Layia gaillardioides

(Hooker & Arnott) de Candolle in A. P. de Candolle and A. L. P. P. de Candolle

in A. P. de Candolle and A. L. P. P. de Candolle, Prodr. 7: 294. 1838.

Endemic
Basionym: Tridax gaillardioides Hooker & Arnott Bot. Beechey Voy., 148. 1833 (as galardioides)
Treatment appears in FNA Volume 21. Treatment on page 268. Mentioned on page 263, 264.

Plants 6–60 cm (self-incompatible); not glandular, often strongly scented. Stems purple-streaked. Leaf-blades oblanceolate or lanceolate to linear, 5–120 mm, margins (basal leaves) toothed to pinnatifid. Involucres subglobose to ± campanulate or hemispheric, 4–9+ × 4–12+ mm. Phyllaries 6–18, apices shorter than folded bases. Paleae in 1 series between ray and disc-florets. Ray-florets 6–18; laminae yellow or bicolored (proximally yellow, distally whitish or pale-yellow), 3.5–18 mm. Disc-florets 14–100+; corollas 3–5 mm; anthers ± dark purple. Ray cypselae glabrous. Disc pappi 0 or of 15–24 white to rufous or purplish, ± equal bristles or setiform scales 1–4 mm, each proximally plumose, not adaxially woolly. 2n = 16.


Phenology: Flowering Mar–Aug.
Habitat: Open or semishady sites in woodlands, grasslands, meadows, chaparral, or forests, often on serpentine or sandy soils
Elevation: 0–1300 m

Discussion

Layia gaillardioides occurs on the North Coast and in the North Coast Ranges, San Francisco Bay area, and Inner South Coast Ranges, and in the Outer South Coast Ranges (near Cayucos). As treated here (provisionally) and previously, L. gaillardioides is not monophyletic; molecular phylogenetic data have indicated that some lineages of L. gaillardioides are more closely related to L. carnosa, L. hieracioides, and/or L. septentrionalis than to one another (B. G. Baldwin, unpubl.).

Selected References

None.

Lower Taxa

None.
... more about "Layia gaillardioides"
not tailed +, rounded +  and obtuse +
dark purple +
pale +  and dark +
connate +  and distinct +
subequal +
scarious +
usually ovate +  and lanceolate +
usually deltate +  and lanceolate +
umbelliform +, spiciform +, paniculiform +, glomerulate +  and corymbiform +
indeterminate +  and determinate +
Bruce G. Baldwin +, Susan J. Bainbridge +  and John L. Strother +
(Hooker & Arnott) de Candolle in A. P. de Candolle and A. L. P. P. de Candolle +
decurrent +
Tridax gaillardioides +
0.5 cm5 mm <br />0.005 m <br /> (12 cm120 mm <br />0.12 m <br />) +
lanceolate +  and linear +
compound +  and simple +
linear to linear-elliptic +
1-2-pinnatifid;oblanceolate;linear +
winged;ribbed;winged;ribbed +
tuberculate +  and rugose +
barbellulate +  and barbellate +
0.1 cm1 mm <br />0.001 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
yellow +, bicolored +, white +  and cream +
0.3 cm3 mm <br />0.003 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
hairy +  and glabrous +
fusiform +, clavate +, obpyramidal +, terete +, compressed +  and obcompressed +
fertile +  and bisexual +
fertile +  and bisexual +
0–1300 m +
hirsute +  and strigose +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Open or semishady sites in woodlands, grasslands, meadows, chaparral, or forests, often on serpentine or sandy soils +
in more or less corymbiform arrays +  and singly +
indeterminate +
homogamous +  and heterogamous +
each +  and sessile +
0.2 cm2 mm <br />0.002 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
0.4 cm4 mm <br />0.004 m <br /> (0.9 cm9 mm <br />0.009 m <br />) +
subglobose;more or less campanulate or hemispheric +
0.4 cm4 mm <br />0.004 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
bicolored +  and yellow +
0.35 cm3.5 mm <br />0.0035 m <br /> (1.8 cm18 mm <br />0.018 m <br />) +
petiolate +  and sessile +
alternate +  and opposite +
deltate +
dentate to pinnatifid or palmatifid +  and entire +
toothed +  and pinnatifid +
2-carpellate +
persistent +
of 1 +  and 32 elliptic +
subulate +, setiform +, ovate +  and lance-attenuate +
Flowering Mar–Aug. +
6 +  and 18 +
alternate +  and opposite +
in A. P. de Candolle and A. L. P. P. de Candolle, Prodr. +
clavate +  and obcompressed +
flat;convex +
plumose +  and setiform +
0.1 cm1 mm <br />0.001 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
exalbuminous +
purple-streaked +
appendaged +  and truncate +
hirsutulous +  and glabrous +
papillate +
Compositae +
Layia gaillardioides +
species +
cylindric +
entire +  and toothed +
60 cm600 mm <br />0.6 m <br /> (130 cm1,300 mm <br />1.3 m <br />) +
2 cm20 mm <br />0.02 m <br /> (60 cm600 mm <br />0.6 m <br />) +
0.5 cm5 mm <br />0.005 m <br /> (1 cm10 mm <br />0.01 m <br />) +