Nature · Editorial deck
Green World
The plants, trees and flowers that cover the planet
Your path through the deck
Learn it chapter by chapter.
Start with a chapter that catches your eye, or mix a few together in your round.
- 01Trees and forests10 cards · ~2 min
- 02Flowers and unusual adaptations7 cards · ~1 min
- 03Crops and other plant life9 cards · ~2 min
Taste it
Three cards to begin.
Searchable preview
The questions inside.
01This plant, among Earth's largest trees by volume, includes individuals estimated over 3,000 years old.RECALL
Giant SequoiaThe giant sequoia, among Earth's largest trees by volume, includes individuals estimated over 3,000 years old.
Share this card ↗Source: Sequoiadendron giganteum ↗02This tree has a swollen water-storing trunk and is strongly associated with Madagascar and mainland Africa.IDENTIFY
Baobab TreeThe baobab stores water in its massive trunk, earning it the nickname tree of life in dry regions.
Share this card ↗Source: Adansonia ↗03This plant, one of the fastest-growing plants, can grow nearly a meter in a single day in some species.RECALL
BambooBamboo, one of the fastest-growing plants, can grow nearly a meter in a single day in some species.
Share this card ↗Source: Bamboo ↗04This plant, the tallest tree species on Earth, can grow taller than a 30-story building.RECALL
Coast RedwoodThe coast redwood, the tallest tree species on Earth, can grow taller than a 30-story building.
Share this card ↗Source: Sequoia sempervirens ↗05Acorns are the fruits of this tree genus, Quercus.IDENTIFY
Oak TreeOak trees produce acorns and can live for many centuries, among the longest-lived trees.
Share this card ↗Source: Oak ↗06These large brown algae form underwater forests in many cool coastal waters.RECALL
KelpKelp forms dense underwater forests, with some species growing over half a meter in a single day.
Share this card ↗Source: Kelp ↗07This salt-tolerant coastal tree often has exposed roots that help stabilize tidal shorelines.IDENTIFY
MangroveMangroves grow in coastal saltwater and use tangled roots to help protect shorelines from erosion.
Share this card ↗Source: Mangrove ↗08This spring flower, called sakura in Japanese, is celebrated during hanami viewing gatherings.IDENTIFY
Cherry BlossomCherry blossoms have a brief spring blooming season celebrated with major festivals, especially in Japan.
Share this card ↗Source: Cherry blossom ↗09Certain species of this tree provide sap boiled into syrup; a leaf represents Canada.IDENTIFY
Maple TreeMaple trees are known for vivid autumn color, and some species yield sap that becomes maple syrup.
Share this card ↗Source: Maple ↗10This plant's buoyant seeds can survive long ocean voyages, helping the tree spread to new shores.RECALL
Coconut PalmThe coconut palm's buoyant seeds can survive long ocean voyages, helping the tree spread to new shores.
Share this card ↗Source: Coconut ↗11This plant, native to a small Carolina coastal region, snaps shut to trap unsuspecting insects.RECALL
Venus FlytrapThe Venus flytrap, native to a small Carolina coastal region, snaps shut to trap unsuspecting insects.
Share this card ↗Source: Venus flytrap ↗12Young heads of this tall, yellow-petalled crop track the sun; mature heads typically face east.IDENTIFY
SunflowerYoung sunflowers track the sun across the sky, though mature flowers typically settle facing east.
Share this card ↗Source: Sunflower ↗13This plant can live over 150 years and typically doesn't grow its first arm for several decades.RECALL
Saguaro CactusThe saguaro cactus can live over 150 years and typically doesn't grow its first arm for several decades.
Share this card ↗Source: Saguaro ↗14This flowering-plant family includes vanilla and species with elaborate flowers adapted to particular pollinators.IDENTIFY
OrchidOrchids form one of the largest flowering plant families, with tens of thousands of natural species.
Share this card ↗Source: Orchidaceae ↗15This plant produces the largest individual flower of any plant, known for its rotting-flesh smell.RECALL
RafflesiaRafflesia produces the largest individual flower of any plant, known for its rotting-flesh smell.
Share this card ↗Source: Rafflesia ↗16Fronds and spore-producing sori characterize many members of this seedless vascular plant group.IDENTIFY
FernFerns reproduce with spores rather than seeds and existed on Earth long before flowering plants evolved.
Share this card ↗Source: Fern ↗17This plant, symbolically important in several cultures, has leaves and flowers that naturally repel water and dirt.RECALL
LotusThe lotus, symbolically important in several cultures, has leaves and flowers that naturally repel water and dirt.
Share this card ↗Source: Nelumbo nucifera ↗18Flowers of the genus Rosa are widely cultivated for fragrance; their stems commonly bear prickles.RECALL
RoseThe rose has been cultivated by humans for thousands of years for its fragrance and beauty.
Share this card ↗Source: Rose ↗19This plant's leaves grow large enough that some can support the weight of a small child.RECALL
Giant Water LilyThe giant water lily's leaves grow large enough that some can support the weight of a small child.
Share this card ↗Source: Victoria (plant) ↗20This plant lacks true roots and instead absorbs water and nutrients directly through its surface.RECALL
MossMoss lacks true roots and instead absorbs water and nutrients directly through its surface.
Share this card ↗Source: Moss ↗21This cereal crop provides the flour traditionally used in most European-style bread and pasta.RECALL
WheatWheat, one of the most widely grown cereal grains, serves as a staple food for much of the world.
Share this card ↗Source: Wheat ↗22This plant feeds more than half the world's population and is typically grown in flooded paddies.RECALL
RiceRice feeds more than half the world's population and is typically grown in flooded paddies.
Share this card ↗Source: Rice ↗23This plant, domesticated in the Americas, is known internationally by its other common name, maize.RECALL
CornCorn, domesticated in the Americas, is known internationally by its other common name, maize.
Share this card ↗Source: Maize ↗24Bulbs of this flower became the focus of a speculative frenzy in the seventeenth-century Netherlands.RECALL
TulipThe tulip sparked a famous 17th-century economic frenzy in Holland known as tulip mania.
Share this card ↗Source: Tulip ↗25This evergreen climbing vine, Hedera helix, attaches with aerial rootlets and can be invasive outside its native range.RECALL
English IvyEnglish ivy clings tightly to surfaces as it climbs, and can become invasive outside its native range.
Share this card ↗Source: Hedera helix ↗26This plant's fragrant purple fields are a famous sight across southern France, prized in perfumes.RECALL
LavenderLavender's fragrant purple fields are a famous sight across southern France, prized in perfumes.
Share this card ↗Source: Lavandula ↗
Ready when you are
Flip the first card.
Study at your pace, or test what stayed with you. Your local progress is saved as you go.