Osmanthus flower: An evergreen shrub or small tree of the genus Xylariaceae, one of the top ten traditional flowers in China.
"Autumn equinox" should be the season of fragrant dangui, but this year's osmanthus flowers do not seem to like "according to the convention", the full blooming period is generally later than in previous years, which really makes the citizens who are looking forward to appreciating the guizhou can't wait!
Shanghai's first wave of osmanthus flowers is late
In the early morning of September 22, the early silver gui of the Shanghai Botanical Garden finally opened. This is the latest opening since the Shanghai Botanical Garden had phenological records. Compared with the "earliest record" of flowering on July 20 last year, this year's cinnamon is a full 63 days late.
The flowering time of early silver laurel is mostly in early September, and some are advanced to late August, but the flowering in late September is a "historic breakthrough", and the first wave of flowers last year and this year is the two most extreme records so far.
Early silver laurel must pass the temperature below 21 degrees Celsius before the flower buds can transform into buds. The expansion of the buds also requires a temperature of 4-5 days. Due to the influence of El Niño and the urban greenhouse effect in recent years, the temperature rise and fall has been unstable, making the flowering period of osmanthus become "irregular".
Different "osmanthus flowers" National Day "blooming"
At present, in addition to the previous early silver laurel bloom in the Gui Garden of Shanghai Botanical Garden, the wall of the gui garden bathroom has also "bloomed" four kinds of famous gui, which are: golden gui, silver gui, dan gui, and four seasons gui.
What are the varieties of osmanthus flowers?
Do you know how to distinguish these four kinds of osmanthus flowers?
From the point of view of patterns
Relatively speaking, the four seasons of laurel are easier to distinguish, its leaves are slightly rounded, almost no tail tip, the other three strains of osmanthus leaves are relatively narrow and long, with a distinct tail tip. Moreover, the four seasons of laurel are clumpy shrub-like, low in shape and short in branches, and the rest of the strains are trees or small trees.
Judging from the color of the leaves
The new leaves of the four seasons are dark red, and the old ripe leaves are green or yellow-green; the leaves of dangui are the darkest in color, which is dark green; the golden laurel is dark green and shiny; and the silver laurel leaves are the lightest in color, and the leaves are green or turquoise. In the case of low light, the leaf color difference is more obvious.
Judging from the décor
1, the flowers of dangui are orange and yellow in color, and the smell is strong.
2. The flower color of golden osmanthus is golden yellow, and the fragrance is lighter.
3, silver laurel flowers are off-white, the fragrance is lighter.
4. The flower color of the four seasons of osmanthus is pale yellow, and the fragrance is the lightest of the four.
Why are osmanthus flowers so fragrant?
After a gentle rain, the osmanthus flowers will bloom and their fragrance is pleasant. The fragrance of osmanthus is far away, we often smell the flowers first and do not see the flowers, so sometimes we wonder, why are the osmanthus flowers so fragrant?
First of all, let's look at what is osmanthus flower.
Osmanthus flower, also known as wood rhinoceros, is a genus of wood rhinoceros in the family Wood Rhinoceros, and the flowers of the plants in this genus have a fragrant fragrance.
Why can we smell its aroma?
Osmanthus contains many kinds of aromatic substances such as alkenes, ketones, alcohols, etc., most of which are highly volatile, so they will smell the fragrance within a certain range. That is to say, osmanthus flowers are rich in volatile oils in its flowers.
The compounds contained in volatile oils mainly include basilene (ocimene), pinene, ionone, linalool, β-cressene (β-phellandrene), nerrol and so on. These aromas are not only found in osmanthus flowers, but also in other fragrant flowers or fruits that we commonly see, there is also a volatile oil on them. Therefore, the fragrance of osmanthus can be simply understood as a combination of dozens of flower and fruit aromas.
Why can the fragrance of osmanthus float so far?
Or because of the aromatic oil, the aromatic oil on the petals of the osmanthus flower is continuously secreted through the metabolism of the plant cells, and most of the aromatic oil secreted by the plant is volatile, and it is emitted with the water in the air, so the breeze wafts through to bring cinnamon.