Bidens woodii
| Notice: | This page is derived from the original publication listed below, whose author(s) should always be credited. Further contributors may edit and improve the content of this page and, consequently, need to be credited as well (see page history). Any assessment of factual correctness requires a careful review of the original article as well as of subsequent contributions.
If you are uncertain whether your planned contribution is correct or not, we suggest that you use the associated discussion page instead of editing the page directly. This page should be cited as follows (rationale):
Citation formats to copy and paste
BibTeX: @article{Wagner2014PhytoKeys38, RIS/ Endnote: TY - JOUR Wikipedia/ Citizendium: <ref name="Wagner2014PhytoKeys38">{{Citation See also the citation download page at the journal. |
Ordo: Asterales
Familia: Asteraceae
Genus: Bidens
Name
Bidens woodii W.L. Wagner, J.R. Clark & Lorence sp. nov. – Wikispecies link – IPNI link – Pensoft Profile
Type
Marquesas Islands. Ua Pou: Central Ua Pou including the summit crest regions around Oave and the nearby peak of Matahenua, 899–924 m, 9°23"S/140°4"W, 2 Jul 2004, Wood & Perlman 10806 (holotype: US-3547652; isotypes: BISH, P, PAP, PTBG) [used in molecular study, Funk et al.].
Description
Erect, suffrutescent perennial herbs 0.5–1 m tall. Leaves simple, 5–7 cm long including petiole, petiole stout, blades thick and coriaceous, ovate to broadly ovate, 3–4.5 × 1.8–2.5 cm, glabrous, the veins on lower surface conspicuously raised, margins serrate, apex short-acuminate. Heads 1–2, in compact cymes terminating main stem and lateral branches, 4–5 mm in diameter excluding rays, peduncles ca. 2 cm long, stout, glabrous; outer involucral bracts ca. 3–4 mm long, broad, well differentiated from inner bracts; inner bracts dark purple, erose and with a few short hairs; ray florets ca. 6–8, sterile, rays yellow, obovate, 10–12 × 4–7 mm, apices often bi- or tri-lobed; disk florets ca. 30–34, perfect, corollas yellow; pappus absent. Achenes not seen.
Distribution
Marquesas Islands, Ua Pou, known only from the type on the summit crest around Oave and the nearby peak of Matahenua, ca. 920 m.
Habitat
Occurs in low shrubland of Metrosideros collina with Dicranopteris linearis on the windswept and cloud-shrouded summit area.
Etymology
This new species is named for Kenneth R. Wood, who made the only known collection of it and who has contributed greatly to our knowledge of the flora of the Marquesas and Hawaii through his collections, excellent photography, and field observations.
Conservation status
IUCN Red List Category Endangered (EN), criteria B2a, B2b i-iii: B2, total area of occupancy less than 500 km² (c. 50 km²); B2a, fragmented populations; b (i-iii), habitat continuing decline inferred. The suitable habitat for Bidens woodii on Ua Pou (c. 105 km²) is indicated as an endangered environment, threatened by human activity (deforestation, fire), feral animals, and invasive plants, thus reducing the extent of the suitable habitat.
Discussion
Bidens woodii is most similar to Bidens evapelliana but can be differentiated by its habit (erect versus prostrate, and 0.5–1 m versus 0.3–0.5 m tall stem), leaves with raised venation, and obovate rays. It is known only from the type collection.
Original Description
- Wagner, W; Clark, J; Lorence, D; 2014: Revision of endemic Marquesas Islands Bidens (Asteraceae, Coreopsideae) PhytoKeys, 38: 37-67. doi
Images
|
