Difference between revisions of "Sericocarpus rigidus"

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==Sericocarpus rigidus==
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* Scientific Name: ''Sericocarpus rigidus''
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* Family: Asteraceae
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* Common Names: white-top aster. Columbian white-top aster, Curtus's aster.
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* Synonyms/Misapplications: ''Aster curtus''
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* Codon: SERRIG
 
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'''Family:''' Asteraceae
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[[File:SERRIG1.jpg|thumb| photo by Rod Gilbert, also featured on Main Page ]]
  
'''English Name:''' White-top aster. Columbian white-top Aster, Curtus's
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=== Taxonomy ===
Aster.
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{{Taxobox
 +
| name =
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| regnum = [[Plant]]ae
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| subregnum = Viridiplantae
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| phylum = Tracheophyta
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| subphylum= Spermatophytina
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| classis = Magnoliopsida
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| subclassis = Asteranae
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| ordo = Asterales
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| familia = Asteraceae
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| genus = ''Sericocarpus'' Greene
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| species = '''''Sericocarpus rigidus''''' Lindl.
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| subspecies =
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| synonyms = *''Aster curtus'' Cronquist
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}}
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<ref>Integrated Taxonomic Information System. Retrieved from https://www.itis.gov/servlet/SingleRpt/SingleRpt?search_topic=TSN&search_value=508083#null</ref>
  
=='''Description:'''==                                            
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===Description===                                           
  
General: Nearly glabrous perennial from slender, creeping rhizomes, the stem 1-3 dm. tall, usually simple and unbranched up to the inflorescence.
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Rhizomatous perennial with a rhizomatous habit, stems usually unbranches, glabrous, and growing in colonies of many shoots.
 
   
 
   
Leaves: Lowermost leaves reduced and early-deciduous, the largest ones a little above the base. 2.5-3.5 cm. Long and 5-9 mm. wide, oblanceolate, sessile; those leaves above numerous and gradually reduced; often scabrous on the midrib beneath, and with stiff, short hairs on the margins.  
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Lowermost leaves reduced and early-deciduous, the largest ones a little above the base. 2.5-3.5 cm. Long and 5-9 mm. wide, oblanceolate, sessile; those leaves above numerous and gradually reduced; often scabrous on the midrib beneath, and with stiff, short hairs on the margins.  
  
Flowers: Heads in a close terminal cluster; involucre 7-9 mm. high, narrow, the bracts imbricate, white and papery below with a light green herbaceous tip; rays usually 2, shorter than the capillary pappus, 1-3 mm. long, white; disk flowers 9-21, pale yellowish, with purple anthers.
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Flowering heads in a tights terminal cluster; involucre 7-9 mm. high, narrow, the bracts imbricate, white and papery below with a light green herbaceous tip; rays usually 2, shorter than the capillary pappus, 1-3 mm. long, white; disk flowers 9-21, cream yellowish, with purple anthers. Distinguished by few and inconspicuous ray flowers, and colony-forming habit.
  
Fruit: Achene.
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Fruit is an achene.<ref>WTU Herbarium, Burke Museum,
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& University of Washington. Retrieved from <nowiki>https://biology.burke.washington.edu/herbarium/imagecollection/taxon.php?Taxon=Sericocarpus%20rigidus</nowiki></ref><ref name=":0">Rare Plant Field Guide: WA - DNR. Retrieved from
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<nowiki>https://www.dnr.wa.gov/NHPfieldguide</nowiki></ref>
  
=='''Geographic Range and Habitat Requirements'''==
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=== Bloom period ===
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July-August<ref name=":1">Bowcutt, F., & Hamman, Sarah. (2016). ''Vascular plants''
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of the South Sound prairies'' (First ed.). Olympia, Washington: The Evergreen''
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State College Press.</ref>
  
'''Distribution'''
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=== Distribution ===
 +
''Sericocarpus rigidus'' is considered threatened in Oregon and a sensetive species in Washington.<ref name=":1" /> Endemic to low elevation prairies from southern Vancouver Island, BC, to central Oregon.<ref>Hitchcock, C. L., Cronquist, A., Giblin, D., & Legler,
 +
B. et al. (2018). ''Flora of the Pacific Northwest: an illustrated manual''.
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Seattle: University of Washington Press.</ref> ''S. rigidus'' is found in several south Salish Sea prairies, with the majority of its populations at Fort Lewis. Individual stands may be substantial in size because of its rhizomatous habit, but large distances may span between populations because the isolation and fragmentation of prairie habitat. This species is fairly intolerant of disturbance and is more likely to be found where there is a minimum of 32 percent native bunchgrass cover, because it establishes in gaps between clumps.<ref>Clampitt, Christopher A. 1993. "Effects of Human Disturbances on Prairies and the Regional Endemic ''Aster curtus'' in Western Washington." ''Northwest Science'' 67(3):163-169.</ref> Maintaining areas of high ratios of native to exotic taxa with bunchgrass presence and low disturbance is key to the conservation of this species.<ref name=":1" />
  
West of the cascades from southern Vancouver Island, BC, to southwest Oregon, but chiefly in Washington.  
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=== Habitat ===
 
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Prairies, meadows, and open areas at low elevations. One study found that ''S. rigidus'' benefits from the activity of Mazama pocket gophers (''Thomomys mazama).'' <ref>Stinson, Derek W. 2005. "Washington State Status Report for the Mazama Pocket Gopher, Streaked Horned Lark, and Taylor's Checkerspot." Washington Department of Fish and Wildlife, Olympia. wdfw.wa.gov/publications/00390</ref>  Historically, fire helped to maintain these open grasslands by restricting Douglas-fir invasion. Associated species include snowberry (''Symphoricarpos albus''), serviceberry (''Amelanchier alnifolia''), goldenrod (''Solidago'' spp.), woolly sunflower (''Eriophyllum lanatum''), and ''Viola adunca''.<ref name=":0" />
'''Ecological Setting'''
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Prairies, Forest edges, Meadows, and open areas at low elevations.
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'''Soil Texture'''
 
'''Soil Texture'''
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Partial to full shade- shade tolerant.
 
Partial to full shade- shade tolerant.
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=== Photo Gallery ===
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<gallery>
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File:SERRIG4.jpg|photo by Rod Gilbert
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File:SERRIG2.jpg|young growth, courtesy of CNLM
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File:SERRIG3.png|young growth, courtesy of CNLM
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</gallery>
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===References===
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<references />

Latest revision as of 23:43, 20 March 2021

  • Scientific Name: Sericocarpus rigidus
  • Family: Asteraceae
  • Common Names: white-top aster. Columbian white-top aster, Curtus's aster.
  • Synonyms/Misapplications: Aster curtus
  • Codon: SERRIG

photo by Rod Gilbert, also featured on Main Page

Taxonomy

Scientific classification
Kingdom: Plantae
Subkingdom: Viridiplantae
Phylum: Tracheophyta
Subphylum: Spermatophytina
Class: Magnoliopsida
Subclass: Asteranae
Order: Asterales
Family: Asteraceae
Genus: Sericocarpus Greene
Species: Sericocarpus rigidus Lindl.
Synonyms
  • Aster curtus Cronquist

[1]

Description

Rhizomatous perennial with a rhizomatous habit, stems usually unbranches, glabrous, and growing in colonies of many shoots.

Lowermost leaves reduced and early-deciduous, the largest ones a little above the base. 2.5-3.5 cm. Long and 5-9 mm. wide, oblanceolate, sessile; those leaves above numerous and gradually reduced; often scabrous on the midrib beneath, and with stiff, short hairs on the margins.

Flowering heads in a tights terminal cluster; involucre 7-9 mm. high, narrow, the bracts imbricate, white and papery below with a light green herbaceous tip; rays usually 2, shorter than the capillary pappus, 1-3 mm. long, white; disk flowers 9-21, cream yellowish, with purple anthers. Distinguished by few and inconspicuous ray flowers, and colony-forming habit.

Fruit is an achene.[2][3]

Bloom period

July-August[4]

Distribution

Sericocarpus rigidus is considered threatened in Oregon and a sensetive species in Washington.[4] Endemic to low elevation prairies from southern Vancouver Island, BC, to central Oregon.[5] S. rigidus is found in several south Salish Sea prairies, with the majority of its populations at Fort Lewis. Individual stands may be substantial in size because of its rhizomatous habit, but large distances may span between populations because the isolation and fragmentation of prairie habitat. This species is fairly intolerant of disturbance and is more likely to be found where there is a minimum of 32 percent native bunchgrass cover, because it establishes in gaps between clumps.[6] Maintaining areas of high ratios of native to exotic taxa with bunchgrass presence and low disturbance is key to the conservation of this species.[4]

Habitat

Prairies, meadows, and open areas at low elevations. One study found that S. rigidus benefits from the activity of Mazama pocket gophers (Thomomys mazama). [7] Historically, fire helped to maintain these open grasslands by restricting Douglas-fir invasion. Associated species include snowberry (Symphoricarpos albus), serviceberry (Amelanchier alnifolia), goldenrod (Solidago spp.), woolly sunflower (Eriophyllum lanatum), and Viola adunca.[3]

Soil Texture

Most commonly found on glacial outwash soils, but also occurs on clayey soils and bedrock. When germinating, use a 35-35-25-5 potting mix (sand, compost, pertile or vermiculite, and pumice).

Moisture Regime

Dry soil- Able to tolerate drought conditions during summer months.

Shade Tolerance

Partial to full shade- shade tolerant.

Photo Gallery

References

  1. Integrated Taxonomic Information System. Retrieved from https://www.itis.gov/servlet/SingleRpt/SingleRpt?search_topic=TSN&search_value=508083#null
  2. WTU Herbarium, Burke Museum, & University of Washington. Retrieved from https://biology.burke.washington.edu/herbarium/imagecollection/taxon.php?Taxon=Sericocarpus%20rigidus
  3. 3.0 3.1 Rare Plant Field Guide: WA - DNR. Retrieved from https://www.dnr.wa.gov/NHPfieldguide
  4. 4.0 4.1 4.2 Bowcutt, F., & Hamman, Sarah. (2016). Vascular plants of the South Sound prairies (First ed.). Olympia, Washington: The Evergreen State College Press.
  5. Hitchcock, C. L., Cronquist, A., Giblin, D., & Legler, B. et al. (2018). Flora of the Pacific Northwest: an illustrated manual. Seattle: University of Washington Press.
  6. Clampitt, Christopher A. 1993. "Effects of Human Disturbances on Prairies and the Regional Endemic Aster curtus in Western Washington." Northwest Science 67(3):163-169.
  7. Stinson, Derek W. 2005. "Washington State Status Report for the Mazama Pocket Gopher, Streaked Horned Lark, and Taylor's Checkerspot." Washington Department of Fish and Wildlife, Olympia. wdfw.wa.gov/publications/00390