Amaranthaceae

A typical pollen grain

                                                            
 
The family Amaranthaceae includes about 65 genera and 900 species of herbs and some shrubs. The plants of this family are reported as a common weed throughout United States apart widely cultivated plants like cockscomb, globe amaranths etc. Amaranths are rich green and the flowers are dense in spike like inflorescences.
FLOWERING
Flowering peaks in midsummer and autumn (from July to October). There is a wide range of flowering, however, that includes the spring months in southern latitudes and all year in southern Florida.
POLLEN MORPHOLOGY  
Pollen grains are spheroidal and pantoporate. The pore usually circular (may be 20-65 pore /grains) either globally distributed or in luminoid areas separated by muroid ridges.
AEROBIOLOGY AND ALLERGENICITY
The most important allergenic plants are the predominantly anemophilous like Amaranths, Pigweed, Water hemp etc. however a number of other plants of this family are entomophilous. The most common and frequent cause of pollinosis in the Amaranthaceae is Amaranths including Acnida. 

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