A revision of Eupatorium (Compositae: Eupatorieae) from Michoacan

Wood Anatomy of Eupatorieae (Compositae)

Systematics of Isocarpha (Compositae: Eupatorieae)

Isocarpha comprises five species ranging from southern Texas and the Bahamas to northern Peru and northeastern Brazil. The genus belongs in Eupatorieae rather than Heliantheae, but structure of the head of Isocarpha with its elongate, chaffy receptacle is anomalous within Eupatorieae. An hypothesis is presented suggesting the evolutionary derivation of this type of head through formation of flo...

Cytogenetics and embryology of Eupatorium laevigatum (Compositae)

Embryological studies indicate Eupatorium laevigatum to have Antennaria type diplospory with precocious embryony. The embryo sac is of the Polygonum type and the polar nuclei fuse before anthesis (maturation of the stamens). Endosperm development is autonomous and the central cell divides only after the initial stages of embryo formation. It is estimated that about 10% of the florets in anthesi...

Revision of Pectis Section Pectidium (compositae: Tageteae)

gramineis foliis capitulis parvis." Linnaeus (1759) published alter­ nate names for Sloane's plant under both Peetis and Verbesina. The history of sect. longc Pectidium is closely intertwined with a ­ standing misapplication of the name Pectis linifolia. Only a year after Linnaeus described P. linifolia, {f . Jacquin (1760) published Pectis punctata. P. now to be tax-­ e ll Although punctata is...

THREE NEW RECORDS OF COMPOSITAE FROM IRAN

Following 3 species of Compositaeare reported as new records to Iran: Cousinia pycnoloba, Lactuca dissecta and Launaea remotiflora. The collecting localities and their figures are given.