Grewia erythraea generally inhabits hillsides (Jongbloed et al. 2003). This perennial shrub species has woody stems and can grow up to 150 cm in height (Jongbloed et al. 2003, Fawzi and Ksiksi 2012). It produces small white flowers between October and February in addition to producing a red berry fruit in 3-4 parts (Jongbloed et al. 2003). It is a characteristic species of the submontane zone which is dominated by grasses, herbs and subshrubs (Patzelt 2015).

This annual species has similar ecology to Geranium mascatense: it has round, lobed leaves and dark pink flowers with a black centre, which can be seen between February and May (Jongbloed et al. 2003). However, Geranium trilophum is thought to have larger flowers (Jongbloed et al. 2003). Similarly to G. mascatense, it may well inhabit gravel substrate, in addition to shady places within both wadis and plantations (Jongbloed et al. 2003). Within the Wadi Wurayah National Park, this species is known to grow on north-facing rubble slopes which are shaded by a cliff (Feulner 2016).

This annual herb species grows within sand and loamy soils, in addition gravel and shady places such as ravine beds (Feulner 2014, Mahmoud et al. 2018). It is also known to grow in plantation habitats (Jongbloed et al. 2003). The plant can reach up to 45 cm in width, has round, lobed leaves and produces dark pink flowers, with a black centre, between February and May (Jongbloed et al. 2003).

This species has been recorded from north-facing rubble slopes which are also shaded from a cliff (Feulner 2016). It is also known to grow within wadis, on wadi slopes and in silt terraces and gulleys, but appears to prefer sheltered damp sites (Feulner 2016). Its characteristic seed capsules have a 'beak' and curved horns (Feulner 2016).

This annual herb is found on hillsides and in wadis, in addition to plantations and lower hills (Jongbloed et al. 2003, MEW 2010).

This deciduous tree species can grow up to 8 m in height (Jongbloed et al. 2003, Feulner 2011). The trunk has distinctive almost-white bark and produces milky sap (Jongbloed et al. 2003). Its leaves vary in shape but are typically lobed, while fruit is produced between March and May and is purple when ripe (Jongbloed et al. 2003). It generally grows within plantation and mountain habitats, including rocky wadi slopes (Jongbloed et al. 2003, Feulner 2016).

This species is an annual or perennial herb that grows up to 0.5 m in height, found on sands and gravels (Jongbloed et al. 2003).

The species grows as a succulent shrub on rocky slopes and gravel terraces within montane habitats (Perry 2008, Feulner 2011, EAD 2018, Mahmoud et al. 2018). It is a perennial evergreen species which is present throughout spring and summer (Sturt and Stuart 1998, Fawzi and Ksiksi 2012). The lower stems of the plant are woody while the younger stems are bright green (Jongbloed et al. 2003). Round fruit is produced by the plant and it flowers between November to April (Jongbloed et al. 2003). Euphorbia larica is a characteristic species of rocky and stony slopes within the high Hajar Mountains, showing resistance to drought stress and acting as an indicator species for east-facing montane slopes (El-Kablway et al. 2016). It makes use of shallow, spreading roots which capture rain easily (Feulner 2016).

This annual herb species grows within wadis and gravel in low montane habitats (Jongbloed et al. 2003, Mahmoud et al. 2018). It can reach up to 20 cm in height and produces milky sap whenever the stems are broken or damaged (Jongbloed et al. 2003). The plant has linear leave with pointed tips and small white flowers which are present between February and April (Jongbloed et al. 2003).

It is a delicate annual grass that occurs on plantations, gardens, in irrigated places, sandy soils and urban areas (G. Brown pers. comm. 2019, Brown and Sakkir 2004, Jongbloed et al. 2003, MEW 2010).