Difference between revisions of "Euphorbia polycarpa"
Bot. Voy. Sulphur, 50. 1844.
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| − | --><span class="statement" id="st-undefined" data-properties=""><b>Euphorbia </b>polycarpa is a highly variable species distributed throughout the Baja California peninsula, eastern Sonora, and the arid southwestern United States from southwestern Arizona to southern Nevada and central California. L. C. <b>Wheeler</b> (1941) divided the species into seven varieties, the majority of which occur in Baja California Sur. <b>He</b> reported two of these for the United States: var. hirtella and var. polycarpa. <b>Variety</b> hirtella, as the name suggests, was applied to hairy plants. <b>However</b>, it is here treated as a synonym of var. polycarpa, because variation in pubescence shows no geographic segregation and ranges along a continuum from glabrous or sparsely to densely hairy, and because glabrous and hairy branches can occur on the same individual.</span><!-- | + | --><span class="statement" id="st-undefined" data-properties=""><b>Euphorbia </b>polycarpa is a highly variable species distributed throughout the Baja California peninsula, eastern Sonora, and the arid southwestern United States from southwestern Arizona to southern <i>Nevada</i> and central California. L. C. <b>Wheeler</b> (1941) divided the species into seven varieties, the majority of which occur in Baja California Sur. <b>He</b> reported two of these for the United States: <i></i>var.<i> hirtella</i> and <i></i>var.<i> polycarpa</i>. <b>Variety</b> hirtella, as the name suggests, was applied to hairy plants. <b>However</b>, it is here treated as a synonym of <i></i>var.<i> polycarpa</i>, because variation in pubescence shows no geographic segregation and ranges along a continuum from glabrous or sparsely to densely hairy, and because glabrous and hairy branches can occur on the same individual.</span><!-- |
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|distribution=sw United States;nw Mexico. | |distribution=sw United States;nw Mexico. | ||
|discussion=<p>Varieties 5 (1 in the flora).</p><!-- | |discussion=<p>Varieties 5 (1 in the flora).</p><!-- | ||
| − | --><p>Some of the varieties occurring in Mexico are highly divergent and appear to be sufficiently distinct to merit recognition as species. However, within the flora area, Euphorbia polycarpa is relatively uniform, and the only noteworthy variation involves the size of the involucral gland appendages. In the portion of the California Floristic Province occupied by E. polycarpa (Los Angeles, Orange, western Riverside, western San Diego, and Ventura counties) the appendages are conspicuously larger than those of plants throughout the remainder of its range in the southwestern United States (0.4–1.2 versus 0.1–0.3 mm). Large-appendaged plants are also common in Baja California and correspond well with the type collection. The taxonomic significance of this variation is not clear at this time, and the small-appendaged plants may merit segregation as an infraspecific taxon. However, no formal changes are proposed, awaiting a comprehensive review of the species throughout its range.</p> | + | --><p>Some of the varieties occurring in Mexico are highly divergent and appear to be sufficiently distinct to merit recognition as species. However, within the flora area, <i>Euphorbia polycarpa</i> is relatively uniform, and the only noteworthy variation involves the size of the involucral gland appendages. In the portion of the California Floristic Province occupied by <i>E. polycarpa</i> (Los Angeles, Orange, western Riverside, western San Diego, and Ventura counties) the appendages are conspicuously larger than those of plants throughout the remainder of its range in the southwestern United States (0.4–1.2 versus 0.1–0.3 mm). Large-appendaged plants are also common in Baja California and correspond well with the type collection. The taxonomic significance of this variation is not clear at this time, and the small-appendaged plants may merit segregation as an infraspecific taxon. However, no formal changes are proposed, awaiting a comprehensive review of the species throughout its range.</p> |
|tables= | |tables= | ||
|references= | |references= | ||
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|publication year=1844 | |publication year=1844 | ||
|special status=Selected by author to be illustrated | |special status=Selected by author to be illustrated | ||
| − | |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/8f726806613d60c220dc4493de13607dd3150896/coarse_grained_fna_xml/V12/V12_620.xml |
|genus=Euphorbia | |genus=Euphorbia | ||
|section=Euphorbia sect. Anisophyllum | |section=Euphorbia sect. Anisophyllum | ||
Revision as of 14:48, 18 September 2019
Euphorbia polycarpa is a highly variable species distributed throughout the Baja California peninsula, eastern Sonora, and the arid southwestern United States from southwestern Arizona to southern Nevada and central California. L. C. Wheeler (1941) divided the species into seven varieties, the majority of which occur in Baja California Sur. He reported two of these for the United States: var. hirtella and var. polycarpa. Variety hirtella, as the name suggests, was applied to hairy plants. However, it is here treated as a synonym of var. polycarpa, because variation in pubescence shows no geographic segregation and ranges along a continuum from glabrous or sparsely to densely hairy, and because glabrous and hairy branches can occur on the same individual.
Distribution
sw United States, nw Mexico.
Discussion
Varieties 5 (1 in the flora).
Some of the varieties occurring in Mexico are highly divergent and appear to be sufficiently distinct to merit recognition as species. However, within the flora area, Euphorbia polycarpa is relatively uniform, and the only noteworthy variation involves the size of the involucral gland appendages. In the portion of the California Floristic Province occupied by E. polycarpa (Los Angeles, Orange, western Riverside, western San Diego, and Ventura counties) the appendages are conspicuously larger than those of plants throughout the remainder of its range in the southwestern United States (0.4–1.2 versus 0.1–0.3 mm). Large-appendaged plants are also common in Baja California and correspond well with the type collection. The taxonomic significance of this variation is not clear at this time, and the small-appendaged plants may merit segregation as an infraspecific taxon. However, no formal changes are proposed, awaiting a comprehensive review of the species throughout its range.
Selected References
None.