Euphorbia nocens, formerly a variety of Euphorbia hirta (Euphorbiaceae)
Euphorbia hirta is a widespread species distributed throughout tropical and subtropical regions of the world. Four varieties of this taxon have been recognized, although many authors have chosen to treat one of these, Euphorbia hirta var. procumbens, at the rank of species as E. ophthalmica. In this...
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| Materiálatiipa: | Online |
| Giella: | spa |
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Instituto de Ecología, A.C.
2003
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| Liŋkkat: | https://abm.ojs.inecol.mx/index.php/abm/article/view/927 |
| _version_ | 1799771249237295104 |
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| author | Steinmann, Victor W. |
| author_facet | Steinmann, Victor W. |
| author_sort | Steinmann, Victor W. |
| collection | ABM |
| description | Euphorbia hirta is a widespread species distributed throughout tropical and subtropical regions of the world. Four varieties of this taxon have been recognized, although many authors have chosen to treat one of these, Euphorbia hirta var. procumbens, at the rank of species as E. ophthalmica. In this article it is argued that the varieties of Euphorbia hirta should indeed be treated as species. For this reason, Euphorbia hirta var. nocens is elevated to Euphorbia nocens. This species differs from E. hirta in possessing larger, darker-colored seeds and glomerules of cyathia that are restricted to the ends of the primary branches. It is endemic to Mexico and occurs at elevations of 1500 to 2400 m, primarily in pine-oak forest and resulting secondary vegetation. A morphological description of Euphorbia nocens is given, as well as a list of specimens examined. A key to separate this species from E. hirta, E. lineata, and E. ophthalmica is also provided. |
| format | Online |
| id | oai:oai.abm.ojs.inecol.mx:article-927 |
| institution | Acta Botanica Mexicana |
| language | spa |
| publishDate | 2003 |
| publisher | Instituto de Ecología, A.C. |
| record_format | ojs |
| spelling | oai:oai.abm.ojs.inecol.mx:article-9272022-12-24T05:01:20Z Euphorbia nocens, formerly a variety of Euphorbia hirta (Euphorbiaceae) Euphorbia nocens, anteriormente una variedad de Euphorbia hirta (Euphorbiaceae) Steinmann, Victor W. Euphorbia Euphorbia hirta Euphorbia nocens Euphorbiaceae Mexico subgenus Chamaesyce Euphorbia Euphorbia hirta Euphorbia nocens Euphorbiaceae México subgénero Chamaesyce Euphorbia hirta is a widespread species distributed throughout tropical and subtropical regions of the world. Four varieties of this taxon have been recognized, although many authors have chosen to treat one of these, Euphorbia hirta var. procumbens, at the rank of species as E. ophthalmica. In this article it is argued that the varieties of Euphorbia hirta should indeed be treated as species. For this reason, Euphorbia hirta var. nocens is elevated to Euphorbia nocens. This species differs from E. hirta in possessing larger, darker-colored seeds and glomerules of cyathia that are restricted to the ends of the primary branches. It is endemic to Mexico and occurs at elevations of 1500 to 2400 m, primarily in pine-oak forest and resulting secondary vegetation. A morphological description of Euphorbia nocens is given, as well as a list of specimens examined. A key to separate this species from E. hirta, E. lineata, and E. ophthalmica is also provided. Euphorbia hirta es una especie ampliamente distribuida a través de las regiones tropicales y subtropicales del mundo. Anteriormente fueron reconocidas cuatro variedades de este taxon, aunque muchos autores prefieren tratar una de ellas, Euphorbia hirta var. procumbens, a nivel de especie como E. ophthalmica. En este artículo se presentan evidencias que apoyan la decisión de que las variedades de E. hirta deberían de ser tratadas como especies. Por consiguiente, se eleva E. hirta var. nocens a E. nocens, que difiere de E. hirta por tener semillas más grandes y más obscuras y por formar glomérulos de ciatios solamente en posición terminal. Es endémica de México, prosperando principalmente en bosques de pino-encino y su vegetación secundaria en altidudes de 1500 a 2400 m. Se incluye una descripción morfológica y una lista de especímenes examinados. También se proporciona una clave para separar esta especie de E. hirta, E. lineata y E. ophthalmica. Instituto de Ecología, A.C. 2003-07-01 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion artículo evaluado por pares application/pdf https://abm.ojs.inecol.mx/index.php/abm/article/view/927 10.21829/abm64.2003.927 Acta Botanica Mexicana; No. 64 (2003); 37-44 Acta Botanica Mexicana; Núm. 64 (2003); 37-44 2448-7589 0187-7151 spa https://abm.ojs.inecol.mx/index.php/abm/article/view/927/1093 Derechos de autor 2016 Acta Botanica Mexicana https://creativecommons.org/licenses/by-nc/4.0 |
| spellingShingle | Steinmann, Victor W. Euphorbia nocens, formerly a variety of Euphorbia hirta (Euphorbiaceae) |
| title | Euphorbia nocens, formerly a variety of Euphorbia hirta (Euphorbiaceae) |
| title_full | Euphorbia nocens, formerly a variety of Euphorbia hirta (Euphorbiaceae) |
| title_fullStr | Euphorbia nocens, formerly a variety of Euphorbia hirta (Euphorbiaceae) |
| title_full_unstemmed | Euphorbia nocens, formerly a variety of Euphorbia hirta (Euphorbiaceae) |
| title_short | Euphorbia nocens, formerly a variety of Euphorbia hirta (Euphorbiaceae) |
| title_sort | euphorbia nocens, formerly a variety of euphorbia hirta (euphorbiaceae) |
| url | https://abm.ojs.inecol.mx/index.php/abm/article/view/927 |
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