Layia platyglossa

(Fischer & C. A. Meyer) A. Gray

Mem. Amer. Acad. Arts, n. s. 4: 103. 1849.

Common names: Tidy tips
Basionym: Callichroa platyglossa Fischer & C. A. Meyer Index Seminum (St. Petersburg) 2: 31. 1836
Synonyms: Layia platyglossa subsp. campestris D. D. Keck Layia ziegleri Munz
Treatment appears in FNA Volume 21. Treatment on page 265. Mentioned on page 263, 264, 266.

Plants 3–70 cm (self-incompatible); glandular, not strongly scented. Stems usually not purple-streaked. Leaf blades lanceolate or oblanceolate to linear, 4–100(–120) mm, margins (basal leaves) toothed to pinnatifid. Involucres hemispheric, 4–18 × 4–15+ mm. Phyllaries 5–18, apices often longer (sometimes shorter) than folded bases. Paleae in 1 series between ray and disc florets. Ray florets 5–18; laminae yellow or proximally yellow and distally white, 3–21 mm. Disc florets 6–120+; corollas 3.5–6 mm; anthers ± dark purple (in southwest of range, sometimes yellow or brownish). Ray cypselae glabrous or sparsely hairy. Disc pappi 0 or of 14–32 white to tawny, ± equal bristles or setiform scales 2–5 mm, each ± scabrous, usually not plumose and not adaxially woolly (in southwest of range, often proximally plumose and adaxially woolly). 2n = 14.

Phenology: Flowering Feb–Jul.
Habitat: Open, often grassy slopes or flats, disturbed sites, often on sandy or clayey soil, sometimes serpentine
Elevation: 0–2000 m



Calif., Mexico (Baja California).


Layia platyglossa occurs from the North Coast Ranges through central-western and southwestern California and west to the immediate coast and east into the central Great Valley. A specimen reported by S. L. Welsh et al. (1993) from dunes in Utah (Harrison 2545, BRY) may be mislabeled.

Selected References


Lower Taxa

... more about "Layia platyglossa"
Bruce G. Baldwin +, Susan J. Bainbridge +  and John L. Strother +
(Fischer & C. A. Meyer) A. Gray +
Callichroa platyglossa +
Tidy tips +
Calif. +  and Mexico (Baja California). +
0–2000 m +
Open, often grassy slopes or flats, disturbed sites, often on sandy or clayey soil, sometimes serpentine +
Flowering Feb–Jul. +
Mem. Amer. Acad. Arts, n. s. +
Illustrated +
Layia platyglossa subsp. campestris +  and Layia ziegleri +
Layia platyglossa +
species +