Ambrosia bidentata

Michaux

Fl. Bor.-Amer. 2: 182. 1803.

Endemic
Treatment appears in FNA Volume 21. Treatment on page 15. Mentioned on page 11.

Annuals, 10–30 (–100+) cm. Stems erect. Leaves mostly opposite; petioles 0–0.5 mm; blades ± lanceolate to lance-linear, 15–40+ × 3–6 (–10+) mm, bases rounded to cordate, margins entire or with (1–) 2 (–4) basal lobes, abaxial and adaxial faces ± piloso-hispid and glanddotted. Pistillate heads clustered, proximal to staminates; florets 1. Staminate heads: peduncles 0–0.5 mm; involucres obliquely cupshaped (lateral lobe longer than others), 2.5–4 mm diam., piloso-hispid; florets 6–8+. Burs: bodies pyramidal, 5–8 mm, piloso-hispid, spines 4 (–5), ± distal, ± acerose, 0.5–1 mm, tips straight.


Phenology: Flowering Jul–Oct.
Habitat: Dry, disturbed sites
Elevation: 200–500 m

Distribution

V21-14-distribution-map.gif

Ala., Ark., Conn., D.C., Ga., Ill., Ind., Iowa, Kans., Ky., La., Md., Minn., Miss., Mo., N.C., Ohio, Okla., Tenn., Tex., Va., W.Va.

Discussion

Hybrids between Ambrosia bidentata and A. trifida have been recorded.

Selected References

None.

Lower Taxa

None.
... more about "Ambrosia bidentata"
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 +
Michaux +
rounded +  and cordate +
compound +  and simple +
0.6 cm6 mm <br />0.006 m <br /> (1 cm10 mm <br />0.01 m <br />) +
1.5 cm15 mm <br />0.015 m <br /> (4 cm40 mm <br />0.04 m <br />) +
less lanceolate;lance-linear +
3mm;6mm +
winged;ribbed;winged;ribbed +
piloso-hispid +
tuberculate +  and rugose +
pyramidal +
0.5 cm5 mm <br />0.005 m <br /> (0.8 cm8 mm <br />0.008 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 +
Ala. +, Ark. +, Conn. +, D.C. +, Ga. +, Ill. +, Ind. +, Iowa +, Kans. +, Ky. +, La. +, Md. +, Minn. +, Miss. +, Mo. +, N.C. +, Ohio +, Okla. +, Tenn. +, Tex. +, Va. +  and W.Va. +
200–500 m +
stipitate-glandular +, glabrate +  and hairy +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Dry, disturbed sites +
staminate +  and pistillate +
in corymbiform , glomerate , paniculiform , racemiform or spiciform , arrays +  and singly +
indeterminate +
homogamous +  and heterogamous +
each +  and sessile +
membranous +  and scarious +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
piloso-hispid +
cup-shaped +
conspicuous +
petiolate +  and sessile +
incurved;erect +
deltate +
with (1-)2(-4) basal lobes +  and entire +
connate +  and distinct +
2-carpellate +
stipitate-glandular +, hirtellous +  and villous +
spatulate;linear +
membranous +
persistent +
0 cm0 mm <br />0 m <br /> (0.05 cm0.5 mm <br />5.0e-4 m <br />) +
0 cm0 mm <br />0 m <br /> (0.05 cm0.5 mm <br />5.0e-4 m <br />) +
Flowering Jul–Oct. +
5 +  and 16 +
unequal +  and subequal +
Fl. Bor.-Amer. +
bearing subulate enations +, hairy +  and bristly +
convex;flat +
exalbuminous +
acerose +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
prostrate +  and decumbent +
appendaged +  and truncate +
hirsutulous +  and glabrous +
papillate +
Franseria +  and Hymenoclea +
Ambrosia bidentata +
Ambrosia +
species +
campanulate +  and cylindric +
straight +
toothed +  and entire +
30 cm300 mm <br />0.3 m <br /> (100 cm1,000 mm <br />1 m <br />) +
10 cm100 mm <br />0.1 m <br /> (30 cm300 mm <br />0.3 m <br />) +