From a drawing by Ch. Emonts in Jardin's Le Caféier et Le Café
The next step in classification is to place the plant in the proper division under the sub-class, which is the order. Plants are separated into orders according to their varied characteristics. The coffee plant belongs to an order known as Rubiales. These orders are again divided into families. Coffee is placed in the family Rubiaceæ, or Madder Family, in which we find herbs, shrubs or trees, represented by a few American plants, such as bluets, or Quaker ladies, small blue spring flowers, common to open meadows in northern United States; and partridge berries (Mitchella repens).
The Madder Family has more foreign representatives than native genera, among which are Coffea, Cinchona, and Ipecacuanha (Uragoga), all of which are of economic importance. The members of this family are noted for their action on the nervous system. Coffee, as is well known, contains an active principle known as caffein which acts as a stimulant to the nervous system and in small quantities is very beneficial. Cinchona supplies us with quinine, while Ipecacuanha produces ipecac, which is an emetic and purgative.
The families are divided into smaller sections known as genera, and to the genus Coffea belongs the coffee plant. Under this genus Coffea are several sub-genera, and to the sub-genus Eucoffea belongs our common coffee, Coffea arabica. Coffea arabica is the original or common Java coffee of commerce. The term "common" coffee may seem unnecessary, but there are many other species of coffee besides arabica. These species have not been described very frequently; because their native haunts are the tropics, and the tropics do not always offer favorable conditions for the study of their plants.
All botanists do not agree in their classification of the species and varieties of the coffea genus. M.E. de Wildman, curator of the royal botanical gardens at Brussels, in his Les Plantes Tropicales de Grande Culture, says the systematic division of this interesting genus is far from finished; in fact, it may be said hardly to be begun.
Coffea arabica we know best because of the important rôle it plays in commerce.
| Complete Classification of Coffee | |
| Kingdom | Vegetable |
| Sub-Kingdom | Angiospermæ |
| Class | Dicotyledoneæ |
| Sub-class | Sympetalæ or Metachlamydeæ |
| Order | Rubiales |
| Family | Rubiaceæ |
| Genus | Coffea |
| Sub-genus | Eucoffea |
| Species | C. arabica |
The coffee plant most cultivated for its berries is, as already stated, Coffea arabica, which is found in tropical regions, although it can grow in temperate climates. Unlike most plants that grow best in the tropics, it can stand low temperatures. It requires shade when it grows in hot, low-lying districts; but when it grows on elevated land, it thrives without such protection. Freeman[94] says there are about eight recognized species of coffea.