Taraxacum officinale (Dandelion)
Identification tips
Tip #1: the genus name Taraxacum is derived from the Greek taraxos (disorder) and akos (remedy). And officinale indicates that this is an official remedy.
Plant shape
2º Identification tip: the plant has a rosette shape, possui yellow flowers that arise from a stem.
Leaves
3º Identification tip: the leaves form a dense rosette around the main root, have the shape of oblong boom with jagged edges, the tip of the sheet is more rounded. The leaves are usually hairy at the bottom, but can be totally smooth.
Stem
4º Identification tip: the stem eh present in flowering, it has no leaves and are hollow, at the apex is formed the flower. They as well as the central rib of the leaves have light green coloration and can be reddish.
Flowers
5º Identification tip: the flower is very dense with yellow petals.
Seeds
6º Identification tip: the brown eh seed and has a tuft of white hair at one end.
Seedlings - the terror of all
7º Identification tip: cotyledons are round and smooth edges, the first true leaves are lanceolate and the edges are toothed, as the leaves grow they become more lobed.
References
http://identifythatplant.com/dandelion-and-cats-ear/
https://www.minnesotawildflowers.info/flower/common-dandelion