Bidens cernua
- Overview
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- Biology
- Taxonomy
- Occurrence
- Specimen
Growing form
Annual herb.
Size
20–90 cm high.
Stem
The stem is typically light-colored and hispid.
Leaf
The leaf arrangement is opposite. The leaves are sessile and amplexicaul. The lamina is entire, lanceolate, attenuate, light-colored and scantily serrate with large teeth.
Flower
The capitula are 1.5–2.5 cm wide, wider than long, with a long peduncle and drooping. The involucre consists of two rows. There are typically 5–8 short outer phyllaries. The inner phyllaries are yellow and densely black-striate in the middle. Occasionally the capitula have deep yellow ray-florets with long and broad ligules. The receptacle scales are narrowly obovate.
Fruit and seed
The achene with its awns measures 6–8 mm. The achene is quadrate, light-colored, margins and awns covered with retrorse bristles, muricate, with three to four awns 2–4 mm long.
The map represents observations of this taxon, but it may not be used as a distribution map.
- Total squares
- nuokkurusokki (Finnish)
- nickskära (Swedish)
- AOV - spontaneous, old, resident
Vascular plants – SUMI Project 2022 ? Regionally Threatened 2020 - 3b Middle boreal, Northern Carelia–Kainuu ? Regionally Threatened 2020 - 3c Middle boreal, Southwestern Lapland ?
- 2019 LC – Least Concern
- 2010 LC – Least Concern
- 2000 LC – Least Concern
- Arto Kurtto
- Vascular plants
- Plant life forms
- Shore plants