |
| 1459663 |
yellow starthistle |
Centaurea solstitialis |
Spines |
| 1383041 |
prickly lettuce |
Lactuca serriola |
Milky sap |
| 1358424 |
horseweed |
Conyza canadensis |
Foliage and flower bud |
| 1459266 |
spotted knapweed |
Centaurea stoebe ssp. micranthos |
|
| 2106039 |
whiteflower leafcup |
Polymnia canadensis |
Unopened flower bud |
| 5401174 |
Santa Cruz tarplant |
Holocarpha macradenia |
|
| 5422861 |
narrowleaf hawksbeard |
Crepis tectorum |
|
| 5422896 |
false chamomile |
Tripleurospermum perforatum |
|
| 5413790 |
Paraguay starbur |
Acanthospermum australe |
Habit |
| 1554017 |
Jerusalem artichoke |
Helianthus tuberosus |
leaf attachment |
| 5273046 |
Scotch thistle |
Onopordum acanthium |
Spines on Leaves |
| 5275003 |
coltsfoot |
Tussilago farfara |
Close-up of Seed Head (fruit) |
| 1196086 |
oxeye daisy |
Leucanthemum vulgare |
involucral bracts |
| 5374445 |
American burnweed |
Erechtites hieraciifolius |
flowering and fruiting heads |
| 5383084 |
diffuse knapweed |
Centaurea diffusa |
typical bleaching of inflorescence after the emergence of Larinus minutus. |
| 5383083 |
diffuse knapweed |
Centaurea diffusa |
typical bleaching of inflorescence after the emergence of Larinus minutus. |
| 5383076 |
diffuse knapweed |
Centaurea diffusa |
typical bleaching of inflorescence after the emergence of Larinus minutus. |
| 5374597 |
common cocklebur |
Xanthium strumarium |
flower and fruit |
| 5374585 |
lesser hawkbit |
Leontodon taraxacoides |
flower and fruiting heads |
| 5374550 |
woodland groundsel |
Senecio sylvaticus |
flowering and fruiting heads |
| 5374516 |
willowleaf lettuce |
Lactuca saligna |
leaves and stem |
| 5374501 |
stinkwort |
Dittrichia graveolens |
flowers and fruits |
| 5374449 |
smallflower galinsoga |
Galinsoga parviflora |
persistent chaff on receptacle |
| 5374448 |
smallflower galinsoga |
Galinsoga parviflora |
leaf, flower, and fruit |
| 5374434 |
cape ivy |
Delairea odorata |
biotype with stipules. |
| 5374435 |
cape ivy |
Delairea odorata |
biotype without stipules |
| 5374433 |
cape ivy |
Delairea odorata |
flower heads and foliage. |
| 5374417 |
Italian hawksbeard |
Crepis bursifolia |
flowers and fruit |
| 5374375 |
chicory |
Cichorium intybus |
rosettes with previous years stems |
| 5374354 |
Malta starthistle |
Centaurea melitensis |
buds and flower head |
| 5374332 |
diffuse knapweed |
Centaurea diffusa |
buds on rootstalk |
| 5374287 |
slender aster |
Symphyotrichum divaricatum |
flower and fruit |
| 5374270 |
field marigold |
Calendula arvensis |
flower and fruit |
| 5371308 |
slenderflower thistle |
Carduus tenuiflorus |
flowering stems. From Weeds of California and other Western States. |
| 5358658 |
musk thistle |
Carduus nutans |
Close-up view of the stems of musk thistle (Carduus nutans) showing spiny flanges, with a flower bud in the background. |
| 5358640 |
spotted knapweed |
Centaurea stoebe ssp. micranthos |
Close-up view of the flower heads of a spotted knapweed plant, Centaurea stoebe ssp. micranthos (Centaurea maculosa), showing the characteristic blackish spots on the bracts. |
| 5358636 |
Russian knapweed |
Rhaponticum repens |
Close-up view of the stem and leaves of Russian knapweed (Acroptilon repens), showing characteristic fuzz (hairs, "knap"). |
| 1551083 |
prickly lettuce |
Lactuca serriola |
underside of leaf |
| 1559155 |
western salsify |
Tragopogon dubius |
pappus |
| 1556271 |
hawkweeds |
Hieracium spp. |
roots and flower |
| 1556270 |
hawkweeds |
Hieracium spp. |
roots and flower |
| 1555181 |
chicory |
Cichorium intybus |
|
| 1553222 |
prickly lettuce |
Lactuca serriola |
|
| 1553209 |
spotted joe pye weed |
Eupatoriadelphus maculatus |
leaf axils |
| 1553202 |
hawkweeds |
Hieracium spp. |
leaves and flower |
| 1553176 |
dandelion |
Taraxacum spp. |
seed head |
| 1553142 |
common burdock |
Arctium minus |
seed head |
| 1554299 |
common burdock |
Arctium minus |
seed heads |
| 1554300 |
common burdock |
Arctium minus |
seed heads |
| 1554288 |
common burdock |
Arctium minus |
capitula |
| 1554047 |
white heath aster |
Symphyotrichum ericoides var. ericoides |
capitulum |
| 1554020 |
Jerusalem artichoke |
Helianthus tuberosus |
leaf margin |
| 1554012 |
Jerusalem artichoke |
Helianthus tuberosus |
|
| 1551186 |
Canada thistle |
Cirsium arvense |
|
| 1551179 |
bull thistle |
Cirsium vulgare |
seed head |
| 1551177 |
bull thistle |
Cirsium vulgare |
leaf apex |
| 1551164 |
perennial sowthistle |
Sonchus arvensis |
leaf margin |
| 1551162 |
perennial sowthistle |
Sonchus arvensis |
leaf margin |
| 1551025 |
oxeye daisy |
Leucanthemum vulgare |
|
| 1551016 |
chicory |
Cichorium intybus |
|
| 5091022 |
thistle |
Cirsium spp. |
bracts |
| 5093093 |
blackhead fleabane |
Erigeron melanocephalus |
underside of flower showing bract |
| 5106054 |
horned dandelion |
Taraxacum ceratophorum |
flower bud |
| 5096002 |
Nuttall's sunflower |
Helianthus nuttallii |
profile of bracts |
| 5094083 |
blanketflower |
Gaillardia aristata |
flower bud |
| 5095093 |
fivenerve helianthella |
Helianthella quinquenervis |
flower bud with ants |
| 1459736 |
thistle |
Cirsium spp. |
Bracts clockwise from top left: Musk, Bull, Scotch, and Canada thistle |
| 1459798 |
Scotch thistle |
Onopordum acanthium |
Flower and foliage |
| 1358495 |
large mountain fleabane |
Erigeron coulteri |
Flower base |
| 1294019 |
British yellowhead |
Inula britannica |
This plant can remain green even throughout winter. |
| 1294029 |
British yellowhead |
Inula britannica |
Root system showing means of vegetative spread |
