Ambrosia pumila

(Nuttall) A. Gray

Proc. Amer. Acad. Arts 17: 217. 1882.

Basionym: Franseria pumila Nuttall Trans. Amer. Philos. Soc., n. s. 7: 344. 1840
Treatment appears in FNA Volume 21. Treatment on page 18. Mentioned on page 12.

Perennials, 10–20 (–40+) cm. Stems erect. Leaves mostly alternate (sometimes crowded at bases of stems); petioles 5–35 (–55) mm; blades deltate to elliptic, 15–35 (–75) × 12–25 (–45) mm overall, laciniately (1–) 2 (–3) -pinnately lobed, bases cuneate to truncate, ultimate margins entire, abaxial and adaxial faces ± strigillose to sericeous (often grayish) and glanddotted. Pistillate heads clustered, proximal to staminates; florets 1. Staminate heads: peduncles 0.5–6 mm; involucres obliquely cupshaped, 3–5 mm diam., ± strigillose; florets 8–25+. Burs: bodies ± fusiform, 2–2.5 mm, strigillose, spines or tubercles 0 or 1–5, mostly distal, stoutly conic, 0.1–0.5 mm, tips straight. 2n = 72.


Phenology: Flowering May–Jun(–Oct).
Habitat: Disturbed sites, damp to wet, alkaline soils
Elevation: 100–200 m

Distribution

V21-24-distribution-map.gif

Calif., Mexico (Baja California)

Discussion

Selected References

None.

Lower Taxa

None.
... more about "Ambrosia pumila"
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 +
(Nuttall) A. Gray +
cuneate +  and truncate +
Franseria pumila +
compound +  and simple +
3.5 cm35 mm <br />0.035 m <br /> (7.5 cm75 mm <br />0.075 m <br />) +
2.5 cm25 mm <br />0.025 m <br /> (4.5 cm45 mm <br />0.045 m <br />) +
1.5 cm15 mm <br />0.015 m <br /> (3.5 cm35 mm <br />0.035 m <br />) +
lobed;deltate;elliptic +
12mm;25mm +
winged;ribbed;winged;ribbed +
strigillose +
tuberculate +  and rugose +
fusiform +
0.2 cm2 mm <br />0.002 m <br /> (0.25 cm2.5 mm <br />0.0025 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 +
Calif. +  and Mexico (Baja California) +
100–200 m +
stipitate-glandular +, glabrate +  and hairy +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Disturbed sites, damp to wet, alkaline soils +
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 /> (0.5 cm5 mm <br />0.005 m <br />) +
cup-shaped +
conspicuous +
petiolate +  and sessile +
incurved;erect +
deltate +
dentate to pinnatifid or palmatifid +  and entire +
connate +  and distinct +
2-carpellate +
stipitate-glandular +, hirtellous +  and villous +
spatulate;linear +
membranous +
persistent +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
3.5 cm35 mm <br />0.035 m <br /> (5.5 cm55 mm <br />0.055 m <br />) +
0.5 cm5 mm <br />0.005 m <br /> (3.5 cm35 mm <br />0.035 m <br />) +
Flowering May–Jun(–Oct). +
5 +  and 16 +
unequal +  and subequal +
Proc. Amer. Acad. Arts +
bearing subulate enations +, hairy +  and bristly +
convex;flat +
exalbuminous +
0.01 cm0.1 mm <br />1.0e-4 m <br /> (0.05 cm0.5 mm <br />5.0e-4 m <br />) +
prostrate +  and decumbent +
appendaged +  and truncate +
hirsutulous +  and glabrous +
papillate +
Franseria +  and Hymenoclea +
Ambrosia pumila +
Ambrosia +
species +
campanulate +  and cylindric +
straight +
0.01 cm0.1 mm <br />1.0e-4 m <br /> (0.05 cm0.5 mm <br />5.0e-4 m <br />) +
toothed +  and entire +
20 cm200 mm <br />0.2 m <br /> (40 cm400 mm <br />0.4 m <br />) +
10 cm100 mm <br />0.1 m <br /> (20 cm200 mm <br />0.2 m <br />) +