Difference between revisions of "Euphorbia yaquiana"

Tidestrom

Proc. Biol. Soc. Wash. 48: 41. 1935.

Common names: Hairy Mojave spurge
Endemic
Basionym: Euphorbia schizoloba var. mollis Norton N. Amer. Euphorbia, 43, plate 43. 1899
Synonyms: E. incisa var. mollis (Norton) L. C. Wheeler
Treatment appears in FNA Volume 12. Treatment on page 313. Mentioned on page 296, 300.
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|name=Euphorbia schizoloba var. mollis
 
|name=Euphorbia schizoloba var. mollis
 
|authority=Norton
 
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|publication_title=N. Amer. Euphorbia,
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|publication_place=43, plate 43. 1899
 
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|elevation=1000–2200 m.
 
|elevation=1000–2200 m.
 
|distribution=Ariz.
 
|distribution=Ariz.
|discussion=<p><i>Euphorbia yaquiana</i> is endemic to Pima and Graham counties in southern Arizona and is known only from the Santa Catalina and Pinaleño mountains. Records of <i>E. yaquiana</i> from southwestern Colorado (as E. incisa <i></i>var.<i> mollis</i>) likely represent misidentifications of <i>E. brachycera</i>; therefore, those disjunct occurrences have been excluded here from the distribution of <i>E. yaquiana</i>. <i>Euphorbia yaquiana</i> has often been treated as a synonym of <i>E. schizoloba</i> <i></i>var.<i> mollis</i>, but molecular phylogenetic data show that it is more closely related to <i>E. brachycera</i> and <i>E. chamaesula</i> (J. A. Peirson et al. 2014).</p>
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|discussion=<p><i>Euphorbia yaquiana</i> is endemic to Pima and Graham counties in southern Arizona and is known only from the Santa Catalina and Pinaleño mountains. Records of <i>E. yaquiana</i> from southwestern Colorado (as E. incisa <i></i></i>var.<i><i> mollis</i>) likely represent misidentifications of <i>E. brachycera</i>; therefore, those disjunct occurrences have been excluded here from the distribution of <i>E. yaquiana</i>. <i>Euphorbia yaquiana</i> has often been treated as a synonym of <i>E. schizoloba</i> <i></i></i>var.<i><i> mollis</i>, but molecular phylogenetic data show that it is more closely related to <i>E. brachycera</i> and <i>E. chamaesula</i> (J. A. Peirson et al. 2014).</p>
 
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|publication year=1935
 
|publication year=1935
 
|special status=Endemic
 
|special status=Endemic
|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/8f726806613d60c220dc4493de13607dd3150896/coarse_grained_fna_xml/V12/V12_208.xml
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|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/f6b125a955440c0872999024f038d74684f65921/coarse_grained_fna_xml/V12/V12_208.xml
 
|genus=Euphorbia
 
|genus=Euphorbia
 
|subgenus=Euphorbia subg. Esula
 
|subgenus=Euphorbia subg. Esula

Revision as of 18:16, 24 September 2019

Herbs, perennial, with thick rootstock. Stems slender, erect or ascending, sometimes sinuous, densely branched near base, 10–50 cm, moderately to densely puberulent to lanulose. Leaves: petiole 0–1 mm; blade usually lanceolate or elliptic-lanceolate, sometimes slightly oblanceolate, 8–30 × 6–14 mm, base usually acute, occasionally short-attenuate, rarely obtuse, margins entire, apex usually acute, occasionally obtuse, acuminate, or cuspidate, surfaces sparsely to moderately puberulent to lanulose; venation pinnate, sometimes obscure, midvein prominent. Cyathial arrangement: terminal pleiochasial branches 3–5, each 1–2 times 2-branched; pleiochasial bracts broadly ovate to subcordate, usually similar in size to, occasionally wider than, distal leaves; dichasial bracts distinct, broadly ovate to almost reniform, base obtuse, margins entire, apex obtuse, acuminate to cuspidate; axillary cymose branches 0–5. Cyathia: peduncle 0.3–0.8 mm. Involucre campanulate to broadly turbinate, 2.2–3 × 2–2.5 mm, puberulent to lanulose; glands 4, semicircular, trapezoidal, or elliptic-truncate, 0.8–1.5 × 1–2.2 mm, margins strongly crenate or dentate; horns usually absent, if present then straight, 0.1–0.2 mm, generally equaling teeth on gland margin. Staminate flowers 12–20. Pistillate flowers: ovary usually puberulent, occasionally lanulose; styles 1–1.2 mm, 2-fid. Capsules oblong-ovoid, 3.5–4 × 3–4 mm, 3-lobed; cocci rounded, smooth, usually puberulent, occasionally lanulose; columella 2.5–3 mm. Seeds gray to whitish, oblong cylindric, 2–3 × 1.5–1.8 mm, irregularly shallowly pitted to almost smooth; caruncle conic, 0.6 × 0.6 mm.


Phenology: Flowering and fruiting spring–summer.
Habitat: Ponderosa pine forests, oak-pine mixed forests, dry stream banks and beds, open scrub areas, roadsides.
Elevation: 1000–2200 m.

Discussion

Euphorbia yaquiana is endemic to Pima and Graham counties in southern Arizona and is known only from the Santa Catalina and Pinaleño mountains. Records of E. yaquiana from southwestern Colorado (as E. incisa var. mollis) likely represent misidentifications of E. brachycera; therefore, those disjunct occurrences have been excluded here from the distribution of E. yaquiana. Euphorbia yaquiana has often been treated as a synonym of E. schizoloba var. mollis, but molecular phylogenetic data show that it is more closely related to E. brachycera and E. chamaesula (J. A. Peirson et al. 2014).

Selected References

None.

Lower Taxa

None.
... more about "Euphorbia yaquiana"
Ricarda Riina +, Dmitry V. Geltman +, Jess A. Peirson +  and Paul E. Berry +
Tidestrom +
Euphorbia schizoloba var. mollis +
Hairy Mojave spurge +
1000–2200 m. +
Ponderosa pine forests, oak-pine mixed forests, dry stream banks and beds, open scrub areas, roadsides. +
Flowering and fruiting spring–summer. +
Proc. Biol. Soc. Wash. +
E. incisa var. mollis +
Euphorbia yaquiana +
Euphorbia subg. Esula +
species +