Layia

This article is about the genus of tidy tips. For the defunct legume genus, see Ormosia.

Layia is a genus of flowering plants in the family Asteraceae known generally as tidy tips, native to western North America. Several are California endemics.^[4][5]

Layia
Layia glandulosa
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Clade:	Angiosperms
Clade:	Eudicots
Clade:	Asterids
Order:	Asterales
Family:	Asteraceae
Subfamily:	Asteroideae
Tribe:	Madieae
Subtribe:	Madiinae
Genus:	Layia Hook. & Arn. ex DC. 1838, conserved name, not Hook. & Arn. 183 (syn of Ormosia in Fabaceae)[1][2]
Synonyms[3]
Callichroa Fisch. & C.A.Mey. Eriopappus Arn. Oxyura DC. Madaroglossa DC. Tollatia Endl. Calliachyris Torr. & A.Gray ex Torr. & A.Gray Calliglossa Hook. & Arn.

These are erect daisylike annual herbs with dark glandular stems. The flower heads usually contain white or yellow ray florets; some species have yellow florets tipped sharply in white which give the flowers their common name. The genus is named for naturalist George Tradescant Lay, who was one of the discoverers of Layia gaillardioides.^[6]

Species

Sources:^[3][7]

• Layia calliglossa - CA
• Layia carnosa - beach tidytips - CA
• Layia chrysanthemoides - smooth tidytips - CA
• Layia discoidea - rayless tidytips - CA
• Layia douglasii - OR WA
• Layia elegans - CA
• Layia erubescens - CA^[8]
• Layia fremontii - Frémont's tidytips - CA
• Layia gaillardioides - woodland tidytips - CA
• Layia glandulosa - white daisy tidytips - CA AZ NM NV UT ID OR WA, Baja California^[9]
• Layia heterotricha - pale yellow tidytips - CA
• Layia hieracioides - tall tidytips - CA
• Layia hispida - CA
• Layia jonesii - Jones' tidytips - CA
• Layia leucopappa - Comanche Point tidytips - CA
• Layia munzii - Munz' tidytips - CA
• Layia nemorosa - CA
• Layia pentachaeta - Sierra tidytips - CA
• Layia platyglossa - common tidytips - CA AZ UT
• Layia septentrionalis - Colusa tidytips - CA