Bromeliaceae
A diverse family of flowering plants native mainly to the Americas.
Bromeliaceae, commonly known as bromeliads, is a family of monocot flowering plants comprising about 80 genera and 3700 known species. Native mainly to the tropical Americas, with a few species in the American subtropics and one in tropical west Africa (Pitcairnia feliciana), bromeliads are notable for their diverse growth forms, including epiphytes like Spanish moss and terrestrial species like the pineapple. They are the sister group to the Typhaceae within the order Poales, and are the only family in that order with septal nectaries and inferior ovaries.
- Number of genera
- about 80
- Number of species
- about 3700
- Native region
- mainly tropical Americas, with one species in west Africa
- Largest species
- Puya raimondii (vegetative height 3–4 m, flower spike 9–10 m)
- Smallest species
- some Tillandsia species
- Key adaptation
- CAM photosynthesis, trichomes, tank habit
Lore & Background
Bromeliads are mostly herbaceous perennials, though a few have a tree-like habit. Many are succulent or have drought adaptations. They can be terrestrial, epiphytic, or rarely climbing; some Tillandsia species are aerophytes with reduced roots that absorb water from the air. Many bromeliads form vase-shaped rosettes that accumulate water, sometimes holding up to 10 liters and supporting small biotic communities. Their leaves are undivided with parallel veins, and the epidermis contains silica. Flowers are aggregated into inflorescences with bracts, three sepals, and three petals, and are pollinated by insects, birds (often hummingbirds), or bats; a few are wind-pollinated. Fruits are typically capsules or berries.
Reader's Guide
Bromeliads are significant for their ecological roles and adaptations. They are among the more recent plant groups, originating in the tepuis of the Guiana Shield about 100 million years ago, but did not diverge into extant subfamilies until 19 million years ago. The family is divided into eight subfamilies based on molecular evidence, with Brocchinioideae as the most basal. The West African species Pitcairnia feliciana reached Africa via long-distance dispersal about 12 million years ago. Bromeliads have evolved multiple adaptations, including CAM photosynthesis to reduce water loss, trichomes for water capture and sunlight reflection, and tank habits for storing water and nutrients. Their radiation was driven by geological events such as the Andean uplift and the uplift of Serra do Mar, which created new habitats and influenced pollinator evolution. The family includes both epiphytic and terrestrial species, with many tank bromeliads forming self-contained ecosystems. Their diversity in form and habitat—from rainforests to deserts, sea level to 4,200 meters—makes them a key group for studying plant evolution and ecology.
Did You Know?
- The largest bromeliad is Puya raimondii, reaching 3–4 m in vegetative growth with a flower spike 9–10 m tall.
- One individual tank bromeliad was found to contain four harvestmen, a spider, three species of wood lice, a centipede, a millipede, a pseudoscorpion, various beetles, earwigs, a tree seedling, chironomid fly larva, an an
- The only bromeliad not endemic to the Americas is Pitcairnia feliciana, found in tropical west Africa.
- Bromeliads are the only family in the order Poales with septal nectaries and inferior ovaries.
Frequently Asked Questions
What is Bromeliaceae?
Bromeliaceae is a large family of monocot flowering plants that includes roughly 80 genera and around 3,700 species. It encompasses everything from the familiar pineapple to the air-dwelling Spanish moss, making it one of the most visually diverse plant families in the tropics.
Where are bromeliads native to?
The vast majority of bromeliad species are found in the tropical Americas, though the family's range extends a bit into the subtropics. A single outlier species, Pitcairnia feliciana, is the only bromeliad known to grow in tropical West Africa.
What makes bromeliads ecologically special?
Bromeliads use CAM photosynthesis, which lets them conserve water by opening their stomata at night, a huge advantage in dry or nutrient-poor environments. Many species also grow as epiphytes with 'tank' rosettes that collect rainwater, creating tiny aquatic microhabitats for frogs, insects, and even small fish.
What's the biggest bromeliad ever?
Puya raimondii, a giant Andean bromeliad, can reach 3–4 meters in vegetative height and then send up a flower spike stretching another 9–10 meters. At the opposite end of the scale, certain Tillandsia species are so tiny they barely exceed a few centimeters.
How does Bromeliaceae relate to other plant families?
Within the order Poales, Bromeliaceae is the closest living relative of Typhaceae (the typhus family), making them sister groups. They are also the only family in Poales that combines septal nectaries with inferior ovaries, a trait that sets them apart from grasses and sedges.
More in Flowering Plant Families 1-21
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