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Species
Amaranthus spinosus L.
IUCN
NCBI
EOL Text
introduced; Man., Ont.; Ala., Ark., Calif., Conn., Del., D.C., Fla., Ga., Ill., Ind., Iowa, Kans., Ky., La., Maine, Md., Mass., Minn., Miss., Mo., Nebr., N.J., N.Y., N.C., Ohio, Okla., Pa., R.I., S.C., Tenn., Tex., Vt., Va., W.Va., Wis.; Mexico; West Indies; Central America; South America; introduced nearly worldwide.
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Rights holder/Author | eFloras.org Copyright © Missouri Botanical Garden |
Source | http://www.efloras.org/florataxon.aspx?flora_id=1&taxon_id=200006989 |
Frequent
Amaranthus dubius Mart. ex Thell. may yet be found in, or be introduced into, Pakistan. It much resembles Amaranthus spinosus but lacks the axillary spines and has a different habit; from robust Amaranthus viridis it differs in its circum¬scissile capsule, which is much less strongly wrinkled than that of Amaranthus viridis.
License | http://creativecommons.org/licenses/by-nc-sa/3.0/ |
Rights holder/Author | eFloras.org Copyright © Missouri Botanical Garden |
Source | http://www.efloras.org/florataxon.aspx?flora_id=5&taxon_id=200006989 |
Distribution: Of presumed American origin, now a cosmopolitan weed in the warmer regions of the world and also occurring as a casual in some temperate regions; in Pakistan as elsewhere it occurs as a weed of cultivation, roadsides, waste places etc., ascending to at least 1210 m.
License | http://creativecommons.org/licenses/by-nc-sa/3.0/ |
Rights holder/Author | eFloras.org Copyright © Missouri Botanical Garden |
Source | http://www.efloras.org/florataxon.aspx?flora_id=5&taxon_id=200006989 |
Flowering and fruiting: June-December
Amaranthus spinosus is native to lowlands in tropical America; at present it is a pantropical weed that also occurs in some warm-temperate regions.
Amaranthus spinosus, or its ancestral taxon, probably gave rise to the allopolyploid A. dubius by hybridization with some species of the A. hybridus aggregate (see above). Section Centrusa probably occupies a basal position, at least for the clade of subg. Amaranthus sect. Amaranthus, and probably for some representatives of subg. Acnida as currently outlined. Recent results of sequencing the ITS region (including ITS-1, 5.8S rDNA, and ITS-2) of nuclear ribosomal DNA from 15 species of Amaranthus occurring in China also suggest the basal position of A. spinosus among the studied species (Song B. H. et al. 2000). These results also confirm a profound divergence between subgenera Amaranthus and Albersia; the latter is called "sect. Paucestamen" by the above authors. Data on the electrophoretic variation of seed proteins (R. H. Sammour et al. 1993) are also in accord with the segregation of these two subgenera; in the cited article, these groups are called sect. Amaranthus and sect. Blitopsis.
License | http://creativecommons.org/licenses/by-nc-sa/3.0/ |
Rights holder/Author | eFloras.org Copyright © Missouri Botanical Garden |
Source | http://www.efloras.org/florataxon.aspx?flora_id=1&taxon_id=200006989 |
Cosmopolitan warm temperate and tropical weed.
License | http://creativecommons.org/licenses/by-nc-sa/3.0/ |
Rights holder/Author | eFloras.org Copyright © Missouri Botanical Garden |
Source | http://www.efloras.org/florataxon.aspx?flora_id=110&taxon_id=200006989 |
Flowering summer-fall.
License | http://creativecommons.org/licenses/by-nc-sa/3.0/ |
Rights holder/Author | eFloras.org Copyright © Missouri Botanical Garden |
Source | http://www.efloras.org/florataxon.aspx?flora_id=1&taxon_id=200006989 |
"
Flower
In axillary or aggregated terminal panicles; greenish-white. Flowering from December-April.
Fruit
An orbicular urticle, compressed. Fruiting throughout the year.
Field tips
Stem reddish. Spines axillary, paired or clustered.
Leaf Arrangement
Alternate-spiral
Leaf Type
Simple
Leaf Shape
Elliptic-obovate to rhomboid
Leaf Apex
Acutely emarginate
Leaf Base
Acute
Leaf Margin
Entire
"
License | http://creativecommons.org/licenses/by/3.0/ |
Rights holder/Author | Keystone Foundation, India Biodiversity Portal |
Source | http://indiabiodiversity.org/species/show/32937 |
Annual.
License | http://creativecommons.org/licenses/by-nc-sa/3.0/ |
Rights holder/Author | Bibliotheca Alexandrina, BA Cultnat, Bibliotheca Alexandrina - EOL Ar |
Source | http://lifedesk.bibalex.org/ba/pages/1811 |