ROSE FAMILY 



155 



Less common. — Fl. June, July. Perennial. These two species 

 are said to be tonic, and are made into tea by village herbalists. 



12. POTERIUM (Salad-Burnet). — Erect herbs with pinnate 

 leaves ; stipules adnate to the sheathing petiole ; flowers small, in 

 dense long-peduncled capitate cymes, often polygamous ; calyx-tube 



sanguis6rba officinalis {Great Burnet'). 



persistent, with 4 winged angles in fruit; sepals 4, imbricate, 

 deciduous ; petals absent ; stamens 20 — 30 with slender filaments 

 and pendulous exserted anthers ; carpels 2 — 3, i-ovuled, only one 

 ripening ; stigma tufted ; achenes solitary, enclosed in the hardened 

 calyx-tube. (Name from the Greek poterion, a tankard, one 

 species being used in cool drinks.) 



