Ambrosia cheiranthifolia

A. Gray in W. H. Emory

in W. H. Emory, Rep. U.S. Mex. Bound. 2(1): 87. 1859.

Treatment appears in FNA Volume 21. Treatment on page 17. Mentioned on page 11.

Perennials or subshrubs, 10–30+ cm (rhizomatous and/or soboliferous, colonial). Stems erect. Leaves opposite (distal sometimes alternate); petioles 0; blades lanceolate or lance-elliptic to lance-oblong or oblanceolate, 20–50 (–70+) × 8–12 (–25+) mm, rarely ± pinnately lobed (lobes ± deltate), bases cuneate (then rounded), margins entire or toothed, abaxial faces densely strigose (silvery gray), adaxial faces strigillose. Pistillate heads clustered (in axils), proximal to staminates; florets 1 (–2). Staminate heads: peduncles 1–4+ mm; involucres cupshaped (sometimes with black nerve in each lobe), 3–4+ mm diam., strigillose; florets 8–18+. Burs: bodies ± pyriform to ± globose, 2–3+ mm, glabrous or strigose, spines (1–) 3–5+, scattered, stoutly conic, 0.4–0.8+ mm, tips straight (often each with black nerve). 2n = 72.


Phenology: Flowering Jun–Nov.
Habitat: Seasonally wet clays or sands, scrublands
Elevation: 10–30+ m

Discussion

Selected References

None.

Lower Taxa

None.
... more about "Ambrosia cheiranthifolia"
not tailed +, rounded +  and obtuse +
coherent +  and distinct +
connate +  and distinct +
subequal +
scarious +
usually ovate +  and lanceolate +
usually deltate +  and lanceolate +
spiciform +, racemiform +, paniculiform +, glomerate +  and corymbiform +
indeterminate +  and determinate +
John L. Strother +
A. Gray in W. H. Emory +
cuneate +
compound +  and simple +
5 cm50 mm <br />0.05 m <br /> (7 cm70 mm <br />0.07 m <br />) +
1.2 cm12 mm <br />0.012 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
2 cm20 mm <br />0.02 m <br /> (5 cm50 mm <br />0.05 m <br />) +
lobed;lance-elliptic;lance-oblong or oblanceolate +
8mm;12mm +
winged;ribbed;winged;ribbed +
strigose +  and glabrous +
tuberculate +  and rugose +
less pyriform;more or less globose +
0.2 cm2 mm <br />0.002 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
barbellulate +  and barbellate +
purplish +  and whitish +
villous +, strigillose +, hispidulous +, glabrous +  and warty +
tuberculate +
globose +  and obovoid pyramidal pyriform obconic or fusiform +
fertile +  and bisexual +
Tex. +  and Mexico (Tamaulipas) +
10–30+ m +
stipitate-glandular +, glabrate +  and hairy +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Seasonally wet clays or sands, scrublands +
staminate +  and pistillate +
in corymbiform , glomerate , paniculiform , racemiform or spiciform , arrays +  and singly +
indeterminate +
homogamous +  and heterogamous +
each +  and sessile +
membranous +  and scarious +
0.3 cm3 mm <br />0.003 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
cup-shaped +
conspicuous +
petiolate +  and sessile +
incurved;erect +
deltate +
dentate to pinnatifid or palmatifid +  and entire +
toothed +  and entire +
connate +  and distinct +
2-carpellate +
stipitate-glandular +, hirtellous +  and villous +
spatulate;linear +
membranous +
persistent +
0.1 cm1 mm <br />0.001 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
Flowering Jun–Nov. +
5 +  and 16 +
unequal +  and subequal +
in W. H. Emory, Rep. U.S. Mex. Bound. +
bearing subulate enations +, hairy +  and bristly +
convex;flat +
exalbuminous +
3 (?) +  and 5 (?) +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (0.08 cm0.8 mm <br />8.0e-4 m <br />) +
prostrate +  and decumbent +
appendaged +  and truncate +
hirsutulous +  and glabrous +
papillate +
Franseria +  and Hymenoclea +
Ambrosia cheiranthifolia +
Ambrosia +
species +
campanulate +  and cylindric +
straight +
toothed +  and entire +
10 cm100 mm <br />0.1 m <br /> (30 cm300 mm <br />0.3 m <br />) +