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Adapted from Jim Conrad's
Naturalist Newsletter of December 11, 2006
issued from Sierra Gorda Biosphere Reserve,
QUERÉTARO, MÉXICO

ACAHUAL
THE PRETTY SUNFLOWER

A plant looking more familiar than the above to eyes most accustomed to the eastern North American landscape also is flowering now along roads and in fields. The plant looks a good bit like the North's multi-flowered sunflower species, such as the Jerusalem Artichoke, except it has larger flowers. It's the Acahual, TITHONIA TUBAEFORMIS. You can see one at the Reserve's entrance below.

Acahual, TITHONIA TUBAEFORMIS


Beyond the fact that the plant is so big and colorful -- on overcast days the three-inch-wide (7.5 cm), yellow- orange flowers just explode with cheerful brightness -- one reason the species is interesting is because usually weeds are alien invasives, but Acahual is native to here, northeastern Mexico. In fact, the species has begun showing up as a weed in other tropical countries, such as northwestern Argentina. One reason for Acahual's success is that it produces prodigious numbers of little black seeds -- to the delight of seed-eating birds.

The name Acahual is from the Náhuatl language and I'm told by Native American employees at the Reserve that the name is applied to several very different weedy plants that appear when the ground is disturbed.

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