Tristicha trifaria (Bory ex Willd.) Spreng., Systema Vegetabilium 1 (1824)

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

41. Tristicha trifaria (Bory ex Willd.) Spreng., Systema Vegetabilium 1 (1824)

Dufourea boryi A.Rich., Dict. Class. Hist. Nat. 5: 636 (1824)

Dufourea hypnoides St-Hil. Mém. Mus. Hist. Nat. 10: 472 (1823)

Dufourea trifaria Bory ex Willd., Sp. Pl., ed. 4 5(1): 55 (1810)

Dufourea alternifolia Willd., Mag. Neuesten Entdeck. Gesammten Naturk. Ges. Naturf. Freunde Berlin 6: 64 (1812)

Tristicha alternifolia Thouars ex Spreng., Syst. Veg. ed. 16(1): 22 (1824)

Tristicha alternifolia Thouars, ex Roem. & Schult. Syst. Veg. i. 50 (1817)

Type.

Mauritius, Bory de St Vincent s.n. (holotype: B; isotype: P).

Specimens examined.

8 km south of Kribi, Lobe waterfall, J.J. Bos 3593 (YA); Vina waterfall, near Ngaoundere, Feb, Dulieu 5 (ALF); Hossere Koum, 40 km west of Tchollire, Nov, Fotius 2418 (P); Limbe (Joke River), Mar, Brenen 9495, 9496 (BR, COL, P, SRGH); 8 km North Betare Oya (Mari River fall), Nov, Leeuwenberg 7767 (P, WAG); Roua 20 km northeast of Mokolo, Oct, R. Letouzey 7280 (P); Sahe, 3 km southwest of Nkondjok (Bafang - Yabassi Road), Nkam River, Feb, R. Letouzey 11145 (P).

Habitat.

River rapids and waterfalls.

Distribution.

AFRICA; Angola, Benin, Burkina Faso, Cameroon (Fig. 25 ), Cote d’Ivoire, Democratic Republic of Congo, Ethiopia, Ghana, Guinea, Kenya, Liberia, Madagascar, Malawi, Mali, Mauritius, Mascarene Islands, Mozambique, Namibia, Niger, Nigeria, Senegal, Sierra Leone, South Africa, Sudan, Tanzania, Togo, Uganda, Zambia, Zimbabwe. CENTRAL AND SOUTH AMERICA; Argentina, Brazil, Columbia, Costa Rica, Cuba, El Salvador, Guatemala, Mexico, Nicaragua, Panama, Paraguay, Uruguay, Venezuela.

Conservation status in Cameroon.

Tristicha trifaria is not listed on www.iucnredlist.org. The extent of occurrence of T. trifaria is about 12,000 km2 and the area of occupancy is about 28 km2. The taxon is currently known from about 7 localities. Lobe area, one of the localities where the species is found is a famous touristic site. Also agricultural activities are on the increase in other localities. Based on these threats, the number of localities and the continuous decline of vegetation cover in the area, extent and /or quality of the habitat, T. trifaria is here assessed as Vulnerable. IUCN Red List Category: Vulnerable VUB1 + 2ab (ii, 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.