Genus

Genus (Plural Genera) [ Taxonomy ]

Dictionary of botanic terminology - index of names


	In the binomial classification of living organisms The genus. (pl. genera) is a grouping of similar, closely related and morphologically similar species.

Similarly, genera are grouped into families, families into orders, orders into classes, and classes into phyla or divisions.

Further a genus may be divided in subgenus (intermediate taxonomic group between genus and species)

Glossary of cactus and succulent GENUS names
Glossary of cactus and succulent SPECIES epithets (comprising subspecies, variety and forms too)

How to write the genus name (generic name):


1. The genus name is written first. 2. The genus name is always underlined or italicized. 3. The first letter of the genus name is always capitalized. Example: Mammillaria or Mammillaria

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Holdfast roots [ Botany ]
Dictionary of botanic terminology - index of names

Some species of climbing plants develop holdfast roots which help to support the vines on trees, walls, and rocks. By forcing their way into minute pores and crevices, they hold the plant firmly in place.

Climbing plants, like the poison ivy (Toxicodendron radicans), Boston ivy (Parthenocissus tricuspidata), and trumpet creeper (Campsis radicans), develop holdfast roots which help to support the vines on trees, walls, and rocks. By forcing their way into minute pores and crevices, they hold the plant firmly in place. Usually the Holdfast roots die at the end of the first season, but in some species they are perennial. In the tropics some of the large climbing plants have hold-fast roots by which they attach themselves, and long, cord-like roots that extend downward through the air and may lengthen and branch for several years until they strike the soil and become absorbent roots.

Major references and further lectures:
1) E. N. Transeau “General Botany” Discovery Publishing House, 1994