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Українські рефератиРусские рефератыКниги
НазваRose (реферат)
РозділІноземна мова, реферати англійською, німецькою
ФорматWord Doc
Тип документуРеферат
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Rosa arvensis (Field Rose)


A rose is a flowering HYPERLINK ""

\o "Shrub" shrub of the HYPERLINK

"" \o "Genus" genus Rosa and the

HYPERLINK "" \o "Flower" flower of

this shrub. There are more than a hundred HYPERLINK

"" \o "Species" species of wild

roses, all from the HYPERLINK

"" \o "Northern

hemisphere" northern hemisphere and mostly from temperate regions. The

species form a group of generally thorny HYPERLINK

"" \o "Shrub" shrubs or HYPERLINK

"" \o "Liana" climbers , and

sometimes trailing plants, reaching 2-5 m tall, rarely reaching as high

as 20 m by climbing over other plants.


The HYPERLINK "" \o "Leaf" leaves

of most species are 5-15 cm long, pinnate, with (3-) 5-9 (-13) leaflets

and basal stipules; the leaflets usually have a serrated margin, and

often a few small thorns on the underside of the stem. The vast majority

of roses are HYPERLINK "" \o

"Deciduous" deciduous , but a few (particularly in southeast

HYPERLINK "" \o "Asia" Asia ) are

HYPERLINK "" \o "Evergreen"

evergreen or nearly so.


The HYPERLINK "" \o "Flower"

flowers have five petals (with the exception of HYPERLINK

"" \o

"Rosa sericea" Rosa sericea which often has only four), usually white

or pink, in a few species yellow or red. The ovary is inferior,

developing below the petals and sepals.


The HYPERLINK "" \o "Fruit" fruit

of the rose is a berry-like structure called a HYPERLINK

"" \o "Rose hip" rose hip . The

hips of most species are red, but a few (e.g. Rosa pimpinellifolia) have

dark purple to black hips. Each hip comprises an outer fleshy layer, and

inside containing 5-25 HYPERLINK ""

\o "Seed" seeds (technically HYPERLINK

"" \o "Achene" achenes ) embedded in

a matrix of fine, but stiff, hairs. Rose hips of some species,

especially the HYPERLINK "" \o

"Dog Rose" Dog Rose (Rosa canina) and HYPERLINK

"" \o "Rugosa Rose" Rugosa Rose

(Rosa rugosa), are very rich in HYPERLINK

"" \o "Vitamin C" vitamin C ,

among the richest sources of any plant. The hips are eaten by

fruit-eating HYPERLINK "" \o "Bird"

birds such as HYPERLINK

"" \o "Thrush (bird)"

thrushes and HYPERLINK "" \o

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