Difference between revisions of "Echinocereus davisii"

Houghton

Cact. Succ. J. (Los Angeles) 2: 466, fig. 1931.

Common names: Davis’s hedgehog cactus
IllustratedEndemic
Synonyms: Echinocereus viridiflorus var. davisii (Houghton) W. T. Marshall ex Backeberg
Treatment appears in FNA Volume 4. Mentioned on page 170.
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|common_names=Davis’s hedgehog cactus
 
|common_names=Davis’s hedgehog cactus
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|special_status={{Treatment/ID/Special_status
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|code=F
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|label=Illustrated
 +
}}{{Treatment/ID/Special_status
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|code=E
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|label=Endemic
 +
}}
 
|basionyms=
 
|basionyms=
 
|synonyms={{Treatment/ID/Synonym
 
|synonyms={{Treatment/ID/Synonym
 
|name=Echinocereus viridiflorus var. davisii
 
|name=Echinocereus viridiflorus var. davisii
 
|authority=(Houghton) W. T. Marshall ex Backeberg
 
|authority=(Houghton) W. T. Marshall ex Backeberg
 +
|rank=variety
 
}}
 
}}
 
|hierarchy=Cactaceae;Cactaceae subfam. Cactoideae;Echinocereus;Echinocereus davisii
 
|hierarchy=Cactaceae;Cactaceae subfam. Cactoideae;Echinocereus;Echinocereus davisii
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}}<!--
  
--><span class="statement" id="st-d0_s0" data-properties="plant size;plant architecture"><b>Plants </b>tiny, usually unbranched in the wild, nearly covered by soil (often having only 2–5 areoles exposed).</span> <span class="statement" id="st-d0_s1" data-properties="stem orientation;stem shape;stem atypical length;stem length;stem atypical width;stem width"><b>Stems </b>erect, spheric, (1–) 2–3 × 1–2 (–2.5) cm;</span> <span class="statement" id="st-d0_s2" data-properties="rib count;crest prominence;crest shape">ribs 6–9, crests poorly defined, undulate;</span> <span class="statement" id="st-d0_s3" data-properties="areole atypical some measurement;areole some measurement;areole arrangement">areoles of largest plants 6–7 (–10) mm apart.</span> <span class="statement" id="st-d0_s4" data-properties="spine atypical count;spine count;spine coloration;spine coloration;spine coloration;spine coloration;spine coloration;spine coloration;spine coloration;spine coloration;spine coloration;plant life cycle;plant course;direction arrangement or orientation"><b>Spines </b>8–14 (–15) per areole, in relatively old plants curving irregularly in random directions, gray or white, some or all tipped black, dark reddish-brown, or dull reddish purple;</span> <span class="statement" id="st-d0_s5" data-properties="spine arrangement;spine count;spine arrangement;spine atypical some measurement;spine atypical some measurement;spine some measurement">radial spines 8–14 per areole, ± pectinately arranged, (5–) 10–15 (–19) mm;</span> <span class="statement" id="st-d0_s6" data-properties="central spine atypical count;central spine count;central spine shape;central spine some measurement;largest spine arrangement">central spines 0 (–1) per areole, terete, 10–12 mm, closely resembling largest radial spines.</span> <span class="statement" id="st-d0_s7" data-properties="flower length;flower atypical width;flower width"><b>Flowers </b>1.5–2 × 1.5–2 (–2.7) cm;</span> <span class="statement" id="st-d0_s8" data-properties="flower tube length;flower tube width">flower tube 5–8 × 5–10 mm;</span> <span class="statement" id="st-d0_s9" data-properties="flower tube hair height or length or size;flower tube hair prominence">flower tube hairs very short, inconspicuous;</span> <span class="statement" id="st-d0_s10" data-properties="inner tepal coloration;inner tepal length;inner tepal width;midstripe coloration;tip width;tip fragility">inner tepals bright yellow-green, often with maroon midstripes, 9–18 × 2.7–3.8 mm, tips relatively thin and delicate;</span> <span class="statement" id="st-d0_s11" data-properties="anther coloration">anthers yellow;</span> <span class="statement" id="st-d0_s12" data-properties="nectar chamber some measurement">nectar chamber 1 mm.</span> <span class="statement" id="st-d0_s13" data-properties=""><b>Fruits </b>purplish brown or remaining green when ripe, 5.5–9 (–11) mm, pulp white.</span> <span class="statement" id="st-d0_s14" data-properties="fruit coloration;fruit coloration;fruit coloration;2n chromosome count">2n = 22.</span><!--
+
--><span class="statement" id="st-undefined" data-properties=""><b>Plants </b>tiny, usually unbranched in the wild, nearly covered by soil (often having only 2–5 areoles exposed). <b>Stems</b> erect, spheric, (1–)2–3 × 1–2(–2.5) cm; ribs 6–9, crests poorly defined, undulate; areoles of largest plants 6–7(–10) mm apart. <b>Spines</b> 8–14(–15) per areole, in relatively old plants curving irregularly in random directions, gray or white, some or all tipped black, dark reddish brown, or dull reddish purple; radial spines 8–14 per areole, ± pectinately arranged, (5–)10–15(–19) mm; central spines 0(–1) per areole, terete, 10–12 mm, closely resembling largest radial spines. <b>Flowers</b> 1.5–2 × 1.5–2(–2.7) cm; flower tube 5–8 × 5–10 mm; flower tube hairs very short, inconspicuous; inner tepals bright yellow-green, often with maroon midstripes, 9–18 × 2.7–3.8 mm, tips relatively thin and delicate; anthers yellow; nectar chamber 1 mm. <b>Fruits</b> purplish brown or remaining green when ripe, 5.5–9(–11) mm, pulp white. <b>2n</b> = 22.</span><!--
  
 
-->{{Treatment/Body
 
-->{{Treatment/Body
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|phenology=Flowering Feb–Mar; fruiting 1 1/2-2 months after flowering.
 
|habitat=Semidesert grasslands, novaculite outcrops
 
|habitat=Semidesert grasslands, novaculite outcrops
 
|elevation=1200-1300 m
 
|elevation=1200-1300 m
 
|distribution=Tex.
 
|distribution=Tex.
|discussion=<p>The relatively heavy, brown-and-white, often slightly contorted radial spines of Echinocereus davisii help to distinguish these tiny plants from seedlings of their larger congeners; remains of flowers and fruits, such as scattered flower tube spine-clusters, provide proof of sexual maturity. Echinocereus davisii is easily distinguished from E. viridiflorus; it is parapatric with E. viridiflorus without evidence of introgression. Echinocereus davisii is less compatible with E. viridiflorus than any varieties of E. viridiflorus are with one another (E. E. Leuck 1980).</p><!--
+
|discussion=<p>The relatively heavy, brown-and-white, often slightly contorted radial spines of <i>Echinocereus davisii</i> help to distinguish these tiny plants from seedlings of their larger congeners; remains of flowers and fruits, such as scattered flower tube spine-clusters, provide proof of sexual maturity. <i>Echinocereus davisii</i> is easily distinguished from <i>E. viridiflorus</i>; it is parapatric with <i>E. viridiflorus</i> without evidence of introgression. <i>Echinocereus davisii</i> is less compatible with <i>E. viridiflorus</i> than any varieties of <i>E. viridiflorus</i> are with one another (E. E. Leuck 1980).</p><!--
--><p>Echinocereus davisii is in the Center for Plant Conservation’s National Collection of Endangered Plants.</p>
+
--><p><i>Echinocereus davisii</i> is in the Center for Plant Conservation’s National Collection of Endangered Plants.</p>
 
|tables=
 
|tables=
 
|references=
 
|references=
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-->{{#Taxon:
 
-->{{#Taxon:
 
name=Echinocereus davisii
 
name=Echinocereus davisii
|author=
 
 
|authority=Houghton
 
|authority=Houghton
 
|rank=species
 
|rank=species
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|basionyms=
 
|basionyms=
 
|family=Cactaceae
 
|family=Cactaceae
 +
|phenology=Flowering Feb–Mar; fruiting 1 1/2-2 months after flowering.
 
|habitat=Semidesert grasslands, novaculite outcrops
 
|habitat=Semidesert grasslands, novaculite outcrops
 
|elevation=1200-1300 m
 
|elevation=1200-1300 m
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|publication title=Cact. Succ. J. (Los Angeles)
 
|publication title=Cact. Succ. J. (Los Angeles)
 
|publication year=1931
 
|publication year=1931
|special status=
+
|special status=Illustrated;Endemic
|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-fine-grained-xml.git/src/287ef3db526bd807d435a3c7423ef2df1e951227/V4/V4_325.xml
+
|source xml=https://bitbucket.org/aafc-mbb/fna-data-curation/src/2e0870ddd59836b60bcf96646a41e87ea5a5943a/coarse_grained_fna_xml/V4/V4_325.xml
 
|subfamily=Cactaceae subfam. Cactoideae
 
|subfamily=Cactaceae subfam. Cactoideae
 
|genus=Echinocereus
 
|genus=Echinocereus
 
|species=Echinocereus davisii
 
|species=Echinocereus davisii
|2n chromosome count=22
 
|anther coloration=yellow
 
|areole arrangement=apart
 
|areole atypical some measurement=7mm;10mm
 
|areole some measurement=6mm;7mm
 
|central spine atypical count=0;1
 
|central spine count=0
 
|central spine shape=terete
 
|central spine some measurement=10mm;12mm
 
|crest prominence=defined
 
|crest shape=undulate
 
|direction arrangement or orientation=random
 
|flower atypical width=2cm;2.7cm
 
|flower length=1.5cm;2cm
 
|flower tube hair height or length or size=short
 
|flower tube hair prominence=inconspicuous
 
|flower tube length=5mm;8mm
 
|flower tube width=5mm;10mm
 
|flower width=1.5cm;2cm
 
|fruit coloration=white;remaining green when ripe , 5.5-9(-11) mm , pulp;purplish brown
 
|inner tepal coloration=bright yellow-green
 
|inner tepal length=9mm;18mm
 
|inner tepal width=2.7mm;3.8mm
 
|largest spine arrangement=radial
 
|midstripe coloration=maroon
 
|nectar chamber some measurement=1
 
|plant architecture=unbranched
 
|plant course=curving
 
|plant life cycle=old
 
|plant size=tiny
 
|rib count=6;9
 
|spine arrangement=arranged;radial
 
|spine atypical count=14;15
 
|spine atypical some measurement=15mm;19mm
 
|spine coloration=reddish purple;dull;dark reddish-brown;reddish purple;dull;dark reddish-brown;tipped black;white;gray
 
|spine count=8;14
 
|spine some measurement=10mm;15mm
 
|stem atypical length=1cm;2cm
 
|stem atypical width=2cm;2.5cm
 
|stem length=2cm;3cm
 
|stem orientation=erect
 
|stem shape=spheric
 
|stem width=1cm;2cm
 
|tip fragility=delicate
 
|tip width=thin
 
 
}}<!--
 
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-->[[Category:Treatment]][[Category:Echinocereus]]
 
-->[[Category:Treatment]][[Category:Echinocereus]]

Latest revision as of 22:57, 5 November 2020

Plants tiny, usually unbranched in the wild, nearly covered by soil (often having only 2–5 areoles exposed). Stems erect, spheric, (1–)2–3 × 1–2(–2.5) cm; ribs 6–9, crests poorly defined, undulate; areoles of largest plants 6–7(–10) mm apart. Spines 8–14(–15) per areole, in relatively old plants curving irregularly in random directions, gray or white, some or all tipped black, dark reddish brown, or dull reddish purple; radial spines 8–14 per areole, ± pectinately arranged, (5–)10–15(–19) mm; central spines 0(–1) per areole, terete, 10–12 mm, closely resembling largest radial spines. Flowers 1.5–2 × 1.5–2(–2.7) cm; flower tube 5–8 × 5–10 mm; flower tube hairs very short, inconspicuous; inner tepals bright yellow-green, often with maroon midstripes, 9–18 × 2.7–3.8 mm, tips relatively thin and delicate; anthers yellow; nectar chamber 1 mm. Fruits purplish brown or remaining green when ripe, 5.5–9(–11) mm, pulp white. 2n = 22.


Phenology: Flowering Feb–Mar; fruiting 1 1/2-2 months after flowering.
Habitat: Semidesert grasslands, novaculite outcrops
Elevation: 1200-1300 m

Discussion

The relatively heavy, brown-and-white, often slightly contorted radial spines of Echinocereus davisii help to distinguish these tiny plants from seedlings of their larger congeners; remains of flowers and fruits, such as scattered flower tube spine-clusters, provide proof of sexual maturity. Echinocereus davisii is easily distinguished from E. viridiflorus; it is parapatric with E. viridiflorus without evidence of introgression. Echinocereus davisii is less compatible with E. viridiflorus than any varieties of E. viridiflorus are with one another (E. E. Leuck 1980).

Echinocereus davisii is in the Center for Plant Conservation’s National Collection of Endangered Plants.

Selected References

None.

Lower Taxa

None.
... more about "Echinocereus davisii"
Allan D. Zimmerman +  and Bruce D. Parfitt +
Houghton +
Davis’s hedgehog cactus +
1200-1300 m +
Semidesert grasslands, novaculite outcrops +
Flowering Feb–Mar +  and fruiting 1 1/2-2 months after flowering. +
Cact. Succ. J. (Los Angeles) +
Illustrated +  and Endemic +
Echinocereus viridiflorus var. davisii +
Echinocereus davisii +
Echinocereus +
species +