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Ageratina
Family: Asteraceae
Ageratina image
Sue Carnahan
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Guy L. Nesom in Flora of North America (vol. 21)
Perennials, subshrubs, or shrubs [trees], mostly 20-220 cm. Stems usually erect, rarely scandent, sparsely to densely branched. Leaves cauline; mostly opposite (distal sometimes alternate); petiolate; blades 3(-5)-nerved from bases, usually deltate, lanceolate, ovate, rhombic, or triangular, sometimes orbiculate, margins entire, crenate, dentate, or serrate, faces glabrous or hispidulous, pilose, or puberulent, sometimes gland-dotted (A. occidentalis, A. adenophora). Heads discoid, usually in compact, (terminal and axillary) corymbiform arrays, sometimes borne singly. Involucres campanulate, 3-6 mm diam. Phyllaries persistent, 8-30 in 2(-3) series, 0- or 2-nerved, lanceolate to linear, ± equal (herbaceous). Florets 10-60; corollas white or lavender, throats obconic to campanulate (lengths 1.5-2 times diams.); styles: bases sometimes enlarged, glabrous, branches linear, seldom distally dilated. Receptacles convex (glabrous or hairy), epaleate. Cypselae prismatic or ± fusiform, usually 5-ribbed, scabrellous and/or gland-dotted; pappi usually persistent, sometimes fragile, rarely falling, of 5-40, barbellulate bristles in 1 series. x = 17.
Species within inventory project: SERNEC State Inventories
Ageratina altissima
Image of Ageratina altissima
Ageratina aromatica
Image of Ageratina aromatica
Ageratina havanensis
Image of Ageratina havanensis
Ageratina herbacea
Image of Ageratina herbacea
Ageratina jucunda
Image of Ageratina jucunda
Ageratina luciae-brauniae
Image of Ageratina luciae-brauniae
Ageratina rothrockii
Image of Ageratina rothrockii
Ageratina wrightii
Image of Ageratina wrightii
The National Science Foundation
This project made possible by National Science Foundation Award 1410069
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