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Accepted Scientific Name: Opuntia macrocentra Engelm.
Proc. Amer. Acad. Arts 3: 292 292 1856
This species tipically has stiff relatively short spines only on the upper half of the cladode. Opuntia macrocentra has longer (up to 12 cm long) and more flexible spines.
Origin and Habitat: The species occurs in West Texas (El Paso Co. E through Hudspeth, Culberson, and Reeves counties, NE Brewster Co. E of Alpine and adjacent Pecos Co.) New Mexico, Arizona and Mexico (NE Chihuahua, NE Sonora, Coahuila, and Durango). The species is abundant throughout its range. It can also be found as an ornamental plant outside of its native range.
Altitude range: 1000-1600 metres above sea level.
Habitat: Opuntia violacea (O. macrocentra) grows on various soil types in xerophyllous scrub and desert grasslands prevalently in the sandy lowlands, but also in the mountains and intermediate rocky slopes and along arroyos. A potential threat to species of the genus Opuntia is the invasion of the cactus moth Cactoblastis cactorum, which can exterminate populations completely.
- Opuntia violacea Engelm.
Opuntia macrocentra Engelm.
Proc. Amer. Acad. Arts 3: 292 292 1856
- Opuntia macrocentra Engelm.
- Opuntia violacea var. macrocentra (Engelm.) L.D.Benson
- Opuntia shreveana C.Z.Nelson
- Opuntia violacea Engelm.
- Opuntia violacea var. castetteri L.D.Benson
- Opuntia violacea var. gosseliniana (F.A.C.Weber) L.D.Benson
- Opuntia chlorotica var. gosseliniana (F.A.C.Weber) D.J.Ferguson
- Opuntia gosseliniana F.A.C.Weber
Opuntia macrocentra var. minor M.S.Anthony
Amer. Midl. Naturalist 55: 244. 1956
- Opuntia macrocentra var. minor M.S.Anthony
- Opuntia mackensenii var. minor (M.S.Anthony) A.M.Powell & Weedin
ENGLISH: Redeye prickly pear, purple prickly pear, purple-tinged prickly pear; black-spine prickly pear, black-spined prickly pear, blackspine purple prickly pear, prickly pear
SPANISH (Español): nopal, nopal de Castilla, Nopal Violaceo
TARAHUMARA: erá, eráka, iráka, wechaira, ronéraka, witóri, péchuri
Description: The Purple Prickly Pear (Opuntia violacea) is a ground-hugging to nearly upright branched shrubs 60-120 cm tall, up to 3 m wide, usually 4-10 joints high; rarely with distinct trunks. The violet-red succulent pads and long spines clearly shows that is closely related with Opuntia macrocentra if not exactly the same. The purple tinge is greatest around the areoles and on the edges, although the entire plant may be purple in winter. The key difference by which the two were separated, namely the presence of stiff, slightly shorter spines only on the upper half of the cladode, seems entirely spurious, most authors have dismissed Opuntia violacea as perhaps not worthy of even varietal status. More likely Opuntia violacea and Opuntia macrocentra are one and the same species. For more details see: Opuntia macrocentra.
Subspecies, varieties, forms and cultivars of plants belonging to the Opuntia macrocentra group
- Opuntia macrocentra Engelm.: has cladodes 15-20 cm long dark green, often purplish, with very long spines, mostly restricted to the upper margin of the cladode and only glochids on the lower areoles
fruits deep purplish red. Distribution: Arizona, Texas, and New Mexico.
- Opuntia macrocentra var. minor M.S.Anthony: has cladodes 10-15 cm long, glaucous blue-green with few areoles, fruits pinkish red. Distribution: Texas and Mexico.
- Opuntia violacea Engelm.: has stiff spines on the upper half of the cladode.
- Opuntia violacea var. gosseliniana (F.A.C.Weber) L.D.Benson: has bristlelike (flexible) spines arising from all areoles on a cladode.
Bibliography: Major references and further lectures
1) Albert Michael Powell, James F. Weedin “Cacti of the Trans-Pecos & Adjacent Areas” Texas Tech University Press, 30/Nov/2004
2) Edward F. Anderson “The Cactus Family” Timber Press, 2001
3) George Oxford Miller “Landscaping With Native Plants of Texas” Voyageur Press, 07/Apr/2006
4) Curt Backeberg “Cactus Lexicon” Sterling Publishing Company, Incorporated, 1978
5) Hiroshi Hirao “Colour encyclopaedia of cacti” Japan 1979 (Japanese language and script)
6) Willy Cullmann, Erich Götz (Dozent Dr.), Gerhard Gröner “The encyclopedia of cacti” Portland, OR: Timber Press, 1986
7) David Hunt, Nigel Taylor “The New Cactus Lexicon” DH Books, 2006 ISBN 0953813444, 9780953813445
8) James Cullen, Sabina G. Knees, H. Suzanne Cubey “The European Garden Flora Flowering Plants: A Manual for the Identification of Plants Cultivated in Europe, Both Out-of-Doors and Under Glass” Cambridge University Press, 11/Aug./2011
9) Naturalist's Big Bend:
10) Roland H. Wauer, Carl M. Fleming “An Introduction to the Trees and Shrubs, Wildflowers, Cacti, Mammals, Birds, Reptiles and Amphibians, Fish, and Insects” Texas A&M University Press, 01/gen/2002
11) Forrest Shreve, Ira Loren Wiggins “Vegetation and flora of the Sonoran Desert” Vol. 2 Stanford University Press, 1964
12) Loflin, Brian (2009). “Texas Cacti” Texas A7M University Press. pp. 99.
13) Powell, A. Michhael (2008). “Cacti of Texas A Field Guide” Texas Tech University Press. pp.144-147.
14) Benson, L.“The Cacti of the United States and Canada.” Stanford University Press, Stanford, California. 1982
15) Hernández, H.M., Gómez-Hinostrosa, C. and Goettsch, B. “Checklist of Chihuahuan Desert Cactaceae.” Harvard Papers in Botany 9(1): 51-68. 2004
16) Zimmermann, H.G., M. Pérez-SandyCuen, J. Goluvob, J. Soberón & J. Sarukhán. 2000. “Cactoblastis cactorum, una nueva plaga de muy alto riesgo para las Opuntias de México”. Biodiversitas 33(1-6).
17) Heil, K., Terry, M., Corral-Díaz, R. & Goettsch, B.K. 2013. Opuntia macrocentra. The IUCN Red List of Threatened Species 2013: e.T152846A685723. http://dx.doi.org/10.2305/IUCN.UK.2013-1.RLTS.T152846A685723.en. Downloaded on 16 March 2016.
Cultivation and Propagation: This is a a much decorative frost hardy cactus easily found in cultivation. It is a summer grower species that offers no cultivation difficulties. Its purple pads provide a striking accent for an otherwise dormant cactus garden.
Soil: Use a very a particularly draining substratum, as it is sensitive to rottenness when in presence of humidity and low temperatures and let the soil dry out between waterings, since it's natural habitat is in sandy or gravelly, well draining soils.
Repotting: Repot in the spring, when their roots become cramped. Generally, they should be repotted every other year in order to provide fresh soil. After repotting, do not water for a week or more.
Water: In summer, during the vegetative period, it must be regularly watered, but allowing the substratum to completely dry up before irrigating again (but do not overwater ); in winter, it’s to be kept dry. Preferable not to water on overcast days, humid days or cold winter days.
Hardiness: It is a quite frost resistant cactus, hardy to -7° C (- 12° C or less if very dry). However in cultivation it is better not to expose it to temperatures lower than -0° C, even if in an aerated and protected location, in order to avoid the formation of anti-aesthetic spots on the epidermis. In presence of high atmospheric humidity avoid any frost as it is particularly sensitive to root rot. USDA Zone 6-10. It can handle extremely high temperatures in summer.
Exposure: Outside full sun or afternoon shade, inside needs bright light, and some direct sun.
Use: It is suitable for small “desert” gardens, in association with other xerophytes. Where the open air cultivation is not possible due to the climate, it is to be cultivated in pot in order to shelter it in winter.
Warning: It is armed with treacherous glochid barbs. All prickly pears have tiny, hair-like glochid thorns in clusters on the pads. The barbed glochids cause extreme discomfort and must be meticulously removed with tweezers.
Propagation: Propagation: scarified seeds, stem division. Prickly pear pads root easily and grow rapidly when placed in loose, well-draining soil.
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