pteropogon vs Pteropogon humboltianum

pteropogon and Pteropogon humboltianum both are nouns.

Word	Noun	Adjective	Verb	Adverb
pteropogon	Yes	No	No	No
Pteropogon humboltianum	Yes	No	No	No

As nouns, pteropogon and Pteropogon humboltianum are synonyms defined as:

pteropogon and Pteropogon humboltianum: southern Australian plant having feathery hairs surrounding the fruit

pteropogon (noun)	Pteropogon humboltianum (noun)
southern Australian plant having feathery hairs surrounding the fruit	southern Australian plant having feathery hairs surrounding the fruit