Croptilon hookerianum

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

Croptilon hookerianum
Scientific classification
Kingdom:	Plantae
(unranked):	Angiosperms
(unranked):	Eudicots
(unranked):	Asterids
Order:	Asterales
Family:	Asteraceae
Tribe:	Astereae
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

1. The Plant List Croptilon hookerianum (Torr. & A.Gray) House
2. Biota of North America Program 2014 county distribution map
3. Flora of North America, Stiff-leaf scratchdaisy, Croptilon hookerianum (Torr. & A. Gray) House