Sclerocactus mariposensis

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Echinomastus mariposensis
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Sclerocactus mariposensis

Imperiled (NatureServe)
CITES Appendix I (CITES)[1]
Scientific classification Edit this classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Order: Caryophyllales
Family: Cactaceae
Subfamily: Cactoideae
Genus: Sclerocactus
Species:
S. mariposensis
Binomial name
Sclerocactus mariposensis
(Hester) N.P.Taylor
Synonyms[2]
  • Echinocactus mariposensis (Hester) D.Weniger, not validly publ.
  • Echinomastus mariposensis Hester
  • Echinomastus mariposensis subsp. fischeri Halda & Sladk.
  • Neolloydia mariposensis (Hester) L.D.Benson
  • Pediocactus mariposensis (Hester) Halda

Sclerocactus mariposensis, synonyms including Echinomastus mariposensis and Neolloydia mariposensis,[2] is a rare species of cactus known by the common names Lloyd's fishhook cactus, golfball cactus, silver column cactus, and Mariposa cactus. It is native to a section of territory straddling the border between Brewster County, Texas, in the United States, and the states of Coahuila and Nuevo León in northeastern Mexico.[3][2] It has been federally listed as a threatened species in the United States since 1979.[4]

Habitat

This tiny cactus grows at about 30 sites in Texas and Coahuila, many of which are located within

scrub amongst other plants such as beaked yucca (Yucca rostrata), creosote (Larrea tridentata), and lechuguilla (Agave lechuguilla), as well as many other cacti.[3] It grows in barren, exposed, rocky habitat with substrates of limestone; it does not occur in the adjacent parts of the habitat where the rock is gypsum, and the related Sclerocactus warnockii fills its niche there.[6] This cactus may grow alongside the bunched cory cactus (Coryphantha ramillosa), another threatened cactus species.[4]

Characteristics

This is a petite cactus growing up to 10 centimeters tall by 6 wide. The body is covered with areoles bearing spines. The central spines are up to 2 centimeters long and are white, gray, or yellow in color with brownish or bluish tips. Each areole also has many radial spines which are smaller and white or gray in color, sometimes with brown tips. The flowers are white, or pink fading to white over time, often with dark midstripes, and up to 3 centimeters long. The fruit is about a centimeter in length and yellow-green in color.[4][6] Blooming occurs in February and March.[4]

Endangered status

Threats to this rare species have included mercury mining, petroleum exploration activities,

type locality of the cactus has been scoured for specimens and few are found there anymore.[4][5] Plants in Big Bend National Park occur on rugged terrain and have generally been safe from collectors.[5] In 1983 the cactus was placed on Appendix 1 of CITES in an effort to protect it from harvesting.[4]

References

  1. ^ "Appendices | CITES". cites.org. Retrieved 2022-01-14.
  2. ^ a b c "Sclerocactus mariposensis (Hester) N.P.Taylor". Plants of the World Online. Royal Botanic Gardens, Kew. Retrieved 2024-02-15.
  3. ^ a b c d E. mariposensis. Archived 2010-12-15 at the Wayback Machine Center for Plant Conservation.
  4. ^ a b c d e f g h i j k l USFWS. E. mariposensis Recovery Plan. April 1990.
  5. ^ a b c d e E. mariposensis. Texas Parks and Wildlife.
  6. ^ a b E. mariposensis. Flora of North America.

External links