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Genus Overview
Cereus is a genus of predominantly columnar, shrubby, or tree-like cacti in the family Cactaceae. The genus is native from the southern Caribbean through tropical and subtropical South America, with species occurring across countries including Argentina, Bolivia, Brazil, Colombia, Paraguay, Peru, Uruguay, Venezuela, and several Caribbean territories. Plants of the World Online currently recognizes 30 accepted species. Plants of the World Online
Cereus species are generally characterized by strongly ribbed succulent stems, prominent areoles, spines, large nocturnal flowers, and fleshy fruits. Their size and architecture can vary greatly, from branching shrubs to impressive tree-like cacti. Plants of the World Online
Browse the Cereus Collection
Explore the individual Cereus plants documented in the Green Desert Botanical Library.
Introduction
This broad ecological range contributes to the considerable variation seen throughout the genus.
Cereus is one of the classic groups of columnar cacti, forming some of the most recognizable cactus silhouettes in South American landscapes. Many species develop multiple upright branches, creating tall, candelabra-like plants as they mature.
The genus is particularly notable for its large, night-opening flowers. These are generally funnel-shaped and may be white, pinkish, cream, yellowish, or other shades depending on the species. The flowers are often followed by fleshy fruits, which can be brightly colored and are important to wildlife and, in some species, people. Wikipedia
The name Cereus is associated with the Latin word for wax or candle, an appropriate reference to the tall, candle-like stems characteristic of many members of the genus.
Native Habitat
Distinguishing Features
Cereus has a broad native distribution extending from the southern Caribbean into tropical and subtropical South America. Species occur across a remarkably varied geographic area, including dry regions of Argentina and Brazil as well as tropical landscapes farther north. Plants of the World Online
Individual species occupy different environments. Some are associated with desert and dry shrubland, while others occur in seasonally dry tropical or even wetter tropical habitats. For example, Cereus repandus is associated primarily with seasonally dry tropical environments, while Cereus hexagonus occurs in wet tropical regions of northern South America. Plants of the World Online
The collection above displays the Cereus plants currently documented in the Green Desert Botanical Library.
- Generally upright, columnar, shrubby, or tree-like cacti.
- Plants may remain relatively compact or develop into large, branching specimens.
- Stems are succulent and distinctly ribbed.
- Ribs commonly carry clearly defined areoles bearing spines.
- Spine number, length, color, and density vary considerably among species.
- Mature plants may develop a strongly branching, candelabra-like architecture.
- Flowers are generally large and funnel-shaped.
- Flowers typically open at night.
- Flower colors may include white, pink, cream, yellowish, or greenish tones.
- Fruits are fleshy and generally globose, ovoid, or elongated.
- Mature fruits may be red, yellow, or other bright colors depending on the species.
- Several species produce fruits that are edible and locally utilized.
- Species differ substantially in stem thickness, rib number, branching pattern, spination, flower characteristics, and fruit appearance. Wikipedia
Why We Love Cereus
We love Cereus for its sense of scale and presence.
A young Cereus can begin as a relatively simple column, but with time it can transform into a remarkable living sculpture—branching upward like a natural candelabra and becoming part of the landscape around it.
Its flowers provide another surprise. The rugged column that stands quietly through the day can open enormous, delicate flowers after sunset. Cereus reminds us that some of the greatest transformations in nature happen when we are no longer looking.
Life’s Whispers
“Stand tall through the long days,
and bloom when the sun has gone.
The tallest stories are sometimes written
in flowers that appear only at night.”
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Editorial Note
Cereus is an established genus, but its taxonomic history is complex. Numerous cactus names historically associated with Cereus have subsequently been transferred to other genera, while older literature may use a much broader concept of Cereus than current classifications. Plants of the World Online currently recognizes 30 accepted species and lists several historical generic names among the synonyms associated with the genus. Plants of the World Online
The Green Desert Botanical Library follows current authoritative taxonomic treatment when documenting individual Cereus plants. Historical names, synonyms, or uncertain identifications will be addressed on the individual Plant Page when relevant to a particular specimen.
References
Please refer to the References page in the main menu.
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