Aufzählung und Beschreibung der Acacien-Arten des Nilgebiets

"L'espionne" by Ernest Daudet is a scientific publication written in the late 19th century. It reads as a meticulous botanical monograph focused on the acacias of the Nile and Red Sea regions, outlining how to identify species, understand their variability, and map their distribution. The opening of the work sets out a field botanist’s rationale and method: after finding existing herbaria and literature insufficient, he concentrates on living, woody acacias encountered from Egypt into Nubia and Abyssinia, learning their forms, spines, bark, leaves, and pods in situ. He emphasizes how climate, season, and even the position of a twig on a tree alter diagnostic traits, warns against over-splitting species based on variable features, and highlights the value of stem architecture, rind, and gland placement on leaf petioles. A table summarizes ranges for leaflet pairs and glands across species, and notes on local Arabic and Bega names show how vernacular usage diverges from earlier authorities. A formal Latin key (Clavis Acaciarum Niloticarum) then divides the group and leads into concise species accounts—A. abyssinica, spirocarpa (with minor/major forms), tortilis, xiphocarpa, etbaica, nilotica, an arabica variant, nubica (two forms), verugera, fistula, and Seyal—each with brief morphology, habitat, local names, and striking traits (e.g., spiral vs. straight pods, fixed vs. sliding bract collars, extraordinary spines, and in A. fistula, insect-swollen thorns that whistle in the wind). (This is an automatically generated summary.)