Calvoa stenophylla Jacq.- Fel ., Bull. Mus. Natl. Hist. Nat., B, Adansonia Ser . 4, 3(2): 143 (1981)

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

Calvoa stenophylla Jacq.- Fel., Bull. Mus. Natl. Hist. Nat., B, Adansonia Ser. 4, 3(2): 143 (1981)

Type.

Cameroon, 10 km Southeast of Zingui, 16 Mar 1968, R. Letouzey 9083. (Holotype: P; isotype: YA).

Description.

Small herb, about 20 cm high; stem flexible; roots spreading and fibrous; leaves narrow-lanceolate 4-6 × 0.2-0.5 cm; flowers terminal, pink.

Specimen examined.

Minsomo River, 10 km southeast of Zingui, 2°56'N, 9°54'E, 16 Mar 1968, R. Letouzey 9083 (YA).

Habitat.

Rocks on bed of Minsomo River.

Distribution.

Cameroon (Fig. 13 ) and Equatorial Guinea.

Conservation status in Cameroon.

Calvoa stenophylla is listed on http://www.iucnredlist.org as Endangered ( Cheek 2015). The species was assessed as Critically Endangered ( Onana and Cheek 2011), since it was known from only one locality and the associated threats at the time. Cheek (2015) reassessed the species, globally as Endangered, since the number of localities has increased to two, and area of occupancy of 8 km2. The second locality is in Equatorial Guinea ( Cheek 2015). In Cameroon, the species is only known from one locality and the area of occupancy is about 4 km2. The extent of occurrence (EOO) is estimated at 1 km2, following the IUCN preferred grid cell size for aquatic organisms ( IUCN 2013, 2017). This was used by Cheek et al. (2015) in assessing the conservation status of Ledermanniella lunda Cheek ( Podostemaceae ) from Angola. The main threats are forest logging and agriculture activities. Based on these threats, and the continuous decline of vegetation in the area, extent and /or quality of habitat C. stenophylla is here assessed, as Critically Endangered. IUCN Red List Category: Critically Endangered CRB2ab (ii, iii).

Figures

Figures 11 - 19. 11 Cyperus cataractarum K. Schum ex Engl. 12 Plectranthus cataractarum B. J. Pollard 13 Calvoa stenophylla Jacq. - Fel. 14 Eugenia dusenii Engl. 15 Biophytum talbotii (Baker f.) Hutch. & Dalziel 16 Biophytum zenkeri Guillaumin 17 Pandanus satabiei Huynh 18 Eragrostis barteri C. E. Hubb. 19 Ixora euosmia K. Schum.