Thomas Nast

The family of the Asparagacées is a family of plants Monocotylédone S. This family does not exist in traditional Classification which compares these plants to the Liliacées. The phylogenetic classification thus separated this family from the Liliacée S and attaches it to the order of the Asparagales. In APG II (2003), a reform modified still appreciably the classification. Classification APG II offers two options:

General description

  • Asparagacées are generally originating in the hot and subtropical moderate areas, where they are largely widespread.

The root and stem

  • It is, either of the perennial herbaceous plants rhizomateuses, or of the liana S.
  • Certaines species are described as Arbrisseau X, even if, of course, the monocotylédones have neither true trunks nor secondary formation of Bois.
  • the chlorophyllian function is often transferred to the stems.

Sheets

  • One of the characteristics of this family is the very reduced sheets, generally until the state of more or less thorny scales. They often give up their chlorophyllian functions.
  • the sheets are deprived of Stipule S.
  • the sheets should not be confused with the Cladode S, of many and short flat, visible branches on the stems. They are these cladodes which ensures chlorophyllian operation.

  • It is nevertheless important to point out that the introduction of new kinds into the family, by the APG II calls in question this traditional description of the sheets of Asparagacées.

Flowers

  • According to the species, one finds all the great diagrams of reproduction: the seedlings are either Monoïque S, or Dioïque S, one finds cases of Hermaphrodisme, of Polygamie.
  • It results from it from the various inflorescences: the flowers can be solitary or grouped in Cyme, Ombelle or Grappe.
  • the flowers are small and regular (cyclic).
  • the Périanthe is composed of three petals and three sepals, indissociable. These six Tépale S either free or are welded. The flowers are thus basically trimères.
  • the six tepals have the aspect of petals (petaloid), that is to say the aspect of sepals (sepaloid).
  • the Androcée contains 6 fertile cheesecloths all laid out on two verticils (diplostémones). The Anthère S seem to be inserted by their dorsal part (dorsifixes) and open towards the interior of the flower (introrse). Finally the déhiscence of the anthères is longitudinal.
  • gynécée is made of three Carpelle S welded. The ovaries, triloculaires, are supères. Each flower has only one style but with two to twelve ovules per cabin, which have a placentation axile. The ovules take multiple positions according to the species.

Fruit

  • Typically, the fruit is a bay.
  • the seeds are albuminous (more or less according to the kinds and species)
  • the embryo can be right until curved.

The standard kind

The standard kind is Asparagus , kind which counts several species.
  • Let us quote Asparagus officinalis , the asparagus of our tables, which is cultivated in France. This asparagus is also subspontanée in the neighborhoods of the gardens. Asparagus acutifolius is wild asparagus of the South of France.
  • the kind Asparagus provides also decorative plants, the asparaguses: Asparagus plumosus , the asparagus of the florists; Asparagus sprenger and the “tail of rat” ( Asparagus exuvialis ), plants of external ornament; Asparagus densiflorus or Asparagus densiflorus meyeri , house plants.
  • Asparagus officinalis , the common asparagus is also used for the ornamentation, dried with red bays left on the plant.

In France

Asparagacées ( lato sensu ) include/understand for France the following kinds:

Remarks

  • Certain plants, like the true hyacinth or the Scille S have clearly chlorophyllian sheets. If the introduction of these kinds into asparagacées were definitively adopted, the description of the family will have to be re-examined.
  • In classification APG II (2003) the family lato sensu includes the Hyacinthaceae and this group can become a subfamily, the Hyacinthoideae .

External bonds

  • regional photographic Flora

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