Artemisia biennis (Biennial wormwood)

Identification tips

Tip #1: genus Artemisia via Latin from Greek, 'wormwood', in honor of the goddess Artemis,to whom it was sacred, biannual biennis.

Plant shape

2º Identification tip: artemisia biennis grows slowly after emergence, remaining as a rosette until summer, when plants shoot and growth becomes rapid.

Leaves

3º Identification tip: the leaves do not have pandthem and have yielded margins, quite thin, which helps in identifying when separated with Common ragweed.

Artemisia biennis left and artemisiifolia artemisiifolia

Stem

4º Identification tip: the stems do not have pandthem, they are green and can be reddish.

Flowers

5º Identification tip: the flowers are arranged in the shape of a spikelet, with round yellowish flowers.

Seeds

6º Identification tip: the seeds are numerous and very small.

Seedlings - the terror of all

7º Identification tip: the cotyledons are round and small, are confused with the first true leaf, because it does not have the pattern of the rest of the true leaves. The first true leaf, is long oval and with tips, forming something similar to a trident.

ID

Control

More images

Other Uses

Extra reference:

https://www.ag.ndsu.edu/weeds/ndsu-ext-pubs/w1322.pdf

https://www.minnesotawildflowers.info/flower/biennial-wormwood

https://gobotany.nativeplanttrust.org/species/artemisia/biennis/