| 5452860 |
ornamental jewelweed |
Impatiens glandulifera |
|
| 5452846 |
ornamental jewelweed |
Impatiens glandulifera |
|
| 5452771 |
giant hogweed |
Heracleum mantegazzianum |
|
| 5452772 |
giant hogweed |
Heracleum mantegazzianum |
|
| 5341069 |
Japanese dodder |
Cuscuta japonica |
|
| 5344014 |
air-potato |
Dioscorea bulbifera |
bulbils |
| 5285098 |
common cocklebur |
Xanthium strumarium |
burs |
| 1330036 |
garlic mustard |
Alliaria petiolata |
S-shaped crook at base of plant helps to distinguish this species. Martin County, KY |
| 1381003 |
Benghal dayflower |
Commelina benghalensis |
Red hairs on leaf sheath |
| 5436719 |
burcucumber |
Sicyos angulatus |
|
| 1336004 |
Benghal dayflower |
Commelina benghalensis |
The underground flowers appear as swollen nodes. Thomas County, GA |
| 0016104 |
air-potato |
Dioscorea bulbifera |
Bulbils (aerial tubers) and alternate foliage in September |
| 1354007 |
purple starthistle |
Centaurea calcitrapa |
Sharp spines |
| 1265072 |
British yellowhead |
Inula britannica |
Hair on Inula stems |
| 1459302 |
prickly lettuce |
Lactuca serriola |
Prickles |
| 5430641 |
air-potato |
Dioscorea bulbifera |
Bulbils attached to vine |
| 5422990 |
Sprenger's asparagus fern |
Asparagus aethiopicus |
Notice thorns at the nodes. |
| 1459660 |
yellow starthistle |
Centaurea solstitialis |
winged stem margins |
| 5126013 |
winged yam |
Dioscorea alata |
Aerial tubers (bubils) |
| 1334162 |
wild parsnip |
Pastinaca sativa |
Senescing seed heads. |
| 1459723 |
bull thistle |
Cirsium vulgare |
Spines |
| 5344079 |
chamber bitter |
Phyllanthus urinaria |
|
| 1363367 |
Russian-thistle |
Salsola tragus |
Stem and foliage |
| 1461062 |
giant reed |
Arundo donax |
Leaf collar region |
| 1383043 |
prickly lettuce |
Lactuca serriola |
Stem and foliage |
| 1363368 |
Russian-thistle |
Salsola tragus |
Spines |
| 1358353 |
Canada thistle |
Cirsium arvense |
Stem and foliage |
| 1380251 |
small broomrape |
Orobanche minor |
Roots |
| 0016181 |
shrubby lespedeza |
Lespedeza bicolor |
back and front of leaves in July |
| 1358309 |
musk thistle |
Carduus nutans |
Stem and foliage |
| 5422002 |
alligatorweed |
Alternanthera philoxeroides |
Nodes
In July |
| 1554017 |
Jerusalem artichoke |
Helianthus tuberosus |
leaf attachment |
| 5392987 |
curlyleaf pondweed |
Potamogeton crispus |
Turions |
| 5392988 |
curlyleaf pondweed |
Potamogeton crispus |
Turions |
| 5392116 |
air-potato |
Dioscorea bulbifera |
Aerial bulbil |
| 5391745 |
giant salvinia |
Salvinia molesta |
"eggbeater" shaped leaf features |
| 5274013 |
lesser celandine, fig buttercup |
Ficaria verna |
Bulbs |
| 5273046 |
Scotch thistle |
Onopordum acanthium |
Spines on Leaves |
| 5272042 |
ornamental jewelweed |
Impatiens glandulifera |
Close-up of Glands |
| 5270068 |
narrowleaf bittercress |
Cardamine impatiens |
Infructescence |
| 5387493 |
giant reed |
Arundo donax |
Second-year branching pattern of giant reed |
| 5387495 |
giant reed |
Arundo donax |
vegetatively reproducing from stem fragment. |
| 5387024 |
buttercup oxalis |
Oxalis pes-caprae |
bulbs and bulblets. |
| 5386906 |
little mallow |
Malva parviflora |
flowering and fruiting stem. |
| 5386774 |
cutleaf geranium |
Geranium dissectum |
flowering and fruiting stem. |
| 5370201 |
Asiatic dayflower |
Commelina communis |
leaf attachment |
| 5374978 |
common St. Johnswort |
Hypericum perforatum |
sprout from rhizome |
| 5374966 |
Fuller's teasel |
Dipsacus sativus |
leaf base and stem |
| 5374963 |
common teasel |
Dipsacus fullonum |
leaf base and stem |
| 5275003 |
coltsfoot |
Tussilago farfara |
Close-up of Seed Head (fruit) |
| 1196086 |
oxeye daisy |
Leucanthemum vulgare |
involucral bracts |
| 0002106 |
giant salvinia |
Salvinia molesta |
the hairs form an 'egg-beater' shape at the tips |
| 5374417 |
Italian hawksbeard |
Crepis bursifolia |
flowers and fruit |
| 5374401 |
horseweed |
Conyza canadensis |
flowering and fruiting |
| 5374396 |
hairy fleabane |
Conyza bonariensis |
flowering and fruiting stem |
| 5374375 |
chicory |
Cichorium intybus |
rosettes with previous years stems |
| 5374370 |
rush skeletonweed |
Chondrilla juncea |
downward pointing hairs at base of the stem |
| 5374362 |
sulphur knapweed |
Centaurea sulphurea |
stem and leaves |
| 5374354 |
Malta starthistle |
Centaurea melitensis |
buds and flower head |
| 5374342 |
squarrose knapweed |
Centaurea virgata |
stem and leaves |
| 5374337 |
spotted knapweed |
Centaurea stoebe ssp. micranthos |
stem and leaves |
| 5374332 |
diffuse knapweed |
Centaurea diffusa |
buds on rootstalk |
| 5374270 |
field marigold |
Calendula arvensis |
flower and fruit |
| 5374184 |
spotted water hemlock |
Cicuta maculata var. angustifolia |
chambered root |
| 5374166 |
bur chervil |
Anthriscus caucalis |
flowers and foliage |
| 5374162 |
wild celery |
Cyclospermum leptophyllum |
flower and fruit |
| 5374115 |
crystalline iceplant |
Mesembryanthemum crystallinum |
papillae on stem and petiole |
| 5374258 |
corn chamomile |
Anthemis arvensis |
stem and foliage |
| 5374200 |
fennel |
Foeniculum vulgare |
base of plant and foliage |
| 5374172 |
hedgeparsley |
Torilis arvensis |
foliage and fruit |
| 5374148 |
Pacific poison-oak |
Toxicodendron diversilobum |
foliage and fruit |
| 5374129 |
spiny amaranth |
Amaranthus spinosus |
stem and thorns |
| 5374123 |
prostrate pigweed |
Amaranthus blitoides |
|
| 5370203 |
Asiatic dayflower |
Commelina communis |
rooting at nodes |
| 5276064 |
narrow swordfern |
Nephrolepis cordifolia |
Scaly tubers |
| 5330038 |
Chinese yam |
Dioscorea polystachya |
aerial tubers |
| 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. |
| 5358653 |
Dalmatian toadflax |
Linaria dalmatica |
View of Dalmatian toadflax (Linaria dalmatica) in bloom, showing characteristic clasping leaves and flower. |
| 5358652 |
Dalmatian toadflax |
Linaria dalmatica |
Close-up view of the inflorescence -- flowers and buds -- of Dalmatian toadflax (Linaria dalmatica). |
| 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"). |
| 1560160 |
white vervain |
Verbena urticifolia |
inflorescence |
| 1560006 |
common teasel |
Dipsacus fullonum |
seed head |
| 1551134 |
blackseed plantain |
Plantago rugelii |
base of plant |
| 1551083 |
prickly lettuce |
Lactuca serriola |
underside of leaf |
| 1551062 |
horsenettle |
Solanum carolinense |
petioles |
| 1550228 |
common pokeweed |
Phytolacca americana |
flowers and immature fruit |
| 1550135 |
wild garlic |
Allium vineale |
flowers and fruits |
| 1550128 |
wild garlic |
Allium vineale |
bulbs |
| 1556156 |
wild garlic |
Allium vineale |
bulb |
| 1550118 |
tawny daylily |
Hemerocallis fulva |
base of plant |
| 1559299 |
common St. Johnswort |
Hypericum perforatum |
pellucid dots |
| 1559232 |
water knotweed |
Polygonum amphibium |
|
| 1559223 |
water knotweed |
Polygonum amphibium |
without stipule |
| 1559222 |
water knotweed |
Polygonum amphibium |
stipule |
| 1559219 |
water knotweed |
Polygonum amphibium |
stipule |
| 1559220 |
water knotweed |
Polygonum amphibium |
stipule |
| 5362874 |
shepherd's-purse |
Capsella bursa-pastoris |
Flowers and developing seedpods of shepherd's purse (Capsella bursa-pastoris). |
| 1557256 |
common milkweed |
Asclepias syriaca |
venation and hairs on lower leaf surface. |
| 1558240 |
poison-hemlock |
Conium maculatum |
newly developing leaves. |
| 1558199 |
broadleaf plantain |
Plantago major |
venation |
| 1558178 |
blackseed plantain |
Plantago rugelii |
Base of plant |
| 1558102 |
wild onion |
Allium canadense |
base of plant and roots |
| 1556427 |
ground ivy |
Glechoma hederacea |
hairs on stem at leaf axil |
| 1556377 |
field horsetail |
Equisetum arvense |
close-up of where leaves join the stem |
| 1553214 |
spotted knapweed |
Centaurea stoebe ssp. micranthos |
seed head |
| 1553209 |
spotted joe pye weed |
Eupatoriadelphus maculatus |
leaf axils |
| 1553176 |
dandelion |
Taraxacum spp. |
seed head |
| 1553142 |
common burdock |
Arctium minus |
seed head |
| 5355098 |
perilla mint |
Perilla frutescens |
leaf axil, in flower |
| 5355099 |
perilla mint |
Perilla frutescens |
leaf axil |
| 1554299 |
common burdock |
Arctium minus |
seed heads |
| 1554300 |
common burdock |
Arctium minus |
seed heads |
| 1554288 |
common burdock |
Arctium minus |
capitula |
| 1554100 |
field bindweed |
Convolvulus arvensis |
cotyledons |
| 1554012 |
Jerusalem artichoke |
Helianthus tuberosus |
|
| 1551186 |
Canada thistle |
Cirsium arvense |
|
| 1551179 |
bull thistle |
Cirsium vulgare |
seed head |
| 1551177 |
bull thistle |
Cirsium vulgare |
leaf apex |
| 1551175 |
common teasel |
Dipsacus fullonum |
|
| 1551164 |
perennial sowthistle |
Sonchus arvensis |
leaf margin |
| 1551162 |
perennial sowthistle |
Sonchus arvensis |
leaf margin |
| 1551154 |
red sorrel |
Rumex acetosella |
|
| 1550159 |
broadleaf dock |
Rumex obtusifolius |
|
| 5270004 |
wild garlic |
Allium vineale |
Bulbs |
| 5275013 |
Black dog-strangling vine, black swallowwort |
Cynanchum louiseae |
Comparision of flowers of Cynanchum louiseae (top)
and Cynanchum rossicum |
| 5275018 |
Black dog-strangling vine, black swallowwort |
Cynanchum louiseae |
Twining vines |
| 5275021 |
dog-strangling vine, European swallowwort |
Cynanchum rossicum |
Comparision of flowers of Cynanchum louiseae (top)
and Cynanchum rossicum (bottom) |
| 5273033 |
ground ivy |
Glechoma hederacea |
Vegetative spread |
| 5272015 |
giant hogweed |
Heracleum mantegazzianum |
Stem cross-section |
| 5274006 |
curlyleaf pondweed |
Potamogeton crispus |
Turion |
| 5271020 |
greater celandine |
Chelidonium majus |
Broken stem with orange sap |
| 5178014 |
Japanese knotweed |
Fallopia japonica |
rooted into a wall |
| 5178015 |
Japanese knotweed |
Fallopia japonica |
new shoots forming |
| 5159075 |
turkeyberry |
Solanum torvum |
leaves and immature fruits |
| 5160048 |
winged yam |
Dioscorea alata |
wings on stem |
| 5161004 |
bull thistle |
Cirsium vulgare |
prickles |
| 5161058 |
common mullein |
Verbascum thapsus |
strange growth |
