Astragalus cremnophylax

Astragalus cremnophylax
Astragalus cremnophylax
var. cremnophylax
Conservation status

Critically Imperiled (NatureServe)
Scientific classification
Kingdom: Plantae
(unranked): Angiosperms
(unranked): Eudicots
(unranked): Rosids
Order: Fabales
Family: Fabaceae
Genus: Astragalus
Species: A. cremnophylax
Binomial name
Astragalus cremnophylax
Barneby

Astragalus cremnophylax is a rare species of milkvetch known by the common names sentry milkvetch and cliff milkvetch. It is endemic to Arizona, where the three varieties grow in three separate locations. The rarest variety, var. cremnophylax, is a federally listed endangered species which grows only on the rim of the Grand Canyon. The two other varieties are known from the Buckskin Mountains and Marble Canyon.

This plant is a resident of the Kaibab Limestone, where it grows in cracks in the bare limestone.[1] The habitat is a pavement of dry, exposed, white rock that takes full sun and brisk, dry winds.[1] Plants occur in rock crevices that have a few centimeters of soil, if any, and accumulate a minute amount of moisture at times.[1] The species sometimes grows alongside Petrophytum caespitosum, which occupies a similar niche.[1]

The rare var. cremnophylax was threatened with extinction when its tiny populations were trampled by tourists creeping to the edge of the Grand Canyon.[2] Fences have been placed at strategic locations there to protect the plant.

Varieties

There are three varieties of this species:[1]

  • A. cremnophylax var. cremnophylax - Grand Canyon
  • A. cremnophylax var. myriorrhaphis - Buckskin Mountains
  • A. cremnophylax var. hevronii - Marble Canyon

References

  1. ^ a b c d e "NatureServe" (web application]). NatureServe Explorer: An online encyclopedia of life. Version 7.1.. Arlington, Virginia: NatureServe. http://www.natureserve.org/explorer/servlet/NatureServe?searchName=Astragalus+cremnophylax. Retrieved March 25, 2011. 
  2. ^ "CPC National Collection Plant Profile". National Collection of Imperiled Plants-Plant Profiles. Center for Plant Conservation. September 28, 2010. http://www.centerforplantconservation.org/collection/cpc_viewprofile.asp?CPCNum=391. Retrieved March 25, 2011. 

External links



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Look at other dictionaries:

  • Astragalus cremnophylax — ID 7812 Symbol Key ASCR3 Common Name sentry milkvetch Family Fabaceae Category Dicot Division Magnoliophyta US Nativity Native to U.S. US/NA Plant Yes State Distribution AZ Growth Habit Forb/herb Duration …   USDA Plant Characteristics

  • Astragalus cremnophylax var. cremnophylax — ID 7813 Symbol Key ASCRC4 Common Name sentry milkvetch Family Fabaceae Category Dicot Division Magnoliophyta US Nativity Native to U.S. US/NA Plant Yes State Distribution AZ Growth Habit Forb/herb Duration …   USDA Plant Characteristics

  • Astragalus cremnophylax var. hevronii — ID 7814 Symbol Key ASCRH Common Name sentry milkvetch Family Fabaceae Category Dicot Division Magnoliophyta US Nativity Native to U.S. US/NA Plant Yes State Distribution AZ Growth Habit Forb/herb Duration …   USDA Plant Characteristics

  • Astragalus cremnophylax var. myriorrhaphis — ID 7815 Symbol Key ASCRM Common Name sentry milkvetch Family Fabaceae Category Dicot Division Magnoliophyta US Nativity Native to U.S. US/NA Plant Yes State Distribution AZ Growth Habit Forb/herb Duration …   USDA Plant Characteristics

  • Astragalus cremnophylax Barneby var. cremnophylax — Symbol ASCRC4 Common Name sentry milkvetch Botanical Family Fabaceae …   Scientific plant list

  • Astragalus cremnophylax Barneby — Symbol ASCR3 Common Name sentry milkvetch Botanical Family Fabaceae …   Scientific plant list

  • Astragalus cremnophylax Barneby var. hevronii Barneby — Symbol ASCRH Common Name sentry milkvetch Botanical Family Fabaceae …   Scientific plant list

  • Astragalus cremnophylax Barneby var. myriorrhaphis Barneby — Symbol ASCRM Common Name sentry milkvetch Botanical Family Fabaceae …   Scientific plant list

  • Astragalus — This article is about the plant genus. For the ankle bone, see talus bone. Astragalus Astragalus tragacantha ssp. vicentinus Scientific classification …   Wikipedia

  • Виды рода Астрагал — Приложение к статье Астрагал Список видов, входящих в род Астрагал (Astragalus) Список составлен на основе данных сайта EOL[1]. Русские названия видов даны по книге Флора СССР» и «Деревья и кустарники СССР» (см. раздел Литература) …   Википедия

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