Thlaspi arvense (Field pennycress)
Image credit: Alysha ColangeliIdentification tips
Tip #1: This mustard family takes a hard time inventing a tip on how to decorate the name, but the genre comes from the Greek thlaein, "crush", "flattened" which is the characteristic of the fruits of this species and the species comes from Latin and means from the field.
Plant shape
2º Identification tip: the plant has its development in the shape of a rosette, can have only one stem or multiple, does not have hair on the stems and leaves.
Leaves
3º Identification tip: as well as almost all plants of the family of mustard leaves despite the character of the family, it is not a good parameter to identify because it has different forms and can present petiole when in a rosette and present sessile leaves (coming straight from the stem).
Stem
4º Identification tip: the main one leaves the center of the rosette, and from it can present new stems and/or new stems appear from the lateral buds of the rosette. The stems have ribs highlighted around it, forming as if they were stripes that stand out on the stem.
Flowers
5º Identification tip: flowers do not facilitate identification, they present in a round cluster, each flower has four white petals.
Pod
6º Identification tip: pods are the main characteristic for identification, they give the name to the gene, are flattened. Initially, it has a green heart shape, then have pale wing shape.
Seeds
7º Identification tip: the seeds are certainly the characteristic that allows rapid identification of the species since the seeds have a digital pattern in it.
Seedlings - the terror of all
8º Identification tip: the cotyledon is quite oblong, the true leaves have very elongated petiole and oblong leaves.
this plant has a very astringent aroma (nothing pleasant), garlic armoa, this aroma can be highlighted when kneaded leaves and stem, helping in identifying it.
Extra references:
https://www.minnesotawildflowers.info/flower/field-pennycress
http://florafinder.com/Species/Thlaspi_arvense.php
https://www.invasiveplantatlas.org/subject.html?sub=6524
https://www.cabi.org/isc/datasheet/27595
http://www.luontoportti.com/suomi/en/kukkakasvit/field-pennycress