AQUATIC PLANTS

The magical pools in the Aquatic Plants Gallery simulate the flow of a river winding through the tropics. The gallery features carnivorous pitcher plants, warm-growing orchids, and brightly painted Heliconia and Hibiscus. Giant taro leaves line the pond and the flowers of hundreds of bromeliads emerge from their water-filled buckets. A sculpture of a Victoria amazonica water lily hangs suspended in the air. The Victoria amazonica, lotus plants, and colorful water lilies grow in the ponds during the summers when water conditions are just right.

You can visit all the galleries: Potted Plants | Lowland Tropics | Highland Tropics | Aquatic Plants

Click images to enlarge.

Aeschynanthus radicans
Common Name: Lipstick Plant
Family Name:  Gesneriaceae
Native to: Malay Peninsula to Java

Hanging throughout the Conservatory is Aeschynanthus radicans, an epiphyte with red flowers that emerge from a dark red tube. A. radicans truly earns the common name the lipstick plant. Long stamen emerge from the red tubular, curved corolla. The corolla is made up of five partially fused petals. This flower shape suggests pollination by hummingbirds.

The genus is in the gesneriad family along with the African violet. The name Aeschynanthus is derived from aischyno (to be ashamed) and anthos (flower), referring to the red flowers.

Angraecum eburneum
Common Name: Comet Orchid
Family Name: Orchidaceae
Native to: Madagascar, Reunion, and the Mascarenes

The waxy white and apple-green flowers of Angraecum eburneum are pollinated by hawk moths. In the evenings, the flower releases a seductive fragrance to attract the moth, which pollinates the flower while drinking nectar from the long spur. This spur looks like a tail and is what gives Angraecums their common name of comet orchid. In the winter, A. eburneum sends out a flower spike with dozens of inverted flowers. The white fused sepals are on the top of the flower, and the three green petals dangle from the bottom of the flower.

Ascocenda
Family Name: Orchidaceae

Ascocenda is a man-made hybrid orchid genus resulting from a cross between Ascocentrum and Vanda. The hybrids often combine the large flower size of the Vanda parents with the color and compactness of the Ascocentrum parents. Ascocenda orchids prefer warm temperatures and bright light.

Ascocendas have monopodial growth habit, which means they grow vertically and reach incredible heights. Their height is compounded when a new stem forms from the end of a spent flower spike, and leaves and flowers are then produced along the new stem. Succulent leaves store the nutrients and moisture required for the new growth.

Billbergia
Family Name: Bromeliaceae
Native to: Brazil

Billbergia is a genus of flowering plants comprised of approximately 60 species in the Bromeliaceae family. Many species in this genus are endemic, or unique, to Brazil. However, the native range of Billbergia extends from southern Mexico to the West Indies, and down to Argentina. The plants in this genus are primarily epiphytic, meaning they grow on other plants for support. Billbergia can be found in a wide variety of colors, shapes, and sizes. The leaves are generally tall and tubular, forming a tight rosette, and often variegated or mottled. The showy flowers can range in brilliant displays of red, purple, pink, and blue. The genus was named in honor of Gustaf Johan Billberg (1772-1844), Swedish botanist and zoologist.

Calanthe
Family Name: Orchidaceae
Native to: Tropical and Subtropical Africa, Asia, and Australia 

Calanthes are terrestrial orchids. The genus is divided into two groups – deciduous species and evergreen species. Many of the species found in the Conservatory are deciduous. The pleated leaves shed at the end of the growing cycle, leaving behind only the pseudobulbs. The new inflorescence emerges from the pseudobulb at the start of the next season. In Greek, calanthe means “beautiful flower”. The flower’s delicate pink or white petals and sepals form a fan shape that tops the prominent lip.

Dendrochilum
Common Name: Necklace Orchid
Family Name: Orchidaceae
Native to: Southeast Asia

Dendrochilum is a genus of about 150 species of orchids. The genus is sometimes known as the necklace orchids because of their pendant-like inflorescences, or clusters of flowers. Some visitors find the distinct fragrance of the miniature, star-shaped flowers pleasant, others a bit strong and musty. Dendrochilum species grow at higher elevations in the humid rainforests throughout Southeast Asia including New Guinea, Borneo, and Java.

Guzmania conifera
Family Name: Bromeliaceae
Native to: Ecuador and Peru

Guzmanias have spectacular flowers that seemingly last forever. With a few exceptions, bromeliads are monocarpic plants. This means that once they are done flowering, the plant dies. Fortunately, the flowers usually last months and many bromeliads produce offsets from the parent plant, called pups. Guzmania conifera is a popular houseplant cultivated for its vibrant flowers and spineless leaves.

Heliconia
Common Name: Lobster Claws, False Bird-of-Paradise
Family Name: Zingiberales
Native to: Tropical Americas, Pacific Islands

Heliconia is a genus of flowering tropical plants with approximately 225 species. The majority of Heliconia species are native to tropical Central and South America; however, several species are found on islands in the West Pacific. Heliconias thrive in tropical conditions and habitats that have an abundance of water, sunlight, and rich soil. The inflorescence, or cluster of flowers, are quite distinctive and range in colorful hues of red, orange, yellow, and green. The inflorescence consists of brightly colored, waxy bracts (specialized leaves at the base of flowers) arranged alternately on the stem that encloses and protect small flowers.

Heliconias support a diversity of ecological relationships with various organisms. Hummingbirds are the principle pollination of Heliconias in the Americas. The flowers produce an abundance of nectar and the color, shape, and curve of the flowers are adapted to specific hummingbird species. Several species of Heliconia open their flowers at night to attract nectar-eating bats for pollination. Additionally, multiple species of bats use the leaves and foliage to construct habitats and shelters. Heliconia species with upright bracts are known to collect rainwater and support a community of minute, aquatic fauna. Interestingly, the name Heliconia is derived from Mount Helicon, a mountain in southern Greece that is known in Greek mythology to be the home of the Muses.

Medinilla
Family Name: Melastomataceae
Native to: Africa, Madagascar, Asia, and Pacific Islands

Medinilla is a genus of about 150 species in the family Melastomataceae. Most species are evergreen shrubs with white, pink, or orange flowers. The flowers are arranged on a panicle, a branched cluster of flowers. When pollinated, the plant bears showy berries. The leaves of many Medinilla species are arranged in a whorl or are alternating. This allows the maximum amount of sunlight to hit each leaf.

 The genus Medinilla was named in 1820 after J. de Medinilla, governor of the Mariana Islands, which are off the coast of the Philippines. There are more than 100 endemic species of Medinilla in the Philippines alone.

Nepenthes bicalcarata
Common Name: Fanged Pitcher Plant
Family Name: Nepenthaceae
Native to: Borneo

The fanged pitcher plant is a myrmecophyte noted for its mutualistic association with a species of ant, Camponotus schmitzi. Myrmecophytes are known as “ant-plant”. These plants possess adaptations that provide ants with food or shelter. In exchange, ants aid the plant in pollination, seed dispersal, defense, or gathering of essential nutrients. What makes the N. bicalcarata so unique is that the fluid in the pitcher contains far less acidic enzymes than other Nepenthes species. This is what allows the ants to survive inside the pitcher. Ants travel down the pitcher walls, drag the other drowned insects back up, and then rest the insect on the lip where it is devoured. While eating and swimming, the ants defecate in the pitcher and fertilize the plant. 

The two fangs that give N. bicalcarata its name are unique to this species and bear some of the largest nectaries in the plant kingdom. The purpose of these structures has long been debated among botanists. They have been thought to deter mammals from stealing the contents of the pitchers, though the more intelligent mammals like monkeys have been observed tearing open the side of the pitcher. Other botanists suggest that the fangs likely serve to lure insects into a precarious position over the pitcher’s mouth, where they may lose their footing and fall into the pitcher’s fluid, eventually drowning and becoming prey to the ants.  

Nepenthes rafflesiana
Common Name: Raffle's Pitcher
Family Name: Nepenthaceae
Native to: Malaysia, Sumatra, and Borneo

Nepenthes rafflesiana is a carnivorous tropical pitcher plant native to Malaysia, Sumatra, and Borneo. The pitchers of Nepenthes are modified leaves that attract, trap, and digest organism for nutrients. Nepenthes rafflesiana is highly variable in pitcher size and color and includes numerous varieties. Pitchers range in color from green to purple and are often speckled or heavily splotched in reds or purples. Each plant produces two district types of pitchers. The bulky lower pitchers of N. rafflesiana are large, squat, and winged while the upper pitchers can be narrow and funnel-shaped.

The species in named after Sir Thomas Stamford Raffles (1781-1826), a British statesman best know for founding Singapore. The genus name Nepenthes was coined by Carl Linnaeus who recalled Homer’s The Odyssey where Helen of Troy threw the drug nepenthe into wine to alleviate soldier’s sorrow.

Nepenthes truncata
Family Name: Nepenthaceae
Native to: Philippines

Nepenthes truncata is a tropical carnivorous plant endemic to the lowland rainforests of the Philippines. The pitchers of Nepenthes are modified leaves that attract, trap, and digest organism for nutrients. While the plant is relatively compact, enormous cylindrical green pitchers hang down from large heart-shaped leaves. The pitchers of N. truncata are considered one of the largest tropical pitchers. Pitchers can reach up to fourteen inches long and are adorned with prominent wings that run the length of the massive pitchers. Nepenthes truncata is endangered in its natural habitat.

Sanchezia speciosa
Family Name: Acanthaceae 
Native to: Peru and Ecuador

Sanchezia speciosa is an evergreen shrub that grows in the understory of tropical forests. The large variegated leaves have defined yellow veins and grow in an alternating pattern on the stems. The tubular yellow flowers emerge from red bracts. Many plants in the Acanthaceae family have a tubular flower or corolla and a showy bract, which helps protect the flower as it forms and attracts pollinators.

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Whether you’re a native San Franciscan, a visitor from another side of the world, or a classroom of budding botanists, the Conservatory of Flowers offers an intimate up-close experience with rare and endangered plants unlike any other. Come see what treasures await you!

Golden Gate Park | 100 John F. Kennedy Drive | San Francisco, CA 94118| 415-831-2090