Definition: Shaped like an egg but with the wider end at the top and the narrower end at the bottom.

Example: The plant has obovate leaves that are easy to identify.

Definition: Describing a condition where two opposite leaves or petals overlap each other, often seen in botany.

Example: The obvolute arrangement of the leaves allowed for better sunlight exposure.

Definition: A plant from the Andes that produces edible tubers, often cultivated in South America, especially in Peru.

Example: We cooked oca tubers for dinner, and they were delicious.

Definition: A type of sheath or covering, especially around the stem of certain plants, particularly in the family Polygonaceae.

Example: The ochrea protects the young shoots of the plant as they grow.

Definition: A type of plant that looks like a cactus, found in Mexico and the southwestern United States, known for its clusters of bright red flowers.

Example: The ocotillo blooms beautifully in the spring, attracting many hummingbirds.

Definition: A type of orchid that belongs to a specific genus, known for its beautiful flowers and often cultivated in tropical regions.

Example: The gardener showcased a stunning odontoglossum in the flower exhibition.

Definition: A type of tree, especially known as the Malay apple, which is often distinguished from other related trees by its specific names.

Example: The ohia tree is an important part of the local ecosystem in Hawaii.

Definition: A type of spore produced by certain fungi, often associated with powdery mildew, particularly in plants like grapes.

Example: The vineyard was affected by oidium, leading to a significant loss of grapes.

Definition: A type of seed from certain plants that is grown primarily to produce vegetable oil.

Example: Farmers often grow oilseed crops to meet the demand for cooking oil.

Definition: A type of berry that is a mix between a loganberry and a youngberry, known for its tart flavor and elongated shape, commonly found on the west coast of the United States.

Example: I made a delicious pie using fresh olallieberries from the farmer's market.