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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: South Dakota || << 1 - 50 taxa >>
Achillea angustissima
Media resource of Achillea angustissima
Achillea aspleniifolia
Media resource of Achillea aspleniifolia
Achillea eradiata
Media resource of Achillea eradiata
Achillea gracilis
Media resource of Achillea gracilis
Achillea lanulosa
Media resource of Achillea lanulosa
Achillea laxiflora
Media resource of Achillea laxiflora
Achillea millefolium
Media resource of Achillea millefolium
Achillea occidentalis
Media resource of Achillea occidentalis
Achillea rosea
Media resource of Achillea rosea
Achillea tomentosa
Media resource of Achillea tomentosa
Acosta maculosa
Media resource of Acosta maculosa
Acroptilon repens
Media resource of Acroptilon repens
Actinea acaulis
Media resource of Actinea acaulis
Actinella acaulis
Media resource of Actinella acaulis
Adenocaulon bicolor
Media resource of Adenocaulon bicolor
Ageratina altissima
Media resource of Ageratina altissima
Agoseris aurantiaca
Media resource of Agoseris aurantiaca
Agoseris cuspidata
Media resource of Agoseris cuspidata
Agoseris glauca
Media resource of Agoseris glauca
Agoseris graminifolia
Media resource of Agoseris graminifolia
Agoseris rostrata
Media resource of Agoseris rostrata
Agoseris scorzonerifolia
Media resource of Agoseris scorzonerifolia
Agoseris turbinata
Media resource of Agoseris turbinata
Almutaster pauciflorus
Media resource of Almutaster pauciflorus
Ambrosia acanthicarpa
Media resource of Ambrosia acanthicarpa
Ambrosia artemisiifolia
Media resource of Ambrosia artemisiifolia
Ambrosia californica
Media resource of Ambrosia californica
Ambrosia coronopifolia
Media resource of Ambrosia coronopifolia
Ambrosia cumanensis
Media resource of Ambrosia cumanensis
Ambrosia elatior
Media resource of Ambrosia elatior
Ambrosia psilostachya
Media resource of Ambrosia psilostachya
Ambrosia rugelii
Media resource of Ambrosia rugelii
Ambrosia tomentosa
Media resource of Ambrosia tomentosa
Ambrosia trifida
Media resource of Ambrosia trifida
Amellus spinulosus
Media resource of Amellus spinulosus
Anaphalis margaritacea
Media resource of Anaphalis margaritacea
Anaphalis occidentalis
Media resource of Anaphalis occidentalis
Antennaria ambigens
Media resource of Antennaria ambigens
Antennaria ampla
Media resource of Antennaria ampla
Antennaria angustiarum
Media resource of Antennaria angustiarum
Antennaria aprica
Media resource of Antennaria aprica
Antennaria arkansana
Media resource of Antennaria arkansana
Antennaria athabascensis
Media resource of Antennaria athabascensis
Antennaria aureola
Media resource of Antennaria aureola
Antennaria bifrons
Media
not available
Antennaria bracteosa
Media resource of Antennaria bracteosa
Antennaria brainerdii
Media resource of Antennaria brainerdii
Antennaria callilepis
Media resource of Antennaria callilepis
Antennaria calophylla
Media resource of Antennaria calophylla
Antennaria campestris
Media resource of Antennaria campestris
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