''Gomphrena globosa'', commonly known as globe amaranth, is an edible plant from the family
Amaranthaceae
Amaranthaceae is a family of flowering plants commonly known as the amaranth family, in reference to its type genus ''Amaranthus''. It includes the former goosefoot family Chenopodiaceae and contains about 165 genera and 2,040 species, making it ...
. The round-shaped flower
inflorescence
An inflorescence is a group or cluster of flowers arranged on a stem that is composed of a main branch or a complicated arrangement of branches. Morphologically, it is the modified part of the shoot of seed plants where flowers are formed o ...
s 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 reproductive success of the plant by promoting the attraction of pollinators.
Uses
In
Hawaii
Hawaii ( ; haw, Hawaii or ) is a state in the Western United States, located in the Pacific Ocean about from the U.S. mainland. It is the only U.S. state outside North America, the only state that is an archipelago, and the only stat ...
, it is commonly used in long-lasting
leis since it retains its shape and color after drying.
In
Nepal
Nepal (; ne, नेपाल ), formerly the Federal Democratic Republic of Nepal ( ne,
सङ्घीय लोकतान्त्रिक गणतन्त्र नेपाल ), is a landlocked country in South Asia. It is mai ...
, the flower is known commonly as m''akhamali ful'' and is used to make a garland during
Bhai Tika
Bhai Dooj, Bhaubeej, Bhai Tika, Bhai Phonta or Bhratri Dwitiya is a festival celebrated by Hindus on the second lunar day of the Shukla Paksha (bright fortnight) of Kartika, the eighth month of the Vikram Samvat Hindu calendar or the Shalivahana ...
, last day of
Tihar festival. The garland is put around the brother's neck by their sister for protection. The slow withering character of the flower symbolizes a long life for the brother. The flower is said to be introduced in Nepal around 18th century. The flower was included in the gift sent to
Britain by
Jung Bahadur Rana in 1855. This flower is known as ''Rakta Mallika'' in
Sanskrit
Sanskrit (; attributively , ; nominally , , ) is a classical language belonging to the Indo-Aryan branch of the Indo-European languages. It arose in South Asia after its predecessor languages had diffused there from the northwest in the late ...
.
This plant is common in landscape design and cutting gardens for its vivid colors and color retention.
The edible plant ''G. globosa'' has been used in
herbal medicine
Herbal medicine (also herbalism) is the study of pharmacognosy and the use of medicinal plants, which are a basis of traditional medicine. With worldwide research into pharmacology, some herbal medicines have been translated into modern remed ...
.
The flowers of ''G. globosa'' are rich in
betacyanins which have a wide range of applications as additives and supplements in the food industry, cosmetics, and livestock feed. Stable between pH 3 and 7, the betacyanins in globe amaranth are well suited to be used as natural food dye and have a red-violet color.
Chemical properties
Phytochemicals
At least twenty-seven
phytochemical
Phytochemicals are chemical compounds produced by plants, generally to help them resist fungi, bacteria and plant virus infections, and also consumption by insects and other animals. The name comes . Some phytochemicals have been used as poisons ...
s have been detected in ''G. globosa'' including six phenolic acid derivatives and fifteen specific flavonoids. The most abundant phenolic compounds present are
flavonoid
Flavonoids (or bioflavonoids; from the Latin word ''flavus'', meaning yellow, their color in nature) are a class of polyphenolic secondary metabolites found in plants, and thus commonly consumed in the diets of humans.
Chemically, flavonoids ...
s. A major phenol was found to be kaempferol 3-O-rutinoside based on chromatographic and mass spectrometry techniques.
Gomphrenol derivatives also contribute to phenolic content. Other flavanols include quercetin, kaempferol, and isorhamnetin derivatives.
Betacyanins
The major betacyanins identified in globe amaranth are gomphrenin, isogomphrenin II, and isogomphrenin III.
These compounds are stored in vacuoles in the plant.
Volatiles
Cultivars of ''G. globosa'' vary in the identity of floral volatiles but the volatile compounds of nonanal, decanal, geranyl acetone, and 4,8,12-tetradecatrienal, 5,9,13-trimethyl, were commonly detected by chromatography-mass spectrometry analysis. The cultivar ‘Fireworks’ has a high abundance of volatile esters such as geranyl propionate, geranyl isovalerate, benzyl isovalerate, and benzyl tiglate. The floral volatile emission of this cultivar of ''G. globosa'' was found to exhibit a diurnal pattern independent of light. Emission of floral volatiles can be regulated by phytohormone and defense signaling molecules. Experimentally, the ethylene inhibitor silver thiosulphate increased volatile emission of molecules derived from the terpenoid pathway. Defense signaling molecules can have temporal effects on floral volatile emission such as increased emission after four hours and reduced emission of volatiles after 24 hours in time studies analyzed with chromatography-mass spectrometry.
Gallery
File:Hongkong Gomphrena.JPG
File:2010. Выставка цветов в Донецке на день города 32.jpg
File:Gomphrena globosa - 1199885271.jpg
File:Gomphrena ‘Pink Zazzle™,’ Phipps Conservatory Outdoor Garden, 2015-10-01, 01.jpg
File:Http Rudrashki flower.jpg, Flowerhead of ''G. globosa''
References
{{Taxonbar, from=Q1200680
globosa
Flora of Brazil
Flora of Panama
Flora of Guatemala
Flora of the Cerrado
Plants described in 1753
Taxa named by Carl Linnaeus
Medicinal plants of South America
Garden plants of South America
Flora of Nepal