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Bromeliaceae
Pineapple, a bromeliad
Scientific classification
Kingdom: Plantae
(unranked): Angiosperms
(unranked): Monocots
(unranked): Commelinids
Order: Poales
Family: Bromeliaceae
Subfamiles

Bromeliaceae (the bromeliads) is a family of monocot flowering plants of around 3,170 species native mainly to the tropical Americas, with a few species found in the American subtropics and one in tropical west Africa, Pitcairnia feliciana.[1] It is the one of the basal families within the Poales and is unique because it is the only family within the order that has septal nectaries and inferior ovaries.[2] These inferior ovaries characterize the Bromelioideae, a subfamily of the Bromeliaceae.[3] The family includes both epiphytes, such as Spanish moss (Tillandsia usneoides), and terrestrial species, such as the pineapple (Ananas comosus). Many bromeliads are able to store water in a "tank" formed by their tightly-overlapping leaf bases. However, the family is diverse enough to include the tank bromeliads, grey-leaved epiphytic Tillandsia species that gather water only from leaf structures called trichomes, and a large number of desert-dwelling succulents.

The largest bromeliad is Puya raimondii, which reaches 3–4 m tall in vegetative growth with a flower spike 9–10 m tall, and the smallest is probably Spanish moss.

Contents

History

Bromeliads are one of the more recent plant groups to have emerged. The greatest number of primitive species reside in the Andean highlands of South America where they originated in the tepuis of the Guyana Shield.[4] The most basal genus Brocchinia is endemic to these tepuis and is placed as the sister group to the remaining genera in the family.[5] The west African species Pitcairnia feliciana is the only bromeliad not endemic to the Americas, and is thought to have reached Africa via long-distance dispersal approximately 12 million years ago.[4]

Humans have been using bromeliads for thousands of years. The Incas, Aztecs, Maya and others used them for food, protection, fiber and ceremony, just as they are still used today. European interest began when Spanish conquistadors returned with pineapple, which became so popular as an exotic food that the image of the pineapple was adapted into European art and sculpture. In 1776, the species Guzmania lingulata was introduced to Europe, causing a sensation among gardeners unfamiliar to such a plant. In 1828, Aechmea fasciata was brought to Europe, followed by Vriesea splendens in 1840. These transplants were successful enough that they are still among the most widely grown bromeliad varieties.

In the 1800s, breeders in Belgium, France and the Netherlands started hybridizing plants for wholesale trade. Many exotic varieties were produced up until World War I, which halted breeding programs and led to the loss of some species. The plants experienced a resurgence of popularity after World War II. Since then, Dutch, Belgian and North American nurseries have largely expanded bromeliad production.

Collectors

Édouard André was a French collector/explorer whose many discoveries of bromeliads in the Cordilleras of South America would be influential on horticulturists to follow. He was felt to have served as a source of inspiration to twentieth century collectors, in particular Mulford B. Foster and Lyman Smith of the United States and Werner Rauh of Germany.[6]

Description

Bromeliad3.jpg

Bromeliads are a varied group of organisms, adapted to a number of climates. Foliage take different shapes, from needle thin to broad and flat, symmetrical to irregular, spiky and soft. The foliage, which usually grows in a rosette, is the most widely patterned and colored of any plant in the world. Leaf colors range from maroon, through shades of green, to gold. Varieties may have leaves with red, yellow, white and cream variegations. Others may be spotted with purple, red, or cream, while others have different colors on the tops and bottoms of the leaves.

The inflorescence produced by bromeliads are also regarded as considerably more diverse than any other plant family. Some flower spikes may reach 10 meters tall while others only measure 2–3 mm across. Upright stalks may be branched or simple with spikes retaining their color from two weeks up to twelve months, depending on species. In some species the flower remains unseen, growing deep in the vase of the plants.

Root systems vary according to plant type. Terrestrial bromeliad species have complex root systems that gather water and nutrients while epiphytic bromeliads only grow hard, wiry roots to attach themselves to trees and rocks.

An epiphytic bromeliad

Some bromeliads are faintly scented while others are heavily perfumed. Blooms from the species Tillandsia cyanea resemble the smell of clove spice.

One study found 175,000 bromeliads per hectare (2.5 acres) in one forest; that many bromeliads can sequester 50,000 liters (more than 13,000 gallons) of water.[7]

A wide variety of organisms take advantage of the pools of water trapped by bromeliads. A study of 209 plants from the Ecuadorian lowlands identified 11,219 animals, representing more than 300 distinct species, many found only on bromeliads; for instance, some species of ostracods, small salamanders approximately 2.5 centimeters (1 inch) in length and tree frogs. Jamaican bromeliads are home to Metopaulias depressus, a reddish-brown crab 2 cm (0.75 inch) across, which has evolved social behavior to protect its young from predation by Diceratobasis macrogaster, a species of damselfly whose larvae live in bromeliads. Some bromeliads even form homes for other species of bromeliads.[7]

Bromeliads growing on telephone lines

Adaptations

The plants within the Bromeliaceae are able to live in a vast array of environmental conditions due to their many adaptations. Trichomes, in the form of scales or hairs, allow bromeliads to capture water in cloud forests and help to reflect sunlight in desert environments. [8]. Some bromeliads have also developed an adaptation known as the tank habit, which involves the bromeliads forming a tightly bound structure with their leaves that helps to capture water and nutrients in the absence of a well-developed root system. [8]. Bromeliads also use crassulacean acid metabolism (CAM) photosynthesis to create sugars. This adaptation allows bromeliads in hot or dry climates to open their stomates at night rather than during the day, which prevents them from losing water.[9].

Distribution

Plants in the Bromeliaceae family are widely represented in their natural climates across the Americas. One species can be found in Africa. They can be found at altitudes from sea level to 4200 meters, from rainforests to deserts. Approximately half the species are epiphytes, some are lithophytes, and some are terrestrial. Accordingly, these plants can be found in the Andean highlands, from northern Chile to Colombia, in the Sechura Desert of coastal Peru, in the cloud forests of Central and South America, and in southern Florida and Texas.

Subfamilies

The family Bromeliaceae is organized into 3 subfamilies:

Genera

Gallery

Cultivation and uses

Only one bromeliad, the pineapple (Ananas comosus), is a commercially important food crop. Many other bromeliads are popular ornamental plants, grown as both garden and houseplants. There are also artificial bromeliads, which can be used as an alternative to the real ones for purposes of decorating.

References

  1. ^ Mabberley, D.J. (1997). The Plant Book. Cambridge: Cambridge University Press.  
  2. ^ Judd, Walter S. Plant systematics a phylogenetic approach. 3rd ed. Sunderland, MA: Sinauer Associates, Inc., 2007.
  3. ^ Sajo, M. G. "Floral anatomy of Bromeliaceae, with particular reference to the epigyny and septal nectaries in commelinid monocots." Plant Systematics and Evolution 247 (2004): 215-31.
  4. ^ a b Givnish, Thomas J., Kendra C. Millam, Timothy M. Evans, Jocelyn C. Hall, J. C. Pires, Paul E. Berry, and Kenneth J. Sytsma. "Ancient vicariance or recent long-distance dispersal? Inferences about phylogeny and South American-African disjunctions in Raptaceae and Bromeliaceae based on ndhf sequence data." International Journal of Plant Science 165.4 (2004): S35-54.>
  5. ^ <Barfuss, Michael H., Rosabelle Samuel, Walter Till, and Todd F. Stuessy. "Phylogenetic relationships in subfamily Tillandsioideae (Bromeliaceae) based on DNA sequence data from seven plastid regions." American Journal of Botany 92.2 (2005): 337-51.>
  6. ^ André, Édouard François. "Bromeliaceae Andreanae. Description et histoire des Bromeliacees recoltees dans La Colombie, L'Ecuador et Le Venezuela". Paris: Librairie Agricole; G. Masson, 1889
  7. ^ a b "Pineapple Dreams", The Wild Side, Olivia Judson, The New York Times, March 18, 2008
  8. ^ a b <Schulte, Katharina, Michael H. Barfuss, and Georg Zizka. "Phylogeny of Bromelioideae (Bromeliaceae) inferred from nuclear plastid DNA loci reveals the evolution of the tank habit within the subfamily." Molecular Phylogenetics and Evolution 51 (2009): 327-39.>
  9. ^ <Rex, Martina, Kerstin Patzolt, Katharina Schulte, Georg Zizka, Roberto Vasquez, Pierre L. Ibisch, and Kurt Weising. "AFLP analysis of genetic relationships in the genus Fosterella L.B. Smith (Pitcairnioideae, Bromeliaceae)." Genome 50 (2007): 90-105.>

External links

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Simple English

Bromeliaceae
Scientific classification
Kingdom: Plantae
Division: Magnoliophyta
Class: Liliopsida
Order: Poales
Family: Bromeliaceae
Juss.
Subfamiles
  • Bromelioideae
  • Pitcairnioideae
  • Tillandsioideae

Bromeliads are a family of tropical plants which includes the pineapple and several colourful houseplants. They are nearly all from Latin America and the Caribbean islands, except for Spanish moss from the southern United States, and a single kind from Africa.

Well-known kinds of bromeliad

Pineapples (Latin name: Ananas). See Pineapple.

Air plants (Latin name: Tillandsia) are very curious because they do not need any roots to stay alive. Instead they soak up moisture from the air around them through tiny, silvery scales on their leaves. They have so many of these scales that the whole plant can look grey. In the wild they grow on tree banches in rainy and misty areas. In the Caribbean there is a kind that grows on telephone wires!

Urn plants (Latin name: Aechmea) are easy to keep. They grow to about 60 cm across, but because the stiff, green-and-grey leaves have spiny edges, they need to be out of the way. Urn plants got their name because they have a hole in the middle made by the ring-shaped arrangement of their leaves. This central urn fills up with rainwater in the wild and is often home to insects and frogs. Its flowers are held high on a single stem, and protected by a globe of small, pink leaves which lasts for several months.

Vriesias (Latin names: Vriesia and Guzmania) are like urn plants, but they have no spines and their leaves are softer. They are often sold in flower shops (and sometimes in supermarkets) and are very easy to look after. Their flowers grow on a single stem, protected by flattened, colourful leaves. It is better not to fill the central space with water, as these soft-leaved plants might rot. instead their soil should be watered.

Spanish moss

Spanish moss (Latin name: Tillandsia usneoides) is a grey plant found hanging from trees in the swamps of the southern United States, especially in Louisiana but as far east as coastal Virginia. To the south it spreads as far as Chile and Argentina. It gained its current name from Spanish and French colonisers in the Gulf of Mexico. The French called it Barbe Espagnole ("Spanish beard") to insult their rivals, and the Spanish in turn called it Cabello francés ("French hair"). Today "Spanish moss" survives as a mild version of the French taunt, although some call the plant "Graybeard".

Other kinds of bromeliad

Bromelia, the plant which gives its name to the family, is the only other bromeliad with edible fruit. Its berries taste a bit like pineapple, but are less tasty, and there are not very many on each plant.

Fascicularia is the only bromeliad that can be grown in frosty areas. It is not killed by frost if it is kept dry in the winter.

Pitcairnia is the only wild bromeliad outside the Americas. One species, Pitcairnia feliciana, was discoved living in West Africa. It is probably descended from seeds carried by migrating birds.

Puya is the largest bromeliad. It can grow up to nine metres tall. It lives in the Andes mountains, and is sometimes eaten by bears for its nectar. In Chile the young leaves of some puyas are eaten in salads.

Look up Bromeliaceae in Wikispecies, a directory of species


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