Difference between revisions of "Gamochaeta purpurea"
Bol. Soc. Argent. Bot. 9: 377. 1961.
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|common_names=Spoon-leaf cudweed | |common_names=Spoon-leaf cudweed | ||
| − | |basionyms={{Treatment/ID/ | + | |basionyms={{Treatment/ID/Basionym |
|name=Gnaphalium purpureum | |name=Gnaphalium purpureum | ||
|authority=Linnaeus | |authority=Linnaeus | ||
| + | |rank=species | ||
| + | |publication_title=Sp. Pl. | ||
| + | |publication_place=2: 854. 1753 | ||
}} | }} | ||
|synonyms={{Treatment/ID/Synonym | |synonyms={{Treatment/ID/Synonym | ||
|name=Gamochaeta rosacea | |name=Gamochaeta rosacea | ||
|authority=(I. M. Johnston) Anderberg | |authority=(I. M. Johnston) Anderberg | ||
| − | }}{{Treatment/ID/Synonym | + | |rank=species |
| + | }} {{Treatment/ID/Synonym | ||
|name=Gnaphalium rosaceum | |name=Gnaphalium rosaceum | ||
|authority=I. M. Johnston | |authority=I. M. Johnston | ||
| + | |rank=species | ||
}} | }} | ||
|hierarchy=Asteraceae;Asteraceae tribe Gnaphalieae;Gamochaeta;Gamochaeta purpurea | |hierarchy=Asteraceae;Asteraceae tribe Gnaphalieae;Gamochaeta;Gamochaeta purpurea | ||
| Line 32: | Line 37: | ||
|habitat=Open, usually disturbed, commonly sandy habitats, roadsides, fields, woodland clearings and edges | |habitat=Open, usually disturbed, commonly sandy habitats, roadsides, fields, woodland clearings and edges | ||
|elevation=5–300 m | |elevation=5–300 m | ||
| − | |distribution=Ont.;Ala.;Ariz.;Ark. Conn.;Del.;D.C.;Fla.;Ga.;Ill.;Ind.;Iowa;Kans.;Ky.;La.;Maine;Md.;Mass.;Mich.;Miss.;Mo.;N.J.;N.Y.;N.C.;Ohio;Okla.;Pa.;R.I.;S.C.;Tenn.;Tex.;Va.;W.Va.;Mexico;West Indies;Central America (Nicaragua);South America;Pacific Islands (Hawaii). | + | |distribution=Ont.;Ala.;Ariz.;Ark.;Conn.;Del.;D.C.;Fla.;Ga.;Ill.;Ind.;Iowa;Kans.;Ky.;La.;Maine;Md.;Mass.;Mich.;Miss.;Mo.;N.J.;N.Y.;N.C.;Ohio;Okla.;Pa.;R.I.;S.C.;Tenn.;Tex.;Va.;W.Va.;Mexico;West Indies;Central America (Nicaragua);South America;Pacific Islands (Hawaii). |
| − | |discussion=<p>Gamochaeta purpurea apparently is native to North America and adventive elsewhere.</p><!-- | + | |discussion=<p><i>Gamochaeta purpurea</i> apparently is native to North America and adventive elsewhere.</p><!-- |
| − | --><p>Basal cells of hairs on adaxial faces of leaves are expanded and glassy (versus hairs filiform to bases in most other species) and are diagnostic for Gamochaeta purpurea. From Maryland northward, plants of G. purpurea produce relatively small basal rosettes and relatively shallow fibrous roots or a filiform taproot; southward and southwestward, the basal rosettes often are larger and the fibrous roots are denser.</p><!-- | + | --><p>Basal cells of hairs on adaxial faces of leaves are expanded and glassy (versus hairs filiform to bases in most other species) and are diagnostic for <i>Gamochaeta purpurea</i>. From Maryland northward, plants of <i>G. purpurea</i> produce relatively small basal rosettes and relatively shallow fibrous roots or a filiform taproot; southward and southwestward, the basal rosettes often are larger and the fibrous roots are denser.</p><!-- |
| − | --><p>Gamochaeta purpurea apparently occurs widely through the world as a weed; it is fairly clearly native to eastern North America, where it is the least weedy of the gamochaetas. Plants of G. purpurea in southern Arizona along perennial streams at the base of the Santa Catalina Mountains were first collected in 1903 (G. L. Nesom 2004) and were, perhaps, accidentally established through visitation; the same sites are heavily infested by other, more aggressive, nonnative species. Collections of G. purpurea also have been made at higher elevations in the Santa Catalina, Rincon, and Chiricahua mountains, where the species is less likely to have been introduced by human activity. It also seems unlikely that plants in scattered Mexican localities were introduced there by human activity.</p> | + | --><p><i>Gamochaeta purpurea</i> apparently occurs widely through the world as a weed; it is fairly clearly native to eastern North America, where it is the least weedy of the gamochaetas. Plants of <i>G. purpurea</i> in southern Arizona along perennial streams at the base of the Santa Catalina Mountains were first collected in 1903 (G. L. Nesom 2004) and were, perhaps, accidentally established through visitation; the same sites are heavily infested by other, more aggressive, nonnative species. Collections of <i>G. purpurea</i> also have been made at higher elevations in the Santa Catalina, Rincon, and Chiricahua mountains, where the species is less likely to have been introduced by human activity. It also seems unlikely that plants in scattered Mexican localities were introduced there by human activity.</p> |
|tables= | |tables= | ||
|references= | |references= | ||
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-->{{#Taxon: | -->{{#Taxon: | ||
name=Gamochaeta purpurea | name=Gamochaeta purpurea | ||
| − | |||
|authority=(Linnaeus) Cabrera | |authority=(Linnaeus) Cabrera | ||
|rank=species | |rank=species | ||
| Line 54: | Line 58: | ||
|habitat=Open, usually disturbed, commonly sandy habitats, roadsides, fields, woodland clearings and edges | |habitat=Open, usually disturbed, commonly sandy habitats, roadsides, fields, woodland clearings and edges | ||
|elevation=5–300 m | |elevation=5–300 m | ||
| − | |distribution=Ont.;Ala.;Ariz.;Ark. Conn.;Del.;D.C.;Fla.;Ga.;Ill.;Ind.;Iowa;Kans.;Ky.;La.;Maine;Md.;Mass.;Mich.;Miss.;Mo.;N.J.;N.Y.;N.C.;Ohio;Okla.;Pa.;R.I.;S.C.;Tenn.;Tex.;Va.;W.Va.;Mexico;West Indies;Central America (Nicaragua);South America;Pacific Islands (Hawaii). | + | |distribution=Ont.;Ala.;Ariz.;Ark.;Conn.;Del.;D.C.;Fla.;Ga.;Ill.;Ind.;Iowa;Kans.;Ky.;La.;Maine;Md.;Mass.;Mich.;Miss.;Mo.;N.J.;N.Y.;N.C.;Ohio;Okla.;Pa.;R.I.;S.C.;Tenn.;Tex.;Va.;W.Va.;Mexico;West Indies;Central America (Nicaragua);South America;Pacific Islands (Hawaii). |
|reference=None | |reference=None | ||
|publication title=Bol. Soc. Argent. Bot. | |publication title=Bol. Soc. Argent. Bot. | ||
|publication year=1961 | |publication year=1961 | ||
|special status= | |special status= | ||
| − | |source xml=https:// | + | |source xml=https://bitbucket.org/aafc-mbb/fna-data-curation/src/2e0870ddd59836b60bcf96646a41e87ea5a5943a/coarse_grained_fna_xml/V19-20-21/V19_712.xml |
|tribe=Asteraceae tribe Gnaphalieae | |tribe=Asteraceae tribe Gnaphalieae | ||
|genus=Gamochaeta | |genus=Gamochaeta | ||
Latest revision as of 19:54, 5 November 2020
Annuals (sometimes winter annuals), 10–40(–50) cm; fibrous-rooted or taprooted. Stems erect to decumbent-ascending, densely but loosely pannose or pannose-tomentose. Leaves basal and cauline, basal and proximal cauline usually withering before flowering; blades oblanceolate to spatulate, 1–6 cm × 5–14 mm (distal similar, at least among proximal heads, margins sometimes sinuate), faces usually bicolor, abaxial closely white-pannose, adaxial usually sparsely arachnose (basal cells of hairs persistent, expanded, glassy), sometimes glabrescent. Heads initially in continuous spiciform arrays 1–4(–5) cm × (5–)10–15 mm, later interrupted (glomerules widely separated, bracteate, the proximal often on relatively long peduncles). Involucres turbinate-cylindric, 4–4.5 mm, bases sparsely arachnose. Phyllaries in 4–5 series, outer ovate-triangular, lengths 1/3–2/3 inner, apices acute-acuminate, inner triangular-lanceolate (usually striate), laminae purplish (in bud) to whitish or silvery (in fruit), apices acute (not apiculate). Florets: bisexual 3–4; all corollas usually purplish distally. Cypselae (tan) 0.6–0.7 mm. 2n = 14, 28.
Phenology: Flowering Apr–May(–Jun).
Habitat: Open, usually disturbed, commonly sandy habitats, roadsides, fields, woodland clearings and edges
Elevation: 5–300 m
Distribution
Ont., Ala., Ariz., Ark., Conn., Del., D.C., Fla., Ga., Ill., Ind., Iowa, Kans., Ky., La., Maine, Md., Mass., Mich., Miss., Mo., N.J., N.Y., N.C., Ohio, Okla., Pa., R.I., S.C., Tenn., Tex., Va., W.Va., Mexico, West Indies, Central America (Nicaragua), South America, Pacific Islands (Hawaii).
Discussion
Gamochaeta purpurea apparently is native to North America and adventive elsewhere.
Basal cells of hairs on adaxial faces of leaves are expanded and glassy (versus hairs filiform to bases in most other species) and are diagnostic for Gamochaeta purpurea. From Maryland northward, plants of G. purpurea produce relatively small basal rosettes and relatively shallow fibrous roots or a filiform taproot; southward and southwestward, the basal rosettes often are larger and the fibrous roots are denser.
Gamochaeta purpurea apparently occurs widely through the world as a weed; it is fairly clearly native to eastern North America, where it is the least weedy of the gamochaetas. Plants of G. purpurea in southern Arizona along perennial streams at the base of the Santa Catalina Mountains were first collected in 1903 (G. L. Nesom 2004) and were, perhaps, accidentally established through visitation; the same sites are heavily infested by other, more aggressive, nonnative species. Collections of G. purpurea also have been made at higher elevations in the Santa Catalina, Rincon, and Chiricahua mountains, where the species is less likely to have been introduced by human activity. It also seems unlikely that plants in scattered Mexican localities were introduced there by human activity.
Selected References
None.