The succulent members of the Euphorbia genus of plants are renowned for their graceful and architectural appearance.
Due to the fact that many of the common kinds are stem succulents, these plants are sometimes mistaken for cacti. However, they actually belong to a completely separate genus that has nearly 2000 species!
This article will discuss what makes Euphorbia so distinctive and remarkable, why it is not a cactus, how to care for Euphorbia, which species are some of the more well-known ones, and other topics.
There are a few key differences which I will break down:
Cacti are only indigenous to the New World, with the exception of the Rhipsalis baccifera. There are no cacti in Europe, Russia, Australia, nor in Africa or Asia (except for that one species of Rhipsalis). On the other hand, euphorbia are native to many regions of the world, although those from Africa and India are the most cactus-like.
Both cacti and euphorbias have prickles, however the prickles on each species are unique. All cacti have areoles, which are structures that serve as the source of the spines, which are modified leaves. The most common thorns on euphorbias are modified stems that are typically seen in pairs. Areoles do not exist in euphorbias.
Cacti and succulent Euphorbias both retain water for dry spells, but latex, a hazardous sap, is present in all Euphorbias. It is most likely a Euphorbia if you cut open a succulent and it weeps this white fluid.
Cacti and Euphorbias both produce flowers, however the blossoms are typically extremely dissimilar. Euphorbia blooms are often subtle, whereas cactus blossoms are frequently spectacularly colorful and striking. Flowers from euphorbia are frequently a light greenish-yellow tint. However, some Euphorbias, such as Euphorbia milii, have vivid flowers (Crown of Thorns).
So there you have it—in a nutshell, the similarities and differences between cacti and euphorbias. Next time you see a spiny succulent, you’ll be able to identify it as a cactus, a Euphorbia, or something else by taking a closer look.
What cactus is a member of the Euphorbia family?
The two groups of cacti (Cactaceae) and euphorbias, which are plants that store water in thicker stems or leaves to better withstand arid conditions, are sometimes confused with one another in the world of succulents (Euphorbiaceae, genus Euphorbia). In fact, a lot of people simply refer to all succulent euphorbias as “cacti,” unaware that there is a distinction.
Cacti and euphorbias both have a tendency to be stem succulents, which means that they store moisture in swelling stems. They also both have a tendency to be quite spiky and include a wide range of species with various morphologies. Although confusion is understandable because of how similar they are in many ways, dogs and cats are their closest relatives.
Although both cats and dogs are carnivorous creatures with tails, keen teeth, and furry coats, few people would mistake one for the other. You should definitely learn to distinguish between a euphorbia and a cactus if you are a gardener. You won’t ever mix them up again once you understand the distinction.
Cacti and euphorbias have similar appearances as a result of convergent evolution, which took place when the two different families of plants originated in situations of high aridity and survival strategies, giving rise to many similarities. They do, however, also disagree on several things.
Here are some guidelines for distinguishing euphorbias from cacti. You might discover that you are unknowingly growing both of them!
- Areoles exist in cacti. From these soft, fuzzy spots, flowers, branches, and spines sprout. They are found on all cacti and can be either white or yellow. Areoles are unique to plants. Therefore, if you closely examine any plant that looks like a cactus and you don’t see any areoles, as you will with euphorbias, then that plant is clearly not a cactus! Without a doubt, this is the simplest way to distinguish between the two. You’ll never again confuse a cactus with any other plant after learning this!
- If euphorbias have thorns at all, they are often single or paired modified stems. You can’t tear them off without injuring the plant because they are often thick and obviously attached to the stem. Instead of thorns, cactus contains spines, which are modified leaves. Although not usually, they frequently form a circle, and the center of the circle may also contain longer spines. However, cactus spines always emerge from those supple areoles discussed above, regardless of how they are arranged. They are very easily snapped off, and some of them are even made to snap off and pierce animal skin instead of munching on the cactus. It should be noted that there are euphorbias and cacti with no spines, therefore determining whether one has prickles or not is not always necessary.
- If you cut a euphorbia, milky sap will come out. This is a sticky latex that is virtually always white, frequently poisonous, or irritating to the skin (there is just one species with yellow sap, E. adbelkuri). The majority of cacti have clear sap that rarely irritates the skin, however a very small number of cacti, including a few Mammillaria, contain white sap.
- The blooms of cacti are typically colorful and beautiful, having petals and numerous stamens, among other conventional flower components. Look at their positioning on the plant; they always emerge from a cushy areole. Euphorbia flowers are often relatively modest, small, and yellow with no petals, though some species, like the crown of thorns (E. milii), have modified leaves called bracts that can be quite colorful around them. Never do they develop from areoles.
*Be warned that dishonest cactus growers frequently use glue guns to attach phony flowers to cacti. You’ve been duped if the flower on a cactus does not emerge from an areole and has a blob of glue underneath!
- Cacti nearly never have leaves, at least when they’re adults (all bear two cotyledons at germination). There are only a few outliers, such as a few Opuntia and Pereskia, which are actually not at all cactus-like. On the other hand, many euphorbias have leaves while having succulent stems.
- Cacti are a New World adaptation that can be found in the Caribbean, North, South, and Central America. Rhipsalis baccifera is the sole species that is indigenous to the Old World. In the Old World, primarily in Africa, Madagascar, and drier regions of Asia, succulent euphorbias first appeared. Although certain cacti, particularly those in the genus Opuntia, have escaped from cultivation and spread to other parts of the world as weeds, both are still mostly found in their original habitats in the wild.
- The family Euphorbiaceae consists of only one genus, Euphorbia. Spurges are a common name for them. There are more than 2,000 species of Euphorbia, including well-known indoor plants like crown of thorns, pencil tree, and mottled spurge (Euphorbia lactea) (E. milii). The Cactaceae is the family of cacti. About 2,000 species make up the family, which is classified into 175 genera that include Opuntia, Echinocactus, Mammillaria, and Cereus.
You’re all set! Euphorbias and cacti can easily be distinguished from one another. Euphorbias should be so different from other plants simply by not having an areole that you’ll never mistake the two again!
What two characteristics do cacti and euphorbia plants have in common?
Euphorbia and cactus differ mostly in their flowers and thorns. While euphorbia thorns emerge directly from the stem, cactus thorns emerge from areoles. Euphorbia flowers are highly modified, tiny, often yellow in color, and lack petals, but cactus flowers likewise emerge from areoles, are vividly colored, and are immediately recognizable.
Euphorbia plants and cacti are frequently confused with one another. These are two different species, though, and they differ in a number of ways.
Euphorbia, what type of a plant is it?
A genus of flowering plants in the spurge family is called Euphorbia (Euphorbiaceae). One of the biggest genera of flowering plants, Euphorbia contains approximately 2,000 different species, from diminutive annuals to enormous, long-lived perennial trees to deciduous shrubs. Some of the most recognizable euphorbias are poinsettia plants.
Plants native to Euphorbia are tough, hardy, and simple to cultivate in a variety of hardiness zones. Euphorbia plants are wonderful complements to flower beds and rock gardens because of their colorful leaves and distinctive flower structures called cyathiums. As long as they receive the proper amount of light, euphorbias thrive as both indoor and outdoor plants. The majority of them hibernate during the winter and bloom in the late spring and early summer.
How are euphorbia and cactus similar?
Euphorbia and cactus share a lot of characteristics, which is the outcome of convergent evolution. Euphorbias and cacti are two examples of stem succulents, a class of plants that store water in the stem tissues of their plants. These plants are able to endure in extremely arid environments due to this adaptability and their lack of leaves.
Cactus or Euphorbia Trigona?
Central Africa is the original home of the African milk tree (Euphorbia trigona). Because of its fervent and quick growth, it is frequently used as a hedge. Although it has names like “candelabra cactus,” “cathedral cactus,” “friendship cactus,” and “good luck cactus,” this plant is essentially a succulent. It has three unique sides that are ridged and have triangular stems. Thorns and teardrop-shaped leaves are scattered over the ridges. This plant has a growing season that is lush and green, with new growth that has a pale green tint. The Rubra or Royal Red cultivar is well known for its striking hue, which late in the season develops bright red accents.
The African milk tree has a long lifespan and grows rapidly, about 1 to 2 feet per year, to a height of 9 feet. However, this plant will only reach around half of its maximum height when planted indoors. African milk tree can only be grown outside by North American gardeners in arid climates with nighttime lows of 50 degrees Fahrenheit or above (parts of Texas, California, Florida, and Arizona). For these fortunate few, the plant offers a striking landscape element that is uncommon in American gardens.
The African milk tree’s sap can irritate the skin, eyes, and mouth and is poisonous to both people and pets. So much so that it may result in convulsions if ingested and may also result in blisters, severe eye irritation, and swallowing.
What is Euphorbia’s common name?
The spurge family includes the enormous and diversified genus of flowering plants known as Euphorbia, sometimes known as spurge (Euphorbiaceae). In common English, the term “Euphorbia” is occasionally used to refer to all members of the family Euphorbiaceae as a whole (in honor of the original genus). [2] Some euphorbias, like poinsettias around Christmas, are commonly sold commercially. Some, like the crown of thorns plant, are frequently grown as ornamentals or are collected and highly valued for the aesthetic appeal of their distinctive floral structures (Euphorbia milii). Because euphorbias from Southern Africa and Madagascar’s deserts have developed morphological traits and shapes resembling cacti from North and South America, they are frequently mistakenly referred to as cacti. [3] Because they can withstand heat and drought and have attractive or striking overall forms, some plants are employed as ornamentals in landscaping. [4] [5]
The euphorbia genus includes small annual plants and enormous, long-lived trees.
The genus is one of the largest genera of flowering plants, with over[4] or over 2,000 members[6].
[7]
Along with Rumex and Senecio, it also possesses one of the widest ranges of chromosomal counts.
[7]The type species for the genus Euphorbia is Euphorbia antiquorum.
[9] Carl Linnaeus published the first description of it in Species Plantarum in 1753.
The plants all have strange and distinctive floral structures in addition to a deadly, milky, white, latex-like sap.
[4] The genus can be characterized by the traits of the DNA sequences of its members or by the morphology of the flower heads. The flower head appears to be a single flower when seen as a whole (a pseudanthium). It has a special type of bloom, called a cyathium, in which each flower in the head is stripped down to the minimal minimum required for sexual reproduction. [4] Each flower is either male or female, with the male flowers consisting only of the stamen and the female flowers solely of the pistil. [4] These flowers lack petals, sepals, and other components that are common to flowers in other plant species. [4] Supporting structures for the flower head and other structures below have evolved to draw pollinators through nectar as well as through patterns and colors that mimic the function of petals and other flower components in other flowers. It is the only plant genus that possesses all three types of photosynthesis—CAM, C3, and C4—all at once. [4]
What distinguishes a succulent from a cactus?
What distinguishes a succulent from a cactus? The only plant that can survive in a hot south window, where the light shines through the glass intensified, is a cactus. Any plant that stores water in juicy leaves, stems, or roots to resist recurring droughts is considered a succulent. Some people accept non-fleshy desert plants while others exclude plants with flesh, such as epiphytic orchids (yuccas, puyas).
Cactus is merely a type of succulent that can hold moisture and is classified separately from other succulents (cacti is the plural form of cactus in Latin) (Cactaceae). On the other hand, not every succulent is a cactus. In addition to being close relatives of the pointsetta, geranium, lily, grape, amaryllis, crassula, daisy, and milkweed, succulents are members of approximately 40 botanical families that are distributed throughout the world.
The name “cactus” derives from the Greek word “kaktos,” which means “spiny plant.” The ancient Greeks used this word to describe a species that was actually an artichoke variety rather than a cactus. 2000 years later, Linnaeus, who classified plants, gave a family of plants with distinctive characteristics like thick stems that served as water reservoirs, prickly or hairy coverings, and few, if any, leaves the name Cactaceae.
Cacti are simple to spot. They rarely have leaves because they have to work so hard to stay alive. They have stems that have been altered into cylinders, pads, or joints that store water during dry spells. Skin thickness lowers evaporation. For defense against browsing animals, the majority of species have bristles or spines, but some lack them, and others have long hair or a woolly covering. Large and vibrant flowers are the norm. Fruit may be both edible and colorful.
Every cactus has leaves when it is still a seedling. Additionally, some plants briefly produce tiny leaves on their new growth each spring. The majority of cactus progressively lost their leaves as shifting climatic patterns transformed native environments into deserts, evaporating too much limited water into the dry air. They switched to storing the water that was available in their stems. To adapt the size of their evaporation surfaces to changing conditions, many may modify their shape. When moisture is abundant, ribs that resemble an accordion can extend; when there is a drought, they can contract.
The majority of succulents, such as aloes, hawthorias, crassulas, and echeveria, originated in environments with less harsh conditions than cactus, such as those with rainy seasons followed by protracted dry seasons. They all have leaves. Their leaves gradually grew fattened by water-storing tissues and covered in a waxy or horny substance that lessens evaporation from the surface to help them get through the dry spells.
From Canada, through Central America, the West Indies, and south to the chilly regions of Chile and Patagonia, the cactus (Cactaceae) family can be found (southern end of South America). The largest collection may be in Mexico, but there are also a large number in the western deserts of the United States and at higher elevations in the Cordilleras of Peru, Bolivia, and Argentina.
The majority of succulents are native to milder, semi-desert regions of the planet (Mexico, South Africa). Some (such as sedums and sempervivums) are native to cooler regions where they thrive on sunny, rocky ledges and slopes. Although there are many succulents around the world, not all succulents are desert plants. They can be found on mountains, in jungles, and next to bodies of water. Succulents can be found in semi-arid parts of North and South America, Asia, and Africa, but many also live in rain forests. Succulents can be found in the mountains where they can survive inclement weather, strong winds, and poor soil. Aeonium is a succulent native to Africa, the Canary and Madeira Islands; Agave is a succulent native to the Americas; Aloe is a succulent native to Africa, the Mediterranean, and Atlantic islands; Cotyledon is a succulent native to semi-arid regions of Africa; Crassula is a succulent native to mostly Africa; Dudleya is a succulent native to coastal California and Mexico; Faucaria is a succulent native to South Africa; Sempervivum: North Africa, Asia Minor, and Central and Southern Europe.