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A genus of plants cultivated for medicinal use and as a food. About twenty species have been described.

Rhubarb

A genus of plants cultivated for medicinal use and as a food. About twenty species have been described.

This is an illustration of raphides, or acicular crystals, from the stalk of the Rhubarb: three of the cells contain chlorophyll, and two of them raphides.

Raphides

This is an illustration of raphides, or acicular crystals, from the stalk of the Rhubarb: three of the…

A perennial plant with many short red stems and green leaves. Commonly used in cooking.

Medicinal Rhubarb

A perennial plant with many short red stems and green leaves. Commonly used in cooking.

The forcing of rhubarb

Rhubarb

The forcing of rhubarb

Some cells from stalk of Rhubarb-plant, three containing chlorophyll; two (one torn across) with rhaphides.

Rhubarb-plant

Some cells from stalk of Rhubarb-plant, three containing chlorophyll; two (one torn across) with rhaphides.

Rhubarb-beetle of the Lixus concauis species; larva.

Beetle

Rhubarb-beetle of the Lixus concauis species; larva.

Rhubarb-beetle of the Lixus concauis species; pupa.

Beetle

Rhubarb-beetle of the Lixus concauis species; pupa.

The Chilean Rhubarb (Gunnera tinctoria) is a large-leaved plant in the Gunneraceae family. It was also known as the synonym Gunnera scabra.

Chilean Rhubarb

The Chilean Rhubarb (Gunnera tinctoria) is a large-leaved plant in the Gunneraceae family. It was also…

A herbaceous plant with large leaves and edible petioles.

Rhubarb

A herbaceous plant with large leaves and edible petioles.

Illustrated is a cross section of a greenhouse used for growing lettuce and cucumbers. The slanting side toward the right (north) is boarded and used for forcing rhubarb. The cucumber plants are trained vertically.

Greenhouse for Lettuce and Cucumber

Illustrated is a cross section of a greenhouse used for growing lettuce and cucumbers. The slanting…