Rayjacksonia aurea: Difference between revisions
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'''''Rayjacksonia aurea''''' is a species of flowering plant in the [[Asteraceae|aster family]] known by the common names '''Houston tansyaster'''<ref>{{PLANTS|id=RAAU4|taxon=Rayjacksonia aurea|accessdate=19 October 2015}}</ref> and '''Houston camphor daisy'''. It is [[Endemism|endemic]] to [[Texas]] in the United States, where it is known only from the [[Greater Houston|Houston area]]. It is limited to [[Galveston County, Texas|Galveston]] and [[Harris County, Texas|Harris Counties]].<ref name=tnc>[http://www.natureserve.org/explorer/servlet/NatureServe?searchName=Machaeranthera+aurea ''Machaeranthera aurea''.] The Nature Conservancy.</ref><ref name=cpc>[http://www.centerforplantconservation.org/Collection/CPC_ViewProfile.asp?CPCNum=2763 ''Rayjacksonia aurea''.] Center for Plant Conservation.</ref> |
'''''Rayjacksonia aurea''''' is a species of flowering plant in the [[Asteraceae|aster family]] known by the common names '''Houston tansyaster'''<ref>{{PLANTS|id=RAAU4|taxon=Rayjacksonia aurea|accessdate=19 October 2015}}</ref> and '''Houston camphor daisy'''. It is [[Endemism|endemic]] to [[Texas]] in the United States, where it is known only from the [[Greater Houston|Houston area]]. It is limited to [[Galveston County, Texas|Galveston]] and [[Harris County, Texas|Harris Counties]].<ref name=tnc>[http://www.natureserve.org/explorer/servlet/NatureServe?searchName=Machaeranthera+aurea ''Machaeranthera aurea''.] The Nature Conservancy.</ref><ref name=cpc>[http://www.centerforplantconservation.org/Collection/CPC_ViewProfile.asp?CPCNum=2763 ''Rayjacksonia aurea''.] Center for Plant Conservation.</ref> |
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== Description == |
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This species is an annual herb which generally remains small in its native habitat but in cultivation may be much larger.<ref name=cpc/> It grows from a [[taproot]]. The small leaves are linear or lance-shaped and just a few millimeters wide. The [[Head (botany)|flower heads]] contain several yellow ray florets which may reach nearly a centimeter in length.<ref name=fna>[http://www.efloras.org/florataxon.aspx?flora_id=1&taxon_id=250067437 ''Rayjacksonia aurea''.] Flora of North America.</ref> The plant has a scent like [[camphor]]. Flowering occurs in October and November.<ref name=cpc/> |
This species is an annual herb which generally remains small in its native habitat but in cultivation may be much larger.<ref name=cpc/> It grows from a [[taproot]]. The small leaves are linear or lance-shaped and just a few millimeters wide. The [[Head (botany)|flower heads]] contain several yellow ray florets which may reach nearly a centimeter in length.<ref name=fna>[http://www.efloras.org/florataxon.aspx?flora_id=1&taxon_id=250067437 ''Rayjacksonia aurea''.] Flora of North America.</ref> The plant has a scent like [[camphor]]. Flowering occurs in October and November.<ref name=cpc/> |
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== Distribution and habitat == |
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This plant grows on the [[Western Gulf coastal grasslands|Texas coastal prairie]], especially on [[Mima mounds]]. The plant may occur with other rare local endemics, such as [[Chloris texensis|Texas windmill grass]]. There are fewer than 20 populations.<ref name=cpc/> |
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This plant grows on the [[Western Gulf coastal grasslands|Texas coastal prairie]], especially on [[Mima mounds]] and in open areas such as fields and pastures.<ref name=":0">{{Cite web|url=http://explorer.natureserve.org/servlet/NatureServe?searchName=Rayjacksonia+aurea|title=Comprehensive Report Species - Machaeranthera aurea|website=explorer.natureserve.org|access-date=2019-10-28}}</ref> It prefers sandy soils or loams, and typically grows in areas that are seasonally wet or are poorly drained.<ref name=":0" /> The plant may occur with other rare local endemics, such as [[Chloris texensis|Texas windmill grass]] and [[Hymenoxys texana|prairie dawn]].<ref name=":0" /> |
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== Conservation == |
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The species and its habitat are threatened by development and expansion of the Houston metropolitan area.<ref name=tnc/> |
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The species is currently classified as imperiled, and fewer than 20 populations remain.<ref name="cpc" /> The species and its habitat are threatened by development and expansion of the Houston metropolitan area, as well as from competition from woody vegetation and non-native grasses.<ref name="tnc" /><ref name=":0" /> |
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==References== |
==References== |
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Revision as of 16:23, 28 October 2019
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| Species: | R. aurea
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Machaeranthera aurea | |
Rayjacksonia aurea is a species of flowering plant in the aster family known by the common names Houston tansyaster[1] and Houston camphor daisy. It is endemic to Texas in the United States, where it is known only from the Houston area. It is limited to Galveston and Harris Counties.[2][3]
Description
This species is an annual herb which generally remains small in its native habitat but in cultivation may be much larger.[3] It grows from a taproot. The small leaves are linear or lance-shaped and just a few millimeters wide. The flower heads contain several yellow ray florets which may reach nearly a centimeter in length.[4] The plant has a scent like camphor. Flowering occurs in October and November.[3]
Distribution and habitat
This plant grows on the Texas coastal prairie, especially on Mima mounds and in open areas such as fields and pastures.[5] It prefers sandy soils or loams, and typically grows in areas that are seasonally wet or are poorly drained.[5] The plant may occur with other rare local endemics, such as Texas windmill grass and prairie dawn.[5]
Conservation
The species is currently classified as imperiled, and fewer than 20 populations remain.[3] The species and its habitat are threatened by development and expansion of the Houston metropolitan area, as well as from competition from woody vegetation and non-native grasses.[2][5]
References
- ^ NRCS. "Rayjacksonia aurea". PLANTS Database. United States Department of Agriculture (USDA). Retrieved 19 October 2015.
- ^ a b Machaeranthera aurea. The Nature Conservancy.
- ^ a b c d Rayjacksonia aurea. Center for Plant Conservation.
- ^ Rayjacksonia aurea. Flora of North America.
- ^ a b c d "Comprehensive Report Species - Machaeranthera aurea". explorer.natureserve.org. Retrieved 2019-10-28.