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Red de Herbarios del Noroeste de México (northern Mexico)
SERNEC - Southeastern USA
Ambrosia pumila
A.Gray
(redirected from:
Franseria pumila
Nutt.)
Family:
Asteraceae
Dwarf Burr-Ragweed,
more...
San Diego ambrosia
[
Franseria pumila
Nutt.]
Images
not available
FNA
Resources
John L. Strother in Flora of North America (vol. 21)
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 gland-dotted.
Pistillate heads
clustered, proximal to staminates; florets 1.
Staminate heads:
peduncles 0.5-6 mm; involucres obliquely cup-shaped, 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.
2
n
= 72.
Flowering May-Jun(-Oct). Disturbed sites, damp to wet, alkaline soils; 100-200 m; Calif.; Mexico (Baja California).
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This project made possible by National Science Foundation Awards
1601697
,
1600981
,
1601393
,
1600976
,
1601429
,
1601101
,
1601503
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