|
(Last Modified On 4/20/2022)
|
|
Acceptance
:
Accepted
|
|
(Last Modified On 5/31/2022)
|
|
Description
:
Slender herb with glabrous, creeping, and later erect stems rooting at the nodes. Leaves obovate, finely crenate, about 10 mm long and almost as wide with a 5 mm stalk. Flowers solitary terminal or axillary, 5-petalled, calyx lobes lanceolate, entirely hairless, petals oblong oval, 4 mm long. Fruits 3 mm long.
Herbe grêle à tige glabres, rampantes puis redressées s'enracinant aux nœuds. Feuilles obovales finement crénelées, d'environ 10 mm de long et presque autant de large avec un pétiole de 5 mm. Fleurs solitaires terminales ou axillaires à 5 pétales, lobes du calice lancéolés entièrement glabres, pétales ovales oblongs de 4 mm de long. Fruits de 3 mm de long.
|
|
Phenology
:
Flowers have been observed in May.
|
|
Habitat
:
Gallery forest, between 600 and 1,100 m in elevation.
|
|
Distribution
:
Guinée, Liberia
|
|
Distribution Note
:
The species is endemic to West Africa where it occurs in Guinea and Liberia. It is known from five collections made between 1837 and 1964. One collection was made in Fouta Djallon (Heudelot #858), and one in Koukouré near Kindia (Jacques-Félix #1668), as well as from the Nimba Mountains both in the Liberian side (Adames #573) and in the Guinean side (Schnell #3624 and #5041). One additional collection (Jacques-Félix #1668bis) is not taken into account in the assessment as it is a cultivated collection obtained from the specimen (Jacques-Félix #1668).
|
|
More literature
:
Adam, J.G., 1971. Flore descriptive des Monts Nimba. Muséum national d'Histoire naturelle, Paris, 6 tomes.
|
|
Zones Clés de Biodiversité
:
Monts Nimba (GIN9), Nimba Mountains (LBR12)
|
|
(Last Modified On 5/31/2022)
|
|
Red List Category
:
Endangered
|
|
Status of Conservation Assessment
:
Submitted to Red List
|
|
Date of assessment
:
11 August 2021
|
|
Assessment rationale
:
Guyonia tenella is a slender perennial herb growing in gallery forest. It is endemic to West Africa where it occurs in Guinea and Liberia. The species is known from five collections made between 1837 and 1964. The species is known from Fouta Djallon, from Koukouré near Kindia as well as from the Nimba Mountains, both on the Liberian side and on the Guinean side. The five collections represent five occurrences and three to five subpopulations. Based on a 2 × 2 km grid cell size, the AOO is estimated at 20 km2, below the upper threshold for the Endangered (EN) category under subcriterion B2. Due to uncertainty in the precise locality of the historical collections, its extent of occurrence (EOO) can only be roughly estimated as 50,000 km2, exceeding the upper threshold for the Vulnerable category under subcriterion B1. One occurrence located in Fouta Djallon is threatened by small-scale agriculture, which induces a decline in the extent and habitat quality. The occurrence located near Kindia is threatened by urban expansion, small-scale agriculture, and wood harvesting. Regarding the three occurrences in the Nimba Mountains, the one recorded from the Liberian side within the East Nimba National Park is threatened by the activities of a former iron-ore mining operation that has affected habitat quality. On the Guinean side, the occurrence near Nion is threatened by small-scale agriculture, and the one located “at the foot of Nimba NE”, probably within the Mount Nimba Strict Nature Reserve, seems not under threat. As a consequence, the five occurrences represent five locations (sensu IUCN 2019) with regard to the most serious plausible threats (small-scale agriculture). We infer a past, current, and future continuing decline in the quality of its habitat. Guyonia tenella is therefore assessed as EN B2ab(iii).
|
|
Disclaimer
:
This assessment was prepared on 11 August 2021. The map proposed below is only based on the specimens available on Tropicos, therefore, may not correspond to the information provided in the assessment rationale.
|
|
Conservation measures
:
The species is known from the East Nimba National Park in Liberia and the Mount Nimba Strict Nature Reserve in Guinea. Since Guyonia tenella is threatened by small-scale agriculture, wood harvesting, and mining activities, various conservation measures should be considered. First, it should be sought in other places, since it has not been recorded since 1964, to increase knowledge of its full distribution. Second, it should be regarded as an HCV1 (High Conservation Value), and as a consequence should be included in the management plan of the industrial concessions within which it occurs. Third, it should be included in the Guinean and Liberian lists of protected species, and the degradation or loss of its habitat must therefore be avoided. Fourth, ex-situ conservation should be tested, both within Guinea and Liberia, and internationally. Finally, a public awareness campaign must be conducted targeting industrial companies and other private actors, NGOs, scientific institutions, and the governments of Liberia and Guinea to ensure that G. tenella is taken into consideration when decisions are made that could impact its conservation.
|
|
|