Malacothrix similis

W. S. Davis & P. H. Raven

Madroño 16: 262, fig. 2c. 1962.

Conservation concern
Treatment appears in FNA Volume 19. Treatment on page 320. Mentioned on page 311, 312.

Annuals, 5–30+ cm. Stems 1–11, erect or ascending, branched mostly proximally, glabrous or sparsely arachnose to puberulent and glabrescent. Cauline leaves: proximal mostly lance-linear, sometimes pinnately lobed, not fleshy, ultimate margins dentate or entire, faces glabrous or sparsely arachnose to puberulent and glabrescent; distal reduced subentire. Calyculi of 8–12+ lance-deltate to lanceolate bractlets, hyaline margins 0.05–0.3 mm wide. Involucres narrowly campanulate, 6–10 × 3–6 mm. Phyllaries 18–21+ in ± 2 series, lance-linear to linear, ± equal, hyaline margins 0.05–0.2 mm wide, faces glabrous. Receptacles not bristly. Florets 32–73: corollas yellow, 4–9 mm; outer ligules exserted 2–4 mm. Cypselae ± cylindro-fusiform to prismatic, 1.4–1.7 mm, ribs extending to apices, 5 more prominent than others; pappi persistent, of ca. 18, irregular needlelike teeth plus 1 bristle. Pollen mostly 4-porate (mean diam. 30 µm). 2n = 28.


Phenology: Flowering Apr–May.
Habitat: Coastal plains, beaches, dunes
Elevation: 0–40 m

Distribution

V19-485-distribution-map.gif

Calif., Mexico (Baja California)

Discussion

Of conservation concern.

Malacothrix similis has been collected on Santa Cruz Island (in 1888) and at Hueneme Beach (in 1925).

Selected References

None.

Lower Taxa

None.

"fine" is not a number."]" is not declared as a valid unit of measurement for this property.

... more about "Malacothrix similis"
obtuse;acute or acuminate +
scarious +
ovate +  and lanceolate +
corymbiform +  and paniculiform +
indeterminate +  and determinate +
W. S. Davis +
W. S. Davis & P. H. Raven +
decurrent +
compound +  and simple +
lanceolate;obovate oblanceolate or spatulate +
tuberculate +, rugose +, muricate +  and smooth +
lance-deltate;lanceolate +
subequal +  and unequal +
filiform +
zygomorphic +, actinomorphic +  and (3-)5-merous +
0.4 cm4 mm <br />0.004 m <br /> (0.9 cm9 mm <br />0.009 m <br />) +
crenate +
stramineous +  and brown or purplish brown +
less cylindro-fusiform +  and prismatic +
Calif. +  and Mexico (Baja California) +
0–40 m +
glabrous +, glabrescent +, sparsely arachnose +  and puberulent +
winged +  and beaked +
dispersed +
Coastal plains, beaches, dunes +
indeterminate +
each +  and sessile +
0.6 cm6 mm <br />0.006 m <br /> (1 cm10 mm <br />0.01 m <br />) +
campanulate +
0.3 cm3 mm <br />0.003 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
cauline +  and basal +
divided +, lobed +  and dentate +
0.05mm +  and 0.2mm +
0.2 cm2 mm <br />0.002 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
2-carpellate +
persistent +
Flowering Apr–May. +
lance-linear +  and linear +
connate +  and distinct +
18 +  and 21 +
subequal +  and unequal +
flat;more or less convex +
more prominent +
crenate +
exalbuminous +
Conservation concern +
ascending +  and erect +
glabrescent +, sparsely arachnose +  and puberulent +
1 +  and 11 +
appendaged +  and truncate +
papillate +
Undefined tribe Lactuceae +
Malacothrix similis +
Malacothrix +
species +
70 cm700 mm <br />0.7 m <br /> (200 cm2,000 mm <br />2 m <br />) +
5 cm50 mm <br />0.05 m <br /> (30 cm300 mm <br />0.3 m <br />) +
shrub +  and subshrub +