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Flower Preservation
Flower preservation has existed since early Human history, history, although deliberate flower preservation is a more recent phenomenon. In the Middle East, the bones of pre-historic man were discovered with delicate wild flowers probably as a tribute to a passing loved one. Evidence of deliberate use of specific flowers is indicated by the pollen grains that were present. Brightly colored and vivid flowers were also found in Ancient Egypt, Egyptian tombs. These flowers were approximated to be 4,000 years old. In the sixteenth century medicinal nosegays began to give way to ornamental ones. Flowers essentially started to be used for decorative purposes such as jewels, fans and gloves. During the Elizabethan era, Elizabethan Age the once familiar ruff was replaced by soft lacy collars, and bosom flowers also became popular. Out of the Victorian era grew the fascination of communicating with flowers carried in the nosegays. The idea of the language of flowers developed, when i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mildew
Mildew is a form of fungus. It is distinguished from its closely related counterpart, mould, largely by its colour: moulds appear in shades of black, blue, red, and green, whereas mildew is white. It appears as a thin, superficial growth consisting of minute hyphae (fungal filaments) produced especially on living plants or organic matter such as wood, paper or leather. Both mould and mildew produce distinct offensive odours, and both have been identified as the cause of certain human ailments. In horticulture, mildew is either species of fungus in the order Erysiphales, or fungus-like organisms in the family ''Peronosporaceae''. It is also used more generally to mean mould growth. In Old English, mildew meant honeydew (a substance secreted by aphids on leaves, formerly thought to distill from the air like dew), and later came to mean mould or fungus. Mildew grows on damp cloth, leather, or on plants, and growing on leaves can damage the plant. Household varieties The term ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Silica Gel
Silica gel is an amorphous and porous form of silicon dioxide (silica), consisting of an irregular tridimensional framework of alternating silicon and oxygen atoms with nanometer-scale voids and pores. The voids may contain water or some other liquids, or may be filled by gas or vacuum. In the last case, the material is properly called silica xerogel. Silica xerogel with an average pore size of 2.4 nanometers has a strong affinity for water molecules and is widely used as a desiccant. It is hard and translucent, but considerably softer than massive silica glass or quartz; and remains hard when saturated with water. Silica xerogel is usually commercialized as coarse granules or beads, a few millimeters in diameter. Some grains may contain small amounts of indicator substance that changes color when they have absorbed some water. Small paper envelopes containing silica xerogel pellets, usually with a "do not eat" warning, are often included in dry food packages to absorb any h ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Convection
Convection is single or multiphase fluid flow that occurs spontaneously due to the combined effects of material property heterogeneity and body forces on a fluid, most commonly density and gravity (see buoyancy). When the cause of the convection is unspecified, convection due to the effects of thermal expansion and buoyancy can be assumed. Convection may also take place in soft solids or mixtures where particles can flow. Convective flow may be transient (such as when a multiphase mixture of oil and water separates) or steady state (see Convection cell). The convection may be due to gravitational, electromagnetic or fictitious body forces. Heat transfer by natural convection plays a role in the structure of Earth's atmosphere, its oceans, and its mantle. Discrete convective cells in the atmosphere can be identified by clouds, with stronger convection resulting in thunderstorms. Natural convection also plays a role in stellar physics. Convection is often categorised or d ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Zinnia
''Zinnia'' is a genus of plants of the tribe Heliantheae within the family Asteraceae. They are native to scrub and dry grassland in an area stretching from the Southwestern United States to South America, with a centre of diversity in Mexico. Members of the genus are notable for their solitary long-stemmed 12 petal flowers that come in a variety of bright colors. The genus name honors German master botanist Johann Gottfried Zinn (1727–59). Description Zinnias are annuals, shrubs, and sub-shrubs native primarily to North America, with a few species in South America. Most species have upright stems but some have a lax habit with spreading stems that mound over the surface of the ground. They typically range in height from 10 to 100 cm tall (4" to 40"). The leaves are opposite and usually stalkless (sessile), with a shape ranging from linear to ovate, and a color ranging from pale to medium green. Zinnia's composite flowers consist of ray florets that surround disk florets ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cornflower
''Centaurea cyanus'', commonly known as cornflower or bachelor's button, is an annual flowering plant in the family Asteraceae native to Europe. In the past, it often grew as a weed in cornfields (in the broad sense of "corn", referring to Food grain, grains, such as wheat, barley, rye, or oats), hence its name. It is now endangered species, endangered in its native habitat by agriculture, agricultural intensification, particularly by over-use of herbicides. However, ''Centaurea cyanus'' is now also naturalisation (biology), naturalised in many other parts of the world, including North America and parts of Australia through introduction as an ornamental plant in gardens and as a seed contaminant in crop seeds. Description ''Centaurea cyanus'' is an annual plant growing to 40–90 cm tall, with grey-green branched stems. The leaves are lanceolate and 1–4 cm long. The flowers are most commonly an intense blue colour and arranged in inflorescence, flowerheads (capitul ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chrysanthemum
Chrysanthemums (), sometimes called mums or chrysanths, are flowering plants of the genus ''Chrysanthemum'' in the family Asteraceae. They are native to East Asia and northeastern Europe. Most species originate from East Asia and the center of diversity is in China.Liu, P. L., et al. (2012)Phylogeny of the genus ''Chrysanthemum'' L.: Evidence from single-copy nuclear gene and chloroplast DNA sequences.''PLOS One'' 7(11), e48970. . Countless horticultural varieties and cultivars exist. Description The genus ''Chrysanthemum'' are perennial herbaceous flowering plants, sometimes subshrubs. The leaves are alternate, divided into leaflets and may be pinnatisect, lobed, or serrate (toothed) but rarely entire. The compound inflorescence is an array of several flower heads, or sometimes a solitary head. The head has a base covered in layers of phyllaries. The simple row of ray florets is white, yellow, or red. The disc florets are yellow. Pollen grains are approximately 34 mic ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tagetes
''Tagetes'' () is a genusSoule, J. A. 1996. Infrageneric Systematics of Tagetes. Pgs. 435-443 in Compositae: Systematics, Proceedings of the International Compositae Conference, Kew 1994, Vol. I, Eds. D.J.N. Hind & H.J. Beentje. of annual or perennial, mostly herbaceous plants in the family Asteraceae. They are among several groups of plants known in English as marigolds. The genus ''Tagetes'' was described by Carl Linnaeus in 1753. These plants are native to Mexico, growing naturally since Mexico's valley down to the south and even reaching several other Latinamerican countries, but some species have become naturalized around the world. One species, '' T. minuta'', is considered a noxious invasive plant in some areas. Description ''Tagetes'' species vary in size from 0.1 to 2.2 m tall. Most species have pinnate green leaves. Blooms naturally occur in golden, orange, yellow, and white colors, often with maroon highlights. Floral heads are typically (1-) to 4–6 cm ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Xeranthemum
''Xeranthemum'' is a genus of flowering plants in the family Asteraceae, native to Southern Europe. It has silvery flower heads with purplish tubular flowers. Species Species include: # ''Xeranthemum annuum ''Xeranthemum annuum'' is a flowering plant species also known as annual everlasting or immortelle. It is native to eastern Europe and western Asia, is cultivated as a garden flower. It has become naturalised Naturalization (or naturalisatio ...'' L. ("annual everlasting"): Central + southern Europe from Spain to Dagestan; Turkey, Caucasus # '' Xeranthemum cylindraceum'' Sm.: Central + southern Europe from Portugal to Ukraine; Turkey, Caucasus, Iran, Iraq, Syria, Jordan, Israel # '' Xeranthemum cylindricum'' Spreng. # '' Xeranthemum inapertum'' (L.) Mill.: southern Europe, North Africa, southwest Asia from Morocco to Turkmenistan # '' Xeranthemum longepapposum'' Fisch. & C.A.Mey.: southeastern Europe, southwestern and central Asia # '' Xeranthemum squarrosum'' Boiss. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Salvia
''Salvia'' () is the largest genus of plants in the sage family Lamiaceae, with nearly 1000 species of shrubs, herbaceous plant, herbaceous perennial plant, perennials, and annual plant, annuals. Within the Lamiaceae, ''Salvia'' is part of the tribe Mentheae within the subfamily Nepetoideae. One of several genera commonly referred to as sage, it includes two widely used herbs, ''Salvia officinalis'' (common sage, or just "sage") and ''Salvia rosmarinus'' (rosemary, formerly ''Rosmarinus officinalis''). The genus is distributed throughout the Old World and the Americas (over 900 total species), with three distinct regions of diversity: Central America and South America (approximately 600 species); Central Asia and the Mediterranean (250 species); Eastern Asia (90 species). Etymology The name ''Salvia'' derives from Latin (sage), from (safe, secure, healthy), an adjective related to (health, well-being, prosperity or salvation), and (to feel healthy, to heal). Pliny the Eld ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Globe Amaranth
''Gomphrena globosa'', commonly known as globe amaranth, is an edible plant from the family Amaranthaceae. The round-shaped flower inflorescences are a visually dominant feature and cultivars have been propagated to exhibit shades of magenta, purple, red, orange, white, pink, and lilac. Within the flowerheads, the true flowers are small and inconspicuous. ''Gomphrena globosa'' is native to Central America including regions Panama, and Guatemala, but is now grown globally. As a tropical annual plant, ''G. globosa'' blooms continuously throughout summer and early fall. It is very heat tolerant and fairly drought resistant, but grows best in full sun and regular moisture. The plant fixes carbon through the C4 pathway. At maturity, the flowerheads are approximately 4cm long and the plant grows up to 24 inches in height. ''Gomphrena globosa'' is an outcrossing species that is pollinated by butterflies, bees, and other insects. Floral volatiles likely play a significant role in the re ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Celosia
''Celosia'' ( ) is a small genus of edible and ornamental plants in the amaranth family, Amaranthaceae. The generic name is derived from the Ancient Greek word (), meaning "burning", and refers to the flame-like flower heads. Species are commonly known as woolflowers, or, if the flower heads are crested by fasciation, cockscombs. The plants are well known in East Africa's highlands and are used under their Swahili name, mfungu. Uses As a garden plant The plant is an annual. Seed production in these species can be very high, 200–700 kg per hectare. One ounce of seed may contain up to 43,000 seeds. One thousand seeds can weigh 1.0–1.2 grams. Depending upon the location and fertility of the soil, blossoms can last 8–10 weeks. '' C. argentea'' and '' C. cristata'' are common garden ornamental plants. As food ''Celosia argentea'' var. ''argentea'' or Lagos spinach (a.k.a. quail grass, soko, celosia, feather cockscomb) is a broadleaf annual leaf vegetable. It grows w ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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