Difference between revisions of "Boltonia asteroides var. asteroides"
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|elevation=0–400 m | |elevation=0–400 m | ||
|distribution=Ala.;Ark.;Del.;Fla.;Ga.;La.;Md.;Miss.;N.J.;N.Y.;N.C.;Pa.;S.C.;Tex.;Va. | |distribution=Ala.;Ark.;Del.;Fla.;Ga.;La.;Md.;Miss.;N.J.;N.Y.;N.C.;Pa.;S.C.;Tex.;Va. | ||
| − | |discussion=<p>Variety asteroides is considered endangered in Maryland and Pennsylvania. Populations of <i></i>var.<i> asteroides</i> restricted to the sinkholes of Virginia and New Jersey are atypical in cypsela morphology. They lack pappus awns and wings are reduced or almost absent, characters typical of the cypselae of <i>Boltonia caroliniana</i>. Other characters (arrays with stiff, ascending branches, linear to linear-attenuate, subequal phyllaries, size of leaves and heads) are characteristic of <i></i>var.<i> asteroides</i> elsewhere. Possibly ancient hybridization between <i>B. caroliniana</i> and <i></i>var.<i> asteroides</i> may have occurred. Further detailed studies of the populations may help in resolving their taxonomic status.</p> | + | |discussion=<p>Variety asteroides is considered endangered in Maryland and Pennsylvania. Populations of <i></i></i>var.<i><i> asteroides</i> restricted to the sinkholes of Virginia and New Jersey are atypical in cypsela morphology. They lack pappus awns and wings are reduced or almost absent, characters typical of the cypselae of <i>Boltonia caroliniana</i>. Other characters (arrays with stiff, ascending branches, linear to linear-attenuate, subequal phyllaries, size of leaves and heads) are characteristic of <i></i></i>var.<i><i> asteroides</i> elsewhere. Possibly ancient hybridization between <i>B. caroliniana</i> and <i></i></i>var.<i><i> asteroides</i> may have occurred. Further detailed studies of the populations may help in resolving their taxonomic status.</p> |
|tables= | |tables= | ||
|references= | |references= | ||
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|publication year= | |publication year= | ||
|special status= | |special status= | ||
| − | |source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/ | + | |source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/f6b125a955440c0872999024f038d74684f65921/coarse_grained_fna_xml/V19-20-21/V20_820.xml |
|tribe=Asteraceae tribe Astereae | |tribe=Asteraceae tribe Astereae | ||
|genus=Boltonia | |genus=Boltonia | ||
Revision as of 18:44, 24 September 2019
Heads 10–100+; bracts linear-oblanceolate to narrowly oblanceolate, (4–)15–90 × 2–9 mm. Involucres 2.4–3.8 × 3.7–8.7 mm. Phyllaries linear to linear-attenuate or subulate, subequal, membranous margins 0.5–1 mm wide, apices acute; outer 1.7–2.8 × 0.4–0.6(–0.9) mm; inner 2.2–3.9 × 0.3–0.7(–1) mm. Cypselae obovoid, sometimes wingless; pappus awns (0–)0.4–1.2 mm, to 2/3 length of cypselae. 2n = 36.
Phenology: Flowering Jul–Nov.
Habitat: Marshes, wet prairies, roadsides, wet pine savannas, riverbanks, flood plains, swales
Elevation: 0–400 m
Distribution
Ala., Ark., Del., Fla., Ga., La., Md., Miss., N.J., N.Y., N.C., Pa., S.C., Tex., Va.
Discussion
Variety asteroides is considered endangered in Maryland and Pennsylvania. Populations of var. asteroides restricted to the sinkholes of Virginia and New Jersey are atypical in cypsela morphology. They lack pappus awns and wings are reduced or almost absent, characters typical of the cypselae of Boltonia caroliniana. Other characters (arrays with stiff, ascending branches, linear to linear-attenuate, subequal phyllaries, size of leaves and heads) are characteristic of var. asteroides elsewhere. Possibly ancient hybridization between B. caroliniana and var. asteroides may have occurred. Further detailed studies of the populations may help in resolving their taxonomic status.
Selected References
None.