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Asteraceae

Asteraceae
Asteraceae image
  • FNA
  • SW Field Guide
  • Resources
Theodore M. Barkley+, Luc Brouillet, John L. Strother in Flora of North America (vol. 19, 20 and 21)
Annuals, biennials, perennials, subshrubs, shrubs, vines, or trees. Roots usually taproots, sometimes fibrous. Stems usually erect, sometimes prostrate to ascending (underground stems sometimes woody caudices or rhizomes, sometimes fleshy). Leaves usually alternate or opposite, sometimes in basal rosettes, rarely in whorls; rarely stipulate, usually petiolate, sometimes sessile, sometimes with bases decurrent onto stems; blades usually simple (margins sometimes 1-2+ times pinnatifid or palmatifid), rarely compound. Inflorescences indeterminate heads (also called capitula); each head usually comprising a surrounding involucre of phyllaries (involucral bracts), a receptacle, and (1-)5-300+ florets; individual heads sessile or each borne on a peduncle; heads borne singly or in usually determinate, rarely indeterminate, arrays (cymiform, corymbiform, racemiform, spiciform, etc.); involucres sometimes subtended by calyculi (sing. calyculus); phyllaries borne in 1-5(-15+) series proximal to (i.e., outside of or abaxial to) the florets; receptacles usually flat to convex, sometimes conic or columnar, either paleate (bearing paleae or receptacular bracts that individually subtend some or all of the florets) or epaleate (lacking paleae); epaleate receptacles sometimes bristly or hairy or bearing subulate enations among the florets. Florets bisexual, pistillate, functionally staminate, or neuter (also called neutral); sepals highly modifed (instead of ordinary sepals, each ovary usually bears a pappus of bristles, awns, and/or scales, sometimes in combination within a single pappus); petals connate, corollas (3-)5-merous, ± actinomorphic or zygomorphic (one or both kinds in a single head, see descriptions of radiate, discoid, liguliflorous, disciform, and radiant following); stamens (4-)5, alternate with corolla lobes, filaments inserted on corollas, usually distinct, anthers introrse, usually connate and forming tubes around styles (rarely filaments connate and anthers distinct; e.g., Heliantheae, Ambrosiinae); ovaries inferior, 2-carpellate, and 1-locular with 1 basally attached, anatropous ovule; styles 1 in each bisexual, functionally staminate, or pistillate floret; each style usually ringed at base by a nectary, distally 2-branched with stigmatic papillae borne on adaxial face of each branch in 2 separate or contiguous lines or in 1 continuous band (
Desert Research Learning Center, Botany Program

The largest angiosperm family with over 22,000 described species globally, it is also one of the most distinctive in terms of its floral morphology. In North America there are 418 genera and about 2,400 species. Variable growth form, resin canals and/or lactifers often present. Leaves simple or compound, spiral or opposite, exstipulate. Inflorescence one or more heads arranged into various types of secondary inflorescences, each head subtended by phyllaries (bracts), heads of five general types: discoid, disciform, radiate, ligulate, and bilabiate. Flowers perfect, imperfect or sterile, radial or bilateral, of three types: bilabiate, disk, or ray/ligulate. Sepals highly modified, forming pappus composed of 2-many scales or bristles that are variously shaped, often hairy, barbed or plumose. Corolla of 5 connate petals, variously shaped. Stamens 5, usually with connate anthers, plunger pollen presentation, 2 connate carpels, and inferior ovaries with basal placentation. Fruit an achene (cypselae), usually arranged in a multiple fruit.

Species within checklist: NYC EcoFlora - Historical and rare collections (version Aug 2018) || << 1 - 50 taxa >>
Ageratina aromatica
Media resource of Ageratina aromatica
Anaphalis margaritacea
Media resource of Anaphalis margaritacea
Antennaria neglecta
Media resource of Antennaria neglecta
Antennaria plantaginifolia
Media resource of Antennaria plantaginifolia
Anthemis cotula
Media resource of Anthemis cotula
Artemisia biennis
Media resource of Artemisia biennis
Artemisia stelleriana
Media resource of Artemisia stelleriana
Bidens cernua
Media resource of Bidens cernua
Bidens discoidea
Media resource of Bidens discoidea
Bidens laevis
Media resource of Bidens laevis
Bidens trichosperma
Media resource of Bidens trichosperma
Centaurea nigrescens
Media resource of Centaurea nigrescens
Centaurea solstitialis
Media resource of Centaurea solstitialis
Chrysopsis mariana
Media resource of Chrysopsis mariana
Cirsium altissimum
Media resource of Cirsium altissimum
Cladanthus mixtus
Media resource of Cladanthus mixtus
Coreopsis grandiflora
Media resource of Coreopsis grandiflora
Coreopsis rosea
Media resource of Coreopsis rosea
Cyclachaena xanthiifolia
Media resource of Cyclachaena xanthiifolia
Doellingeria infirma
Media resource of Doellingeria infirma
Eupatorium pubescens
Media resource of Eupatorium pubescens
Eupatorium resinosum
Media resource of Eupatorium resinosum
Eupatorium rotundifolium
Media resource of Eupatorium rotundifolium
Eupatorium torreyanum
Media resource of Eupatorium torreyanum
Eurybia radula
Media resource of Eurybia radula
Eurybia schreberi
Media resource of Eurybia schreberi
Eurybia spectabilis
Media resource of Eurybia spectabilis
Gnaphalium uliginosum
Media resource of Gnaphalium uliginosum
Helianthus giganteus
Media resource of Helianthus giganteus
Helianthus hirsutus
Media resource of Helianthus hirsutus
Helminthotheca echioides
Media resource of Helminthotheca echioides
Hieracium gronovii
Media resource of Hieracium gronovii
Hieracium murorum
Media resource of Hieracium murorum
Hieracium sabaudum
Media resource of Hieracium sabaudum
Hieracium scabrum
Media resource of Hieracium scabrum
Inula helenium
Media resource of Inula helenium
Ionactis linariifolia
Media resource of Ionactis linariifolia
Krigia biflora
Media resource of Krigia biflora
Lactuca floridana
Media resource of Lactuca floridana
Lactuca hirsuta
Media resource of Lactuca hirsuta
Liatris scariosa
Media resource of Liatris scariosa
Nabalus albus
Media resource of Nabalus albus
Nabalus altissimus
Media resource of Nabalus altissimus
Nabalus racemosus
Media resource of Nabalus racemosus
Nabalus serpentarius
Media resource of Nabalus serpentarius
Nabalus trifoliolatus
Media resource of Nabalus trifoliolatus
Oclemena acuminata
Media resource of Oclemena acuminata
Packera obovata
Media resource of Packera obovata
Packera paupercula
Media resource of Packera paupercula
Picris hieracioides
Media resource of Picris hieracioides
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This project was made possible in part by the Institute of Museum and Library Services [MG-70-19-0057-19].

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