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Useful Tropical Plants

Opuntia megarrhiza

Rose

Cactaceae

+ Synonyms

Common Name: Nopalillo

No Image.

General Information

Opuntia megarrhiza is a spiny, succulent, low-growing, much-branched shrubby cactus usually growing 20 - 30cm tall, though forming somewhat erect aerial stems up to 60cm tall every 1 - 2 years. The rootstock has long, thickened roots that can be 30 - 60cm long and 5 - 6cm thick[
411
Title
Trees and Shrubs of Mexico
Publication
Contributions from the United States National Herbarium Vol 23
Author
Standley P.C.
Publisher
Smithsonian Institution; Washington
Year
1926
ISBN
 
Description
Although dated, it contains a wealth of information on the trees and shrubs of Mexico, including many of their uses. It can be downloaded from the Internet.
,
1987
Title
The Cactus Family
Publication
 
Author
Anderson E.F.
Publisher
Timber Press; Portland, Oregon
Year
2001
ISBN
0-88192-498-9
Description
An excellent work, giving botanical descriptions of virtually all the cacti, together with their range (but not their habitats) and sometimes also a photo. it also contains a long chapter detailing the many uses of cacti and another on cultivation..
].
The plant is harvested from the wild for medicinal use.
Opuntia megarrhiza has a small extent of occurrence, its population comprises three disjunct subpopulations comprising three locations, and the quality of its habitat is expected to decline in the long term due to the intensification of human activities. In addition there is significant harvest occuring from the wild for medicinal use. The plant is classified as 'Endangered' in the IUCN Red List of Threatened Species(2013)[
338
Title
IUCN Red List of Threatened Species
Publication
 
Author
 
Website
http://www.iucnredlist.org/
Publisher
 
Year
0
ISBN
 
Description
A list of plants under threat and facing possible extinction, usually with brief details of the threats and information on habitat.
].

Known Hazards

The plant has numerous minutely barbed glochids - these are barbed spines that are usually small to minute and are very sharp and brittle. The glochids are very easily dislodged when the plant is touched and can penetrate the skin where, because of their barbs, they become stuck and are very difficult to see and remove. They can cause considerable irritation and discomfort[
200
Title
The New RHS Dictionary of Gardening. 1992.
Publication
 
Author
Huxley. A.
Publisher
MacMillan Press
Year
1992
ISBN
0-333-47494-5
Description
Excellent and very comprehensive, though it contains a number of silly mistakes. Readable yet also very detailed.
,
1999
Title
A natural history of the Sonoran Desert
Publication
 
Author
Phillips S.J. & Comus P.W.
Publisher
University of California Press; Los Angeles, California
Year
2000
ISBN
0-520-22029-3
Description
 
].
Opuntia species can contain quite high levels of oxalic acid, especially in older parts of the plant. Perfectly alright in small quantities, foods containing oxalic acid should not be eaten in large amounts since it can lock-up other nutrients in the food, especially calcium, thus causing mineral deficiencies. The oxalic acid content will be reduced if the plant is cooked. People with a tendency to rheumatism, arthritis, gout, kidney stones or hyperacidity should take especial caution if including this plant in their diet since it can aggravate their condition[
238
Title
Encyclopaedia of Herbs and their Uses.
Publication
 
Author
Bown. D.
Publisher
Dorling Kindersley, London.
Year
1995
ISBN
0-7513-020-31
Description
A very well presented and informative book on herbs from around the globe. Plenty in it for both the casual reader and the serious student. Just one main quibble is the silly way of having two separate entries for each plant.
,
1999
Title
A natural history of the Sonoran Desert
Publication
 
Author
Phillips S.J. & Comus P.W.
Publisher
University of California Press; Los Angeles, California
Year
2000
ISBN
0-520-22029-3
Description
 
].

Botanical References

1987
Title
The Cactus Family
Publication
 
Author
Anderson E.F.
Publisher
Timber Press; Portland, Oregon
Year
2001
ISBN
0-88192-498-9
Description
An excellent work, giving botanical descriptions of virtually all the cacti, together with their range (but not their habitats) and sometimes also a photo. it also contains a long chapter detailing the many uses of cacti and another on cultivation..

Range

Southern N.America - central Mexico (Tamaulipas, San Luis Potosí)

Habitat

Disturbed grassland and chaparral on the tops of mountains where the soils are relatively deep-dark clay,
with limestone outcrops[
338
Title
IUCN Red List of Threatened Species
Publication
 
Author
 
Website
http://www.iucnredlist.org/
Publisher
 
Year
0
ISBN
 
Description
A list of plants under threat and facing possible extinction, usually with brief details of the threats and information on habitat.
].

Properties

Conservation StatusEndangered
Medicinal Rating *  *  *
HabitEvergreen Shrub
Height0.25 m
PollinatorsBees, Insects
Cultivation StatusWild

Cultivation Details



The cladodes of this species die back in the winter months and regrow in the spring as an adaptation to withstand freezing and the impacts of fire[
338
Title
IUCN Red List of Threatened Species
Publication
 
Author
 
Website
http://www.iucnredlist.org/
Publisher
 
Year
0
ISBN
 
Description
A list of plants under threat and facing possible extinction, usually with brief details of the threats and information on habitat.
].

Edible Uses

The tender young stem segments of various species are often cooked as a vegetable[
411
Title
Trees and Shrubs of Mexico
Publication
Contributions from the United States National Herbarium Vol 23
Author
Standley P.C.
Publisher
Smithsonian Institution; Washington
Year
1926
ISBN
 
Description
Although dated, it contains a wealth of information on the trees and shrubs of Mexico, including many of their uses. It can be downloaded from the Internet.
]. Known as ‘nopals’ in Mexico, where they are a common ingredient in numerous dishes, they can be eaten raw or cooked, used in marmalades, soups, stews and salads. The most commonly used species are Opuntia ficus-indica or Opuntia hyptiacantha (syn Opuntia matudae), although the stems of almost all Opuntia species are edible[
411
Title
Trees and Shrubs of Mexico
Publication
Contributions from the United States National Herbarium Vol 23
Author
Standley P.C.
Publisher
Smithsonian Institution; Washington
Year
1926
ISBN
 
Description
Although dated, it contains a wealth of information on the trees and shrubs of Mexico, including many of their uses. It can be downloaded from the Internet.
,
2001
Title
Uses of Opuntia Species and the potential impact of Cactoblastis cactorum (Lepidoptera; Pyralidae) in Mexco
Publication
Florida Entomologist 84(4) pp 493-498 2001
Author
Vigueras A.L. & Portillo L.
Publisher
 
Year
2001
ISBN
 
Description
 
].

Medicinal

The rhizomes of this species are collected for medicinal use as an anti-inflammatory for broken bones[
338
Title
IUCN Red List of Threatened Species
Publication
 
Author
 
Website
http://www.iucnredlist.org/
Publisher
 
Year
0
ISBN
 
Description
A list of plants under threat and facing possible extinction, usually with brief details of the threats and information on habitat.
].
The fleshy roots are applied as poultices for the reduction of fractures and inflammation[
411
Title
Trees and Shrubs of Mexico
Publication
Contributions from the United States National Herbarium Vol 23
Author
Standley P.C.
Publisher
Smithsonian Institution; Washington
Year
1926
ISBN
 
Description
Although dated, it contains a wealth of information on the trees and shrubs of Mexico, including many of their uses. It can be downloaded from the Internet.
].

We have no further specific information on medicinal uses for this species, but the following notes are likely to apply universally to Opuntia species and other related genera[
K
Title
Plants for a Future
Author
Ken Fern
Description
Notes from observations, tasting etc at Plants For A Future and on field trips.
].

The flesh of tender young stem segments can be applied as a poultice to reduce inflammation[
411
Title
Trees and Shrubs of Mexico
Publication
Contributions from the United States National Herbarium Vol 23
Author
Standley P.C.
Publisher
Smithsonian Institution; Washington
Year
1926
ISBN
 
Description
Although dated, it contains a wealth of information on the trees and shrubs of Mexico, including many of their uses. It can be downloaded from the Internet.
].
The mucilage and soluble fibre found in the flowers and stem segments have been shown to help control blood-sugar levels associated with adult-onset diabetes[
1999
Title
A natural history of the Sonoran Desert
Publication
 
Author
Phillips S.J. & Comus P.W.
Publisher
University of California Press; Los Angeles, California
Year
2000
ISBN
0-520-22029-3
Description
 
].
There is clinical evidence that the soluble fibre in the stem segments helps reduce blood cholesterol levels[
1999
Title
A natural history of the Sonoran Desert
Publication
 
Author
Phillips S.J. & Comus P.W.
Publisher
University of California Press; Los Angeles, California
Year
2000
ISBN
0-520-22029-3
Description
 
].

Other Uses

None known

Propagation

Seed -
Cite as: Tropical Plants Database, Ken Fern. tropical.theferns.info. 2024-12-12. <tropical.theferns.info/viewtropical.php?id=Opuntia+megarrhiza>

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