Chaenactis fremontii

A. Gray

Proc. Amer. Acad. Arts 19: 30. 1883.

Common names: Fremont or desert pincushion pincushion flower
Treatment appears in FNA Volume 21. Treatment on page 414. Mentioned on page 409, 411.

Plants 10–30 (–40) cm; proximal indument glabrescent (early ± arachnoid, glabrous by flowering). Stems mostly 1–12; branches mainly proximal. Leaves basal (withering) and ± cauline, 1–7 (–10) cm; largest blades linear and terete or ± elliptic and plane, ± succulent, 0–1-pinnately lobed; lobes 1–2 (–5) pairs, remote, ± terete. Heads (± radiant) mostly 1–5 per stem. Peduncles 2–8 (–10) cm, distally usually ± stipitate-glandular and, sometimes, ± arachnoid (at least early, often glabrescent by fruit). Involucres ± hemispheric to obconic (bases pale and ± truncate in fruit). Phyllaries: longest 8–10 (–12) mm; outer usually glabrescent in fruit, apices erect, acute, ± rigid. Florets: corollas white to pinkish, 5–8 mm (inner); peripheral corollas spreading, zygomorphic, enlarged. Cypselae (3–) 6–8 mm; pappi of (1–) 4 (–5) scales in 1 series, longest scales 6–8.5 mm, lengths 1–1.3 times corollas (apices visible among corollas at flowering). 2n = 10.


Phenology: Flowering Mar–May.
Habitat: Sandy or gravelly soils, warm deserts, often growing through shrubs
Elevation: -10–1600 m

Distribution

V21-1038-distribution-map.gif

Ariz., Calif., Nev., Utah, Mexico (Baja California)

Discussion

Chaenactis fremontii is often the most abundant spring wildflower in the lower Mojave and northern Sonoran deserts, where it is reported to be a significant food source for desert tortoises (Gopherus agassizii Cooper). It also extends seaward into the southern San Joaquin Valley area of west-central California, often as hybrids with other taxa (see sectional discussion).

The involucre bases described above are characteristic of Chaenactis fremontii and can help separate it from some forms of C. stevioides.

Selected References

None.

Lower Taxa

None.

"-1.3timescorollas" is not declared as a valid unit of measurement for this property."longest" is not a number.

... more about "Chaenactis fremontii"
not tailed +, rounded +  and obtuse +
connate +  and distinct +
subequal +
usually ovate +  and lanceolate +
usually deltate +  and lanceolate +
paniculiform +, cymiform +  and corymbiform +
indeterminate +  and determinate +
James D. Morefield +
A. Gray +
decurrent +
compound +  and simple +
lobed;ovate;oblanceolate;ovate;oblanceolate;linear;deltate +
winged;ribbed;winged;ribbed +
tuberculate +  and rugose +
barbellulate +  and barbellate +
connate +  and distinct +
Fremont or desert pincushion +  and pincushion flower +
actinomorphic +
white +  and pinkish +
stipitate-glandular +  and hairy +
0.5 cm5 mm <br />0.005 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
0.3 cm3 mm <br />0.003 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
fertile +  and bisexual +
fertile +  and bisexual +
Ariz. +, Calif. +, Nev. +, Utah +  and Mexico (Baja California) +
-10–1600 m +
strigose +  and densely sericeous +
scabrellous +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
campanulate +  and cylindric +
Sandy or gravelly soils, warm deserts, often growing through shrubs +
indeterminate +
homogamous +  and heterogamous +
each +  and sessile +
0.5 cm5 mm <br />0.005 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
less hemispheric;obconic +
lobed +, plane +, elliptic +  and terete +
7 cm70 mm <br />0.07 m <br /> (10 cm100 mm <br />0.1 m <br />) +
cauline +  and basal +
1 cm10 mm <br />0.01 m <br /> (?) +  and 7 cm70 mm <br />0.07 m <br /> (?) +
0.6 cm6 mm <br />0.006 m <br /> (0.85 cm8.5 mm <br />0.0085 m <br />) +
dentate to pinnatifid or palmatifid +  and entire +
acute +  and blunt +
2-carpellate +
persistent +
coroniform +
8 cm80 mm <br />0.08 m <br /> (10 cm100 mm <br />0.1 m <br />) +
arachnoid +  and stipitate-glandular +
2 cm20 mm <br />0.02 m <br /> (8 cm80 mm <br />0.08 m <br />) +
Flowering Mar–May. +
1 cm10 mm <br />0.01 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
5 +  and 21 +
0.8 cm8 mm <br />0.008 m <br /> (1 cm10 mm <br />0.01 m <br />) +
Proc. Amer. Acad. Arts +
bearing subulate enations +, hairy +  and bristly +
knobby;convex;more or less flat +
distinct +
exalbuminous +
unequal;unequal +
5 (?) +  and 12 (?) +
usually erect +  and ascending +
1 +  and 12 +
appendaged +  and truncate +
hirsutulous +  and glabrous +
papillate +
Undefined (tribe Undefined) subtribe Bahiinae +  and Undefined (tribe Undefined) subtribe Palafoxiinae +
Chaenactis fremontii +
Chaenactis sect. Chaenactis +
species +
cylindric +
80 cm800 mm <br />0.8 m <br /> (300 cm3,000 mm <br />3 m <br />) +
1 cm10 mm <br />0.01 m <br /> (80 cm800 mm <br />0.8 m <br />) +
toothed +  and entire +
70 cm700 mm <br />0.7 m <br /> (200 cm2,000 mm <br />2 m <br />) +
5 cm50 mm <br />0.05 m <br /> (70 cm700 mm <br />0.7 m <br />) +