Phacelia whitlavia vs phacelia

Phacelia whitlavia and phacelia both are nouns.

Word	Noun	Adjective	Verb	Adverb
Phacelia whitlavia	Yes	No	No	No
phacelia	Yes	No	No	No

As nouns, phacelia is a hypernym of Phacelia whitlavia; that is, phacelia is a word with a broader meaning than Phacelia whitlavia:

Phacelia whitlavia: desert plant of southern California with blue or violet tubular flowers in terminal racemes
phacelia: any plant of the genus Phacelia

Other hypernyms of Phacelia whitlavia include scorpion weed, scorpionweed.

Phacelia whitlavia (noun)	phacelia (noun)
desert plant of southern California with blue or violet tubular flowers in terminal racemes	any plant of the genus Phacelia