Flora

(redirected from floras)
Also found in: Dictionary, Thesaurus, Medical.

Flora,

in Roman religion, goddess of flowers and fertility. Her festival, the Floralia, Apr. 28–May 1, was celebrated with great gaiety and licentiousness.

Flora

 

the historically formed aggregate of plant species unique to a definite geographic area owing to present natural conditions and to the geological past. The flora of one region is in more or less stable relationship with the flora of other, especially adjacent, regions. Theoretically the term “flora” embraces all the plants of a given territory, but in practice it often refers only to seed plants and ferns of the area being studied. Aggregates of lower and other higher plants are usually given such designations as the flora of spore plants, the flora of algae, and the flora of mosses. Imported naturalized plants, in particular weeds, are considered a natural link in the chain of a flora.

The makeup of a particular flora is to some extent arbitrary, since it depends on the size of the region under study. The object of study and description may be the flora of a country, for example, the flora of the USSR. Sometimes the flora of only certain parts of a country is studied, for example, the flora of Leningrad Oblast. Also studied are the floras of territories independent in respect to their natural history (for example, the Caucasus or Middle Russia), botanicogeographic regions, (for example, Manchuria or Antarctica), or parts of the earth that are more or less isolated by natural boundaries (for example, Iceland and Kamchatka).

Analysis of a particular flora is based on the species and genus composition. The various species are subdivided according to specific characteristics into elements of the flora. Specifically, geographic elements unite species with the same geographic distribution, and genetic elements unite species that are closely related in geographic origin and history of distribution. In the course of botanicogeographic (geographic and genetic) analysis, the relationship of the flora under study with other floras is determined. Ecophytocenological analysis delimits elements of flora according to their connection with ecological conditions and with various types of vegetation. Age analysis makes it possible to identify progressive (young in time of origin and in time of distribution), conservative, and relict elements. Relicts are regarded as survivals of past states of the vegetational cover. The availability of paleobotanical data makes it possible to determine the age of certain elements of a flora and the time the elements became part of the flora.

One of the most important features of a flora is the systematic structure, that is, the existence of representatives of various systematic groups that are characteristic of various botanicogeographic regions. There are definite quantitative ratios between each group. Changes in these ratios are among the most important factors in the comparative characterization of floras.

In the first approximation the richness of a flora is determined according to an inventory of the various species and genera. However, the dependence of the number of species and genera on the size of the habitat of each flora hampers a comparative evaluation of the richness of floras. Methods for comparative study of floras are needed that ensure the comparability of juxtaposed data—approximate equality of the quantitative indexes that characterize various floras. The method of studying specific floras yields the best possibilities for comparative determination of the richness of floras. Analysis of the inventory of species and genera, particularly geographic and genetic analysis, and a comprehensive comparative interpretation serve as the basis for floristic regionalization of the earth.

The term “flora” is the traditional heading for comprehensive treatises on the systematic composition of the plant world in a given region. Floras contain detailed descriptions of plant species, keys for identification, data on growth conditions and geographic distribution (on the territory encompassed by the flora and throughout the world), and information about economically important properties and uses of the plants. The territory covered by an individual flora is determined by the extent of field work conducted in preparation for publication. Many floras summarize the knowledge of the systematic composition of the plant world of a given territory, thereby serving as an important basis for further botanical study.

REFERENCES

Grossgeim, A. A. Analiz flory Kavkaza. Baku, 1936.
Tolmachev, A. I. O kolichestvennoi kharakteristike flor i floristicheskikh oblastei. Moscow-Leningrad, 1941.
Tolmachev, A. I. Vvedenie v geografiiu rastenii. Leningrad, 1974.
Vul’f, E. V. Istoricheskaia geografiia rastenii: Isloriia flor zemnogo shara. Moscow-Leningrad, 1944.
Alekhin, V. V., L. V. Kudriashov, and V. S. Govorukhin. Geografiia rastenii s osnovami botaniki, 2nd ed. Moscow, 1961.

A. I. TOLMACHEV


Flora

 

in Roman mythology, the goddess of flowers, youth, and spring flowering. The Floralia, a festival celebrated in honor of Flora, consisted of games that sometimes took on a licentious character. In art Flora has frequently been depicted as a young girl with flowers; the goddess has been the subject of works by many great artists, including Titian, Poussin, and Rembrandt.

flora

[′flȯr·ə]
(botany)
Plants.
The plant life characterizing a specific geographic region or environment.

Flora

goddess of this season. [Rom. Myth.: Hall, 130]
See: Spring

flora

1. all the plant life of a given place or time
2. a descriptive list of such plants, often including a key for identification
3. short for intestinal flora
References in classic literature ?
Was it possible that Flora could have been such a chatterer in the days she referred to?
Indeed I have little doubt,' said Flora, running on with astonishing speed, and pointing her conversation with nothing but commas, and very few of them, 'that you are married to some Chinese lady, being in China so long and being in business and naturally desirous to settle and extend your connection nothing was more likely than that you should propose to a Chinese lady and nothing was more natural I am sure than that the Chinese lady should accept you and think herself very well off too, I only hope she's not a Pagodian dissenter.
I am not,' returned Arthur, smiling in spite of himself, 'married to any lady, Flora.
Dear dear,' said Flora, 'only to think of the changes at home Arthur--cannot overcome it, and seems so natural, Mr Clennam far more proper--since you became familiar with the Chinese customs and language which I am persuaded you speak like a Native if not better for you were always quick and clever though immensely difficult no doubt, I am sure the tea chests alone would kill me if I tried, such changes Arthur--I am doing it again, seems so natural, most improper--as no one could have believed, who could have ever imagined Mrs Finching when I can't imagine it myself
A certain anger rose within him; here was a Flora he disowned; she was hard; she was of a set colour; a settled, mature, undecorative manner; plain of speech, plain of habit - he had come near saying, plain of face.
A voice told him this was Flora, after all - told him so quietly, yet with a thrill of singing.
You, Flora, you can pack John into my bed, for which I have no further use to- night.
My dear Flora,' returned Alexander, 'a pound note won't see us very far; and besides, this is my father's business, and I shall be very much surprised if it isn't my father who pays for it.
It isn't so easy for a girl like Flora de Barral to become a factory hand, a pathetic seamstress or even a barmaid.
So that, when that unpleasant young man ran off, I found myself alone with Flora.
But I had not been there to see the face of Flora at the time.
She was accordingly allowed to see Flora de Barral in Mrs.