Forsskaolea tenacissima is a member of the non-stinging nettles genus Forsskaolea and is in the same family as the stinging kind, Urticaceae. Described as "looking like a tough character that does not want or need a caress", F. tenacissima makes its home where not many plant species survive, in stony soils, road edges, in the gravel wadi and "in the rock crevices and water-receiving depressions" above the stone pavements of the Hamadas.
Forsskaolea tenacissima was named in mourning of a student of Carolus Linnaeus, a Swede named Peter Forsskål, who died while gathering botanical and zoological specimens from the Arabia Felix. Linnaeus named this plant Forsskaolea tenacissima because the plant was as stubborn and persistent as the student had been.
Description
The almost upright 65 centimetres (26 in) fleshy, stiff-haired, woody annualF. tenacissima appears after the rains in rocky and difficult to grow in places like the Sahel of Mauritania, and Northeast Africa (the Horn of Africa), and now recorded in Niger. It is a chamaephyte that is much relished by the stock and wild animals who graze on it in the Saharo-Arabian.
Leaves and stems
5 millimetres (0.20 in) to 20 millimetres (0.79 in) leaf stalks. Broad-side of leaves are squared-oval to round 1 centimetre (0.39 in) to 5 centimetres (2.0 in) long and 1 centimetre (0.39 in) to 7 centimetres (2.8 in) wide. Upper leaf surfaces have straight and hooked hairs and the lower leaf is densely white-wooly with hair. Small leafy outgrowth at the base of the leaf are rounded, 3 millimetres (0.12 in) to 5 millimetres (0.20 in) long, 1.5 millimetres (0.059 in) to 2.5 millimetres (0.098 in) wide, persistent and dry—not green.
Flowers
Five involucral bracts narrow and tapering to a point, 5 millimetres (0.20 in) to 6 millimetres (0.24 in) long and densely wooly. Four to eight male flowers and two to six female flowers in the center of the flower head which is attached right to the stem. Three unequal sepals; 3 millimetres (0.12 in) long stamen with a pointy anther and a conical 2 millimetres (0.079 in) long ovary which is surrounded with dense wool. The stigma is as long as the ovary.
Seeds
Achenes are elliptical, reddish-brown and 2 millimetres (0.079 in) long.
Communities
In Spain, F. tenacissima has been observed in a phytosociological situation (made "on the rocks" or in the gravel wadis of Tabernas Desert) with Senecio flavus.
F. tenacissima has been observed living low in wadis with these plant species:
Acacia tortilis
Aerva javanica
Lotononis platycarpa
Farsetia longisiliqua
It has also been found growing in rock crevices and water-receiving depressions above the stone pavements of the Hamadas along with:
Common in arid and semi-arid waste lands in sandy clay gravelly soils from sea level to 1,200 metres (3,900 ft) like Mediterranean woodlands and shrublands, semi-steppe shrublands, shrub-steppes, deserts and extreme deserts.
