Capsicum terminology can be confusing. Pepper, chili, chile, chilli and capsicum are used interchangeably to describe the plants the pods the cooking of the genus Capsicum. I have chosen to use chilli throughout this site so I don't want any protesting from Southwest and Latin America where you would prefer 'chile,' or 'pepper' as would probably be used in the States.
Here is a quick guide to the naming. The genus is Capsicum from the Greek kapto, 'to bite' and then there are five species:
annuum, meaning "annual," which is an incorrect designation, include most of the common types like Nu Mex, JalapeƱo, Bels and Waxes.
baccatum, meaning "berrylike," which consist of the South American chillis known as ajĆs.
chinense, meaning "from China," which is also an incorrect designation, this species include the habanero's.
frutescens, meaning "shrubby or bushy," includes the Tabasco's .
pubescens, meaning "hairy," and includes the rocotos.
Capsicum annuum is the most extensively cultivated throughout the world and because it cross pollinates so easily there are probably thousands of varieties existing. Annuums are really divided into two categories: sweet (or mild) and hot. Too many leaf variations to describe but flower corollas are white with no spots. Popular annuums include:
Ancho, Anaheim
Big Bertha, Bolivian Rainbow,
Cayenne, Cherry Bomb, Cayenne, Cubanelle, ChimayĆ³, Chiltepin
Fresno, Fiesta, Firecracker
Goat Horn
Hungarian Yellow Wax
JalapeƱo, Jaloro
Nu Mex
Mulato, Mirasol
Peter Pepper, Peruvian Purple, Pasilla, Piemento. Poblano
Spur, Super Chili, Santa Fe Grande, Sweet Banana
Thai Hot
Capsicum Baccatum originated in Peru or Bolivia and are now found throughout South America. The plants are tall up to five foot with large dark green leaves. This species is distinguished from the other species by the flower corollas being white with distinctive dark green or brown spots, and anthers being yellow or tan. Fruity flavour being used in salsas or dried and ground into powders. Types include:
Capsicum chinense is often referred to as Habanero but there are hundreds of similar pod types. Originating from the Amazon into the Caribbean and then spreading into Central and South America. Growing from 1 to 5 feet high with pale to medium green large and wrinkled leaves. Flowers have white to greenish corollas and purple anthers and filaments. Slow growers with a long season. Most Countries have their own name for the chinense
Habanero
Congo Pepper
Goat pepper
Scotch Bonnet
AjĆ Limo
AjĆ dulce
Datil
Fatalii
Red Savina
Madame Jeanette
Naga Jolokia
Capsicum frutescens coming from the Amazon basin in Brazil and the Mexican city of Tabasco, hence the most recognizable one being the Tabasco. Now finding their way to India and the Far East where they are called bird pepper. Bushy type of plant growing to 4 feet, with smooth oval leaves up to 2.5 inches. Flowers have greenish white corollas with no spots and blue anthers, erect pods up to 1.5 inches long. Makes good pot plants.
Tabasco
African birdseye
Malagueta
Thai pepper
Demon Red
Capsicum pubescens originates in Bolivia, now being cultivated from the Andes to Mexico and Central America. The common name for this species is rocoto. Sprawling plant up to 4 feet high and two foot wide with oval light to dark green leaves being up to 3 inches long and very hairy. Flowers have purple corollas, purple anthers and stand erect above the leaves. Hardy plants with a long growing season. As the pods are so fleshy they are usually eaten fresh in salsas or stuffed but they are very hot.
Manzano Amerillo
Manzanoi Rojo
Rocoto