Calendula is a herbaceous perennial flower that grows once every year. The bloom time for calendula occurs in May through early Fall. This flower is known for its  bright yellow and orange colors. There are several different types of calendula, there is: Dwarf Gem, Fruit Twist, Sherbet Fizz, Citrus Cocktail, Bronzed Beauty, Radio Extra, Pink Surprise, Touch of Red, Neon, Greenheart Orange, and Tangerine Cream.

Dwarf Gem Calendula are some of the most popular garden flowers. It is known for its short compact assortment, bright orange color and round shape. Fruit Twist calendula is a range of single, double and semi-double its petals are a yellow-orange color. Sherbet Fizz calendula is a light brownish yellow color with a red shade underneath the  petals. Citrus Cocktail Calendula is on the smaller side with bright yellow and orange flowers.   Bronzed Beauty calendula looks similar to Sherbet Fizz calendula only it has more peachy tones. Radio Extra calendula is a yellow and orange flower, it has tall stems with lance-to-ovate shaped petals and leaves. Pink Surprise calendula is a compact sunset looking flower because of its petals  yellow and orange body and pink tips. Touch of Red Calendula is a light orange flower with red tips. Neon calendula is a doubled petal flower with bright orange petals and dark red tips. Greenheart Orange calendula’s petals are orange with a green stamen. Finally Tangerine Cream calendula is a double petaled flower with a mix of bright and pale orange colors. 

As you can see there is a variety of unique calendula flowers. 

Calendula's Asteraceae family stems from  marigolds, daisies and chrysanthemums which all share similar appearances. Southwestern Asia, western Europe, Macaronesia, and the Mediterranean are the native lands of Calendula. This miracle flower has been used in traditional practices all around the world. Calendula Petals are used to treat acne, wounds, rashes, infections and inflammation because of its antiseptic, antibacterial, anti-inflammatory, and antifungal properties. Calendula is used in skin care and hair care products; it is also used to make tea. 

References:

https://www.thespruce.com/growing-and-using-calendula-1402626

https://www.webmd.com/vitamins/ai/ingredientmono-235/calendula

https://frantsila.com/en/calendula-officinalis-worth-its-weight-in-gold/