Interest-anggrekan or orchids Orchidaceae is a member of the tribe of flowering plants with the highest type. The types are widespread from the tropics to wet circumpolar region, although most members were found in the tropics. Most members of this tribe live as epiphytes, especially those from tropical regions. Orchids in the temperate regions usually live in soil and tuber shape as a way to adapt to winter. Organs which tend to be thick and "fleshy" (succulent) makes it stand the pressure of water availability. Epiphytic orchids can live from the dew and damp air.
Members of the importance of a well known man is the ornamental orchids and vanili.berkelopak beautiful flowers and colorful
The characteristics of botany
Members of these tribes tend to have a succulent organs or "fleshy": thick with high water content. Thus he can live in conditions of low water availability. Water is obtained from the rain, drops, dew, or moisture in the air. However, orchids are not found in desert regions because the roots are not intensive. Orchids like light but not direct sunlight so that he usually found in nature as plant floor or under the auspices of the forest. As ornamental plants, orchids stand in the room.
Root fibers, not inside. The types of the developing root succulent epiphytes and attached to the trunk where the tree grows, but does not harm the host tree. There is also a growing geofitis, with other terms means terrestria grown in soil with roots in the soil. There is also a saprophyte, growing on the media leaves and decayed wood that has decayed into humus. At the root surface are often found root fungus (mycorrhiza) are symbiotic with orchids.
Jointed stems of orchids. Orchids that live in soil ("orchids") stems short and tend to resemble bulbs. Meanwhile, the trunk epiphytic orchids grow well, often thickened and covered a layer of wax to prevent excessive evaporation. Stem growth can be "elongated" (monopodial) or "wide" (simpodial), depending on the genus.
Orchid leaves are usually oval-elongated with elongated leaves the bone anyway, typical monocot leaf. The leaves can also be thickened and serve as water storage.
Typical orchid-shaped flowers and a penciri that distinguishes it from other tribe members. Orchid flowers arrayed compound, arises from the elongated flower stalks, leaves emerge from the armpit. The flowers are bilateral symmetry. Strands of flower petals (sepals) is usually colored like petals (so-called tepals). One strand of the modified petals form a kind of "tongue" that protects an accessory structure that carries the stamens and pistil. Stamens have very short stalks with two small disc-shaped anthers (called "pollinia") and protected by a small structure that must be opened by insect pollinators (or humans for vanilla) and carry pollen to the pistil of the mouth. Without the help of organisms pollinators, pollination will not occur.
Fruit orchid-shaped capsule that is green and when ripe dry and open from the side. Seeds are small and lightweight, so easy in the wind. Orchid seeds do not have a network storage of food reserves and even the embryo has not yet reached perfect maturity. New germination occurs when seeds fall on the corresponding medium and continue its development until maturity.
from : wikipedia
picture from : flora.huh.harvard.edu
for more information click on this link : http://id.wikipedia.org/wiki/Orchidaceae
0 comments:
Post a Comment