Purpose of the Semi-Technical Description
When a taxonomist examines a flowering plant for identification or record-keeping, the description is not written as a casual narrative but follows a fixed, standard sequence of characters. This ordered format is called a semi-technical description: "semi-technical" because it uses precise botanical terminology for each character (making it more exact than a plain descriptive account) while still being written out in readable phrases and sentences rather than reduced entirely to symbols and abbreviations (which would make it a fully technical or telegraphic description). Following a fixed sequence every time makes descriptions of different plants directly comparable to one another, and ensures that no important character is accidentally left out.
Habit and Habitat
The description opens by recording the plant's habit — whether it is an herb, shrub, tree, or climber — and its habitat, meaning the kind of environment in which it typically grows (for example, common wayside places, cultivated fields, or a particular climatic zone). This gives an immediate, general picture of the plant before any detailed characters are considered.
Vegetative Characters
Next, the vegetative parts are described in a fixed order: root, stem, and leaf. The root system is noted as tap root or adventitious/fibrous, and any special features such as root nodules are mentioned. The stem is described for its nature (herbaceous or woody), form (erect, climbing, or twining), and any special modifications. The leaf is described for its type (simple or compound), arrangement (alternate, opposite, or whorled — phyllotaxy), venation (reticulate or parallel), and the presence or absence of stipules. These vegetative characters, although less emphasized in identification than floral characters, still provide useful supporting evidence for placing a plant in its correct family, and unusual vegetative features (such as the geocarpic fruiting habit seen in a few plants, where the fruit matures underground after the flower stalk pushes it into the soil, as in groundnut) are noted here as well.
Floral Characters …