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Croptilon hookerianum, called Hooker's scratchdaisy, is a North American species of flowering plants in the tribe Astereae within the family Asteraceae. It has been found in the US states of Texas, Oklahoma, Kansas, and Arkansas.[2]

Croptilon hookerianum
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Clade:	Angiosperms
Clade:	Eudicots
Clade:	Asterids
Order:	Asterales
Family:	Asteraceae
Genus:	Croptilon
Species:	C. hookerianum
Binomial name
Croptilon hookerianum (Torr. & A.Gray) House
Synonyms[1]
Synonymy Croptilon divaricatum var. hookerianum (Torr. & A.Gray) Shinners Haplopappus divaricatus var. hookerianus (Torr. & A.Gray) Waterf. Haplopappus validus subsp. torreyi E.B.Sm. Isopappus hookerianus Torr. & A.Gray Croptilon divaricatum var. graniticum (E.B.Sm.) Shinners, syn of var. graniticum Haplopappus validus subsp. graniticus E.B.Sm., syn of var. graniticum Haplopappus validus (Rydb.) Cory, syn of var. validum Isopappus validus Rydb., syn of var. validum

Croptilon hookerianum is an herb sometimes reaching a height of 120 cm (4 feet). Flower heads are yellow, with both ray florets and disc florets.[3]

Varieties

• Croptilon hookerianum var. graniticum (E.B.Sm.) E.B.Sm. - Texas
• Croptilon hookerianum var. hookerianum - Texas
• Croptilon hookerianum var. validum (Rydb.) E.B.Sm. - Arkansas, Kansas, Oklahoma, Texas

References

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