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| '''''Bidens acuticaulis''''' is an ] ] ] in the family ]. 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 |
'''''Bidens acuticaulis''''' is an ] ] ] in the family ]. 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''. | ||
| ==Description== | ==Description== | ||
| Line 29: | Line 29: | ||
| ==Distribution== | ==Distribution== | ||
| ''Bidens acuticaulis'' grows in parts of central ] (Angola, Democratic Republic of the Congo, Malawi, Mozambique, Tanzania, Zambia). The varieties of ''Bidens acuticaulis'' grow in different locations |
''Bidens acuticaulis'' grows in parts of central ] (Angola, Democratic Republic of the Congo, Malawi, Mozambique, Tanzania, Zambia). The varieties of ''Bidens acuticaulis'' grow in different locations – var. ''filirostris'' grows in Angola, Tanzania and Zambia while var. ''acuticaulis'' grows throughout the entirety of the species' distribution.<ref name=POWOac /><ref name=POWOfi /> | ||
| ==Taxonomy== | ==Taxonomy== | ||
| ''Bidens acuticaulis'' was first formally named and described by Earl Edward Sherff in 1915 in the ] journal.<ref name=POWO /><ref name="DESPaper">{{Cite journal |last=Sherff |first=Earl E. |date=1915 |title=STUDIES IN THE GENUS ''BIDENS'' |url=https://www.biodiversitylibrary.org/page/35191610#page/327/mode/1up |journal=] |volume=59 |page=301 |via=]}}</ref> | ''Bidens acuticaulis'' was first formally named and described by Earl Edward Sherff in 1915 in the ] journal.<ref name=POWO /><ref name="DESPaper">{{Cite journal |last=Sherff |first=Earl E. |date=1915 |title=STUDIES IN THE GENUS ''BIDENS'' |url=https://www.biodiversitylibrary.org/page/35191610#page/327/mode/1up |journal=] |volume=59 |page=301 |via=]}}</ref> | ||
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| * ''B. acuticaulis'' var. ''filirostris'' {{Small|(P.Taylor) T.G.J.Rayner}} | * ''B. acuticaulis'' var. ''filirostris'' {{Small|(P.Taylor) T.G.J.Rayner}} | ||
| When ] (a botanist) reduced ''Bidens paupercula'' {{Small|Sherff}} to a synonym under ''Bidens acuticaulis'' in 1992, the variety ''B. p.'' var. ''filirostris'' had to be renamed to ''Bidens acuticaulis'' var. ''filirostris''. The main difference that separates var. ''filirostris'' from var. ''acuticaulis'' is the beaks on the achenes |
When ] (a botanist) reduced ''Bidens paupercula'' {{Small|Sherff}} to a synonym under ''Bidens acuticaulis'' in 1992, the variety ''B. p.'' var. ''filirostris'' had to be renamed to ''Bidens acuticaulis'' var. ''filirostris''. The main difference that separates var. ''filirostris'' from var. ''acuticaulis'' is the beaks on the achenes – var. ''filirostris'' plants have beaks up to 24–26 cm long, while var. ''acuticaulis'' plants have beaks up to 2.5 cm long.<ref name="FTEA" /><ref>{{Cite journal |last=Rayner |first=T.G.J. |date=1992 |title=STUDIES ON THE GENUS ''BIDENS'' L. (COMPOSITAE) FROM THE EASTERN HEMISPHERE. 2. NEW COMBINATIONS AND A NEW SUBSPECIES FOR THE FLORA OF TROPICAL EAST AFRICA AREA |url=https://www.biodiversitylibrary.org/page/13157836#page/27/mode/1up |journal=] |volume=72 |issue=2 |page=101 |via=]}}</ref> | ||
| ==References== | ==References== | ||
Revision as of 17:14, 3 January 2025
Species of flowering plant
| 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 | |
| |
| Synonyms | |
| |
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.
Description
Bidens acuticaulis is an annual herbaceous flowering plant that grows an 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 2.5–24 cm long, depending on the botanical variety.
Distribution
Bidens acuticaulis grows in parts of central Tropical Africa (Angola, Democratic Republic of the Congo, Malawi, Mozambique, Tanzania, Zambia). The varieties of Bidens acuticaulis grow in different locations – var. filirostris grows in Angola, Tanzania and Zambia while var. acuticaulis grows throughout the entirety of the species' distribution.
Taxonomy
Bidens acuticaulis was first formally named and described by Earl Edward Sherff in 1915 in the Botanical Gazette journal.
Varieties
As of January 2025, Plants of the World Online accepted two varieties for this species;
- B. acuticaulis var. acuticaulis autonym
- B. acuticaulis var. filirostris (P.Taylor) T.G.J.Rayner
When Timothy Guy Johnson Rayner (a botanist) reduced Bidens paupercula Sherff to a synonym under Bidens acuticaulis in 1992, the variety B. p. var. filirostris had to be renamed to Bidens acuticaulis var. filirostris. The main difference that separates var. filirostris from var. acuticaulis is the beaks on the achenes – var. filirostris plants have beaks up to 24–26 cm long, while var. acuticaulis plants have beaks up to 2.5 cm long.
References
- ^ "Bidens acuticaulis Sherff | Plants of the World Online | Kew Science". Plants of the World Online. Royal Botanic Gardens, Kew. Retrieved 2 January 2025.
- ^ "Bidens acuticaulis var. acuticaulis | Plants of the World Online | Kew Science". Plants of the World Online. Royal Botanic Gardens, Kew. Retrieved 2 January 2024.
- ^ "Bidens acuticaulis var. filirostris (P.Taylor) T.G.J.Rayner | Plants of the World Online | Kew Science". Plants of the World Online. Royal Botanic Gardens, Kew. Retrieved 2 January 2025.
- ^ Beentje, H.; Jeffrey, C.; Hind, D.J.N. (2005). Flora of Tropical East Africa, part 3. p. 547.
- Sherff, Earl E. (1915). "STUDIES IN THE GENUS BIDENS". Botanical Gazette. 59: 301 – via Biodiversity Heritage Library.
- Rayner, T.G.J. (1992). "STUDIES ON THE GENUS BIDENS L. (COMPOSITAE) FROM THE EASTERN HEMISPHERE. 2. NEW COMBINATIONS AND A NEW SUBSPECIES FOR THE FLORA OF TROPICAL EAST AFRICA AREA". Phytologia. 72 (2): 101 – via Biodiversity Heritage Library.
| Taxon identifiers | |
|---|---|
| Bidens acuticaulis | |