Flora of Greece Volume 1. Apocynaceae: Amsonia (ed. 1)

Abstract

Description: Annual or perennial erect herbs, with latex. Leaves alternate, blades without colleters at base. Inflorescence a terminal corymbose or paniculate cyme. Sepals acuminate, without colleters at base within. Corolla blue or bluish, hypocrateriform, with spreading lobes, overlapping to left in bud; tube cylindric, slender, widened above middle; throat hairy. Corona absent. Stamens included, inserted on upper part of corolla tube; filaments short; anthers ovate or oblong, obtuse at base, without sterile basal appendages, free from style head; gynostegium absent. Distinct nectaries absent. Ovary composed of 2 free carpels, with numerous ovules, arranged in 2 series on each placenta; style filiform; style head with a thick ring of hairs at apex and collar at base. Fruit a pair of erect, cylindric-fusiform follicles. Seeds oblong-cylindric, obliquely truncate, glabrous, without coma.