204- BORRAGINACEAE 465 



17. Corolla with contorted aestivation, blue red or white. Inflorescence with 



bracts at the base or without bracts. — Species 15. North and South 

 Africa and mountains of Central Africa. Used as ornamental or medicinai 



plants. " Forget-me-not." Myosotis L. 



Corolla with quincuncially imbricate aestivation 18 



18. Anthers ending in a long point. Stigma entire 19 



Anthers blunt or shortly pointed 20 



19. Anthers oblong, with a very long point. Filaments with a pouch-shaped 



appendage at the back. Corolla-lobes long. — Species i. Island of 



Socotra Cystistemon Balf. fil. 



Anthers hnear-sagittate. Filaments without an appendage at the back» 

 Corolla-lobes very short. Corolla yellow, white, or red. — Species 4. 

 North Africa. Used as ornamental, medicinal, and dye-plants. (In- 

 cluding Podonosma Guerke) Onosma L. 



20. Corolla-tube with a glandular ring at the base. Corolla yellow or violet. 



Style 2 — 4-cleft. — Species 5. North Africa and northern Central 

 Africa. Some species are used as ornamental or dye-plants. 



Arnebia Forsk. 

 Corolla-tube without a glandular ring 21 



21. Corolla with long and dense hairs, but without scales at the throat. Fila- 



ments as long as the anthers. Stigma i, almost entire. Low shrubs 

 or undershrubs. — Species 2. East Africa (Somaliland). 



Sericostoma Stocks 



Corolla with hollow scales, folds, or thin hairs at the throat. Stigmas 2, 



more or less distinct. — Species 15. South, North, and East Africa. 



Used for dyeing and in medicine. " Gromwell." Lithospermum L. 



22. (15.) Calyx shortly lobed or cleft half-way down, enlarged in the fruit. 



Corolla-tube cylindrical, with scales on the inside. Style simple with a 

 2-parted stigma, or 2-cleft. — Species 5. North Africa. 



Nonnea Medik. 

 Calyx deeply divided. Stigma usually entire 23 



23. Corolla rotate ; tube short, bearing hollow scales on the inner face. Fila- 



ments appendaged on the back. — Species 2. North Africa. They are 

 used as pot-herbs or as ornamental or medicinal plants. " Borage." 



Borrago L. 

 Corolla more or less tubular. Filaments unappendaged on the back. . 24 



24. Corolla without hollow scales at the throat, but sometimes with small 



scales in the lower part of the tube. — Species 2. North Africa. They 



yield a dye and medicaments Alkanna Tausch. 



Corolla with hollow scales at the throat 25 



25. Corolla with long narrow scales at the throat ; lobes very short. — Species 



2. Naturalized in North Africa. They serve as vegetables or as 



medicinal or dye-plants. " Comfrey." .... Symphytum L. 



Corolla with short scales at the throat. — Species 15. North Africa to 



Abyssinia and South Africa. Some species serve as vegetables or as 



2G 



