Dicraeanthus zehnderi H.E.Hess, Ber. Geobot. Inst. Eidg. Techn. Hochsch. Stiftung Rŭbel Heft 32: 188 (1961)

Kuetegue, Felix, Sonke, Bonaventure & Ameka, Gabriel K., 2019, A checklist of rheophytes of Cameroon, PhytoKeys 121, pp. 81-131 : 81

2. Dicraeanthus zehnderi H.E.Hess, Ber. Geobot. Inst. Eidg. Techn. Hochsch. Stiftung Rŭbel Heft 32: 188 (1961)

Type.

Cameroon, Edea, 30 Jan 1951, Zehnder 259 (syntype: Z, ZT).

Specimens examined.

Edea at Sanaga waterfall, Zehnder 259, 260, 262 (ZT); Sanaga waterfalls, 30 Jan 1951, Hess 51 / 270 (ZT).

Habitat.

Growing in river rapids and waterfalls of Sanaga.

Distribution.

Cameroon (Fig. 25 ).

Conservation status in Cameroon.

Dicraeanthus zehnderi was listed on http://www.iucnredlist.org as Critically Endangered ( Ghogue 2010c). It was also assessed by Onana and Cheek (2011) as Critically Endangered since it has not been collected for many decades. The only known collecting locality for D. zehnderi is the waterfall on Sanaga River at Edea. The extent of occurrence and the area of occupancy are both estimated at 4 km2. The hydropower dam on the waterfall will adversely affect the survival of this species and other Podostemaceae species present at this locality. The taxon is here reassessed as Critically Endangered. IUCN Red List Category: Critically Endangered CRB1+2ab (iii).

Figures

Figures 20 - 25. 20 Ixora inundata Hiern 21 Virectaria angustifolia (Hiern) Bremek 22 Virectaria salicoides (C. H. Wright) Bremek 23 Deinbollia angustifolia D. W. Thomas 24 Deinbollia saligna Keay 25 Podostemaceae distribution.