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Ambrosia cheiranthifolia
A. Gray
Family:
Asteraceae
Rio Grande Ragweed,
more...
South Texas ambrosia
Images
not available
FNA
Resources
John L. Strother in Flora of North America (vol. 21)
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 cup-shaped (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).
2
n
= 72.
Flowering Jun-Nov. Seasonally wet clays or sands, scrublands; 10-30+ m; Tex.; Mexico (Tamaulipas).
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