Bidens acuticaulis
From Wikipedia, the free encyclopedia
| Bidens acuticaulis | |
|---|---|
Scientific classification  | |
| Kingdom: | Plantae |
| Clade: | Tracheophytes |
| Clade: | Angiosperms |
| Clade: | Eudicots |
| Clade: | Asterids |
| Order: | Asterales |
| Family: | Asteraceae |
| Genus: | Bidens |
| Species: | B. acuticaulis |
| Binomial name | |
| Bidens acuticaulis Sherff | |
| Varieties[1] | |
| |
| Synonyms[2][3] | |
| |
Bidens acuticaulis is an annual herbaceous flowering plant in the family Asteraceae. It is found in parts of tropical Africa (from the Democratic Republic of the Congo to Mozambique). There are two currently accepted varieties of this species – B. acuticaulis var. acuticaulis, and B. acuticaulis var. filirostris.
Bidens acuticaulis is an annual herbaceous flowering plant that grows a reddish erect stem up to a metre tall. The leaves are 2–13 cm (0.79–5.12 in) long and up to 6 cm wide, and are once or twice pinnately divided.
Flower heads contain both ray florets and disc florets. The flower heads are held singly on peduncles up to 15 cm long. Each flower head contains involucres that are up to 8 mm long, which lengthen up to 13 mm when the head is fruiting.
The ray florets are yellow, with the upper part being paler than the rest of the floret. The rays are 6–7 mm long by up to 1.5 mm wide. The disc florets are yellow, and are shaped like a bell.
The fruits are black or dark brown achenes that are narrowly ellipsoid, with closely pressed hairs. The achenes contain beaks that are between 2.5 and 24 cm long, depending on the botanical variety.[4]