Abstract
During the preparation of the Vascular Flora of the Marquesas Islands four new species of Bidens (Coreopsideae, Asteraceae) have come to light and are described herein: Bidens woodii W.L. Wagner, J.R. Clark & Lorence, sp. nov. from Ua Pou, and Bidens microcephala W.L. Wagner, J.R. Clark & Lorence sp. nov., Bidens evapelliana W.L. Wagner, J.R. Clark & Lorence, sp. nov., and Bidens wichmanii W.L. Wagner, J.R. Clark & Lorence, sp. nov. from the undercollected island of Fatu Hiva. In addition to these new species, we recognize the following six species of Bidens previously described from the Marquesas Islands: Bidens beckiana (F. Br.) Sherff (Eiao and Hatutaa), Bidens bipontina Sherff and Bidens cordifolia Sch. Bip. (both in Nuku Hiva), Bidens henryi Sherff (Hiva Oa, Tahuata), Bidens uapensis (F. Br.) Sherff (Ua Pou), and Bidens polycephala Sch. Bip. (Nuku Hiva, Ua Huku, Hiva Oa, Tahuata, and Mohotani). Two names are reduced to synonymy under Bidens polycephala: Bidens collina Degener & Sherff, syn. nov. and Bidens jardinii Sch. Bip., syn. nov. Bidens polycephala has the widest distribution of the Marquesan species on five of the islands and exhibits considerable variation.
Highlights
The Flora of the Marquesas Islands project is a collaborative program, primarily between the Smithsonian Institution and the National Tropical Botanical Garden, intended to further knowledge of the flora of this remote archipelago
It is similar to Bidens henryi but differs in having much shorter involucral bracts and in the large but variable number of heads among individuals, and it occupies drier and lower elevation habitats
Some of the collections of this species from Nuku Hiva seem to grade toward B. bipontina as they have more caudate leaf apices and longer rays (e.g., Florence 4332, 4353, and 4390 from Toovii Plateau area) than collections from other areas of Nuku Hiva and other islands
Summary
The Flora of the Marquesas Islands project is a collaborative program, primarily between the Smithsonian Institution and the National Tropical Botanical Garden, intended to further knowledge of the flora of this remote archipelago. Additional names in Bidens from the Marquesas are Bidens hivoana Degener & Sherff (1934), described from the island of Hiva Oa, and Bidens teikiteetinii Florence and Stuessy (1988) With subsequent study both have been transferred to Oparanthus (Shannon and Wagner 1997). Marquesan species of Bidens meet these IUCN criteria by having known ranges less than 100 km, an area of occupancy of less than 10 km, and continuing decline in the quality of habitat across the Marquesas Islands. 61 km2) is restricted to mountain slopes and summits, indicated as an endangered environment that is threatened by human activity (deforestation and fire), feral animals, and invasive plants, reducing the extent of the forest It is relatively common locally in some areas, and vulnerable (VU) might be an alternative category Summit area and along trail from road cut, 732 m, 9°46"10'S/138°58"31.4'W, 19 Jul 2004, Perlman & Wood 19207 (BISH, P, PAP, PTBG, US)
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
