Isocoma menziesii var. decumbens

(Greene) G. L. Nesom

Phytologia 70: 95. 1991.

Conservation concern
Basionym: Isocoma decumbens Greene Leafl. Bot. Observ. Crit. 1: 172. 1906
Synonyms: Haplopappus venetus subsp. furfuraceus (Greene) H. M. Hall Isocoma veneta var. furfuracea (Greene) R. M. Beauchamp
Treatment appears in FNA Volume 20. Treatment on page 442. Mentioned on page 443.

Stems prostrate to decumbent or ± erect; herbage finely and closely grayish-arachnoid-tomentose or glabrous, minutely stipitate-glandular. Leaf-blades narrowly oblanceolate, 5–22 × 2–4 mm, not thick-fleshy, margins entire or with 1–2 pairs of teeth distally. Heads in corymbiform to loose, paniculiform arrays. Corollas 5–6.5 mm. Cypselae 2.3–3.6 mm. 2n = 24.


Phenology: Flowering Jul–Nov.
Habitat: Sandy flats or slopes, commonly in disturbed sites
Elevation: 10–50(–200) m

Distribution

V20-1012-distribution-map.gif

Calif., Mexico (Baja California)

Discussion

Of conservation concern.

Variety decumbens grows in San Diego County and southward.

Selected References

None.

Lower Taxa

None.

"thick" is not a number.

not tailed +, rounded +  and obtuse +
distinct +
subequal +
scarious +
usually triangular +  and linear +
usually deltate +  and lanceolate +
paniculiform +, corymbiform +  and loose +
indeterminate +  and determinate +
Guy L. Nesom +
(Greene) G. L. Nesom +
decurrent +
Isocoma decumbens +
0.5 cm5 mm <br />0.005 m <br /> (4 cm40 mm <br />0.04 m <br />) +
obovate +  and spatulate or oblanceolate +
linear;oblanceolate or obovate +
rugulose +  and muricate +
not 2-lipped +  and actinomorphic +
0.5 cm5 mm <br />0.005 m <br /> (0.65 cm6.5 mm <br />0.0065 m <br />) +
subterete +, terete +  and obpyramidal +
fertile +  and bisexual +
fertile +  and bisexual +
Calif. +  and Mexico (Baja California) +
10–50(–200) m +
gland-dotted;gland-dotted +
sericeous +, tomentose +, glabrous +, villous +  and hispidulous +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Sandy flats or slopes, commonly in disturbed sites +
indeterminate +
heterogamous +  and homogamous +
not resinous +
stipitate-glandular +, glabrous +  and grayish-arachnoid-tomentose +
each +  and sessile +
0.6 cm6 mm <br />0.006 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
0.7 cm7 mm <br />0.007 m <br /> (0.9 cm9 mm <br />0.009 m <br />) +
obconic;turbinate or campanulate +
0.6 cm6 mm <br />0.006 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
0.5 cm5 mm <br />0.005 m <br /> (2.2 cm22 mm <br />0.022 m <br />) +
oblanceolate +
not thick-fleshy +
deltate +
with 1-2 pairs +  and entire +
toothed +  and lobed +
2-carpellate +
persistent +
Flowering Jul–Nov. +
oblong +  and elliptic-lanceolate +
styliferous +, neuter +  and pistillate +
bearing subulate enations +, hairy +  and bristly +
concave;usually flat;conic +
exalbuminous +
Conservation concern +
eglandular +  and few-branched +
resinous +
gland-dotted +
erect +  and decumbent +
stipitate-glandular +, tomentose +, villous +, hispidulous +  and glabrous +
appendaged +  and truncate +
papillate +  and smooth +
Haplopappus venetus subsp. furfuraceus +  and Isocoma veneta var. furfuracea +
Isocoma menziesii var. decumbens +
Isocoma menziesii +
variety +
goblet--shaped +
ampliate +
dark orange-resinous +
120 cm1,200 mm <br />1.2 m <br /> (150 cm1,500 mm <br />1.5 m <br />) +
20 cm200 mm <br />0.2 m <br /> (120 cm1,200 mm <br />1.2 m <br />) +
120 cm1,200 mm <br />1.2 m <br /> (150 cm1,500 mm <br />1.5 m <br />) +