Artemisia Caerulescensl. var.CretaceaFiori: Indagine Morfologica, Anatomica ed Analitica

ARTEMISIA CAERULESCENS L. var CRETACEA Fiori: its morphology, anatomy and santonin content. — Artemisia caerulescens L. var. cretacea Fiori, endemic of the loamy soils of Romagna and Tuscany, has been collected near Siena and specimens have been submitted to morphological, anatomical, systematic researchs. The names of previous botanists who have collected this plant in the surroundings of Siena have been listed. The big underground apparatus of Artemisia and the variable morphological characters of the species, expecially for the inflorescence, have been put in evidence. The most outstanding anatomical characters of var. cretacea are the following: 1) in the overground stem (that means in the inflorescence axis) glandular hairs and T hairs are present, persisting also when the cork tissue is formed; the collateral vascular bundles are surrounded by a sclerenchymatic cap, outside the phloem; the parenchyma cells of the protoxylem area in the primary and secondary structure are not lignified; some...