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The shrubby, spiny, succulent species Euphorbia collenetteae D.Al-Zahrani & El-Karemy (Euphorbiaceae) from the southern Red Sea coast and islands is described and illustrated as new. Diagnostic characters, a description and taxonomic comments on the species are given. It is compared with the closely related Euphorbia fractiflexa S.Carter & J.R.I.Wood. The geographical distribution of the new species is shown.

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The present study deals with the vegetation of Baha plateau (19°50′–20°18′N, 41°38′–42°10′E), with elevation ranging between 1700 and 2400 m. Ten plant communities are recorded: communities dominated by trees (Acacia negrii and Juniperus excelsa); communities dominated by shrubs and undershrubs (Acacia tortiiis, Olea europaea, Dodonaea viscosa, Pulicaria crispa, Rumex limoniastrum and Astragalus atropilosus); communities dominated by grasses (Hyparrhenia hirta) and a community dominated by ephemerals (Achillea biebersteinii – Cardaria draba). 167 species of vascular plants are recorded. Relations between communities and their habitat types as well as the human impact in the area are briefly discussed.

A systematic revision of the Egyptian species of the family Primulaceae was carried out. It reveals the presence of the following taxa: Primula boveana L., Asterolinon linum‐stellatum (L.) DUBY, Anagalis arvensis L. var. arvensis, A. arvensis L. var. caerulea (L.) GOUAN, A. arvensis L. var. latifolia (L.) LANGE, Samolus valerandi L. and Coris monspeliensis L. subsp. strossiae GAUBA. Of these A. arvensis L. var. caerulea (L.) GOUAN is a new record to the flora of Egypt. A key, synonyms and notes on distribution are provided. SEM features of the seed coat and leaf epidermis viz. of the cell patterns, anticlinal cell boundaries and the periclinal cell wall were also examined and proved their taxonomic significances.