Bidens biternata
Description 2
Erect annual herb, up to 1 m. It can be distinguished by the leaves, which are usually 5-7 foliolate, the basal pair sometimes further divided. The flowers are yellow, including the ray-florets. In B. pilosa, the leaves are 3-foliolate and the ray-florets, if present, are white. B. biternata is much less frequent in occurrence.
Diagnostic 3
"Erect subshrubs; stem ribbed. Leaves pinnate or bipinnate, to 16 cm long; leaflets 6-8 x 3 cm, ovate, acuminate, serrate. Heads 18-20 mm long, oblong, in loose corymbose cymes or solitary; bracts 8 x 2 mm, 2-seriate, oblong, acute; outer ones ciliate. Flowers outer whorl ligulate; limb 5 x 3 mm, oblong, 3-lobed, white. Inner flowers bisexual; corolla tubular, 5-lobed, yellow, lobes obtuse; anthers obtuse at base. Achenes 16 mm long, linear, glabrous; pappus 3, retrorsely barbed, spinescent."
Sources and Credits
- (c) Mark Hyde, Bart Wursten and Petra Ballings, some rights reserved (CC BY-NC), https://www.zimbabweflora.co.zw/speciesdata/images/16/160610-2.jpg
- (c) Mark Hyde, Bart Wursten and Petra Ballings, some rights reserved (CC BY-NC), http://eol.org/data_objects/30290517
- (c) India Biodiversity Portal, some rights reserved (CC BY), http://eol.org/data_objects/26332908
More Info
- iNat taxon page
- African Plants - a photo guide
- Atlas of Living Australia
- Biodiversity Heritage Library
- BOLD Systems BIN search
- eFloras.org
- Global Biodiversity Information Facility (GBIF)
- HOSTS - a Database of the World's Lepidopteran Hostplants
- IPNI (with links to POWO, WFO, and BHL)
- SEINet Symbiota portals
- Tropicos
- World Flora Online
- 日本のレッドデータ検索システム
- 植物和名−学名インデックス YList
