Hunting for the scourge of cyclists... puncturevine!

-

 I've written previously about puncturevine (aka goathead), Tribulus terrestris. Those "caltrop" shaped seeds are the bane of bare feet, dog paws, and bicycle tires. 


Pulling a single puncturevine plant off a sidewalk in Denver.

Puncturevine leaves and flowers.

The University of California IPM program describes the plant as follows:

Mature plant

Plants grow prostrate over open ground, but when shaded or competing with other plants they can grow nearly erect. Stems occasionally grow over 3 feet (1 m) long, have many branches, are green to reddish brown, and spread radially from the crown. Stems and leaves are covered with hairs. Leaves are mostly 2/17 to 1/5 of an inch (3–5 cm) long, finely divided into three to seven pairs of leaflets, and opposite to one another along the stem.

Flowers

Flowering takes place from March through October. Flowers are bright yellow, about 1/5 to 3/5 of an inch (5–15 mm) in diameter, and are produced singly where the stem and leaf stalk meet. They open only on sunny mornings, except in shady areas.

Fruits

The fruit, a woody five-lobed bur, is gray to yellowish tan, hairy, and roughly 1/5 to 2/5 of an inch (5–10 mm) in diameter. Fruits separate at maturity into five (sometimes four) wedge-shaped nutlets, each with two stout spines and several short prickles. Each nutlet usually encloses three to five seeds.


For the past week, my grandson and I have been clearing a single block in a Denver residential area of this noxious plant. We've removed at least 20 pounds, almost all from the park strip (I'm assuming I have the right to pick a plant from the city-owned park strip in front of houses). According to the Colorado Dept. of Agriculture; “Puncturevine is designated as a “List C” species on the Colorado Noxious Weed Act. It is required to be either eradicated, contained, or suppressed depending on the local jurisdictions managing this species."

I'm trying to do my part.






  


Now, if we can get hunters and gatherers to collect and harvest puncturevine with the same zeal  as they search for mule deer and huckleberries...

Comments

Post a Comment

Popular posts from this blog

Voyager of The Seas: giving guests a reason never to cruise again

-
Image
  A "veggie burger" in the Windjammer buffet.  If I wanted mashed potatoes, I'd choose mashed potatoes. After spending a month on the Anthem of the Seas , I was looking forward to a trip on a different ship. And this trip was going to include the entire family, some of whom had never cruised before, so I was looking forward to them being impressed with a week on the Voyager of the Seas. Voyager is a smaller ship than Anthem , so I knew in advance there were some missing amenities. Still, they were all part of the Royal Caribbean corporate ecosystem, so the overlapping elements, like the quality of the food and service or the accuracy of the "Cruise Compass" (a digital or paper calendar detailing everything there is to see and do onboard, from dining times to the location of trivia contests to where all the many musicians are playing) should be similar. It wasn't. The week we returned home, we canceled our future transatlantic cruise on the  Voyager. We neve...
Read more

The one, the only... Chobe National Park, Botswana!

-
Image
We were on our way to the famous Chobe National Park, in northern Botswana.  This visit was somewhat troubling for me.  In May, Botswana's president had announced an  end  to a five year ban on elephant hunting.  Elephant hunting?  There were calls for a boycott against Botswana.  Botswana is a bright spot for African savannah elephants, with over 100,000 in the country.  The proposal was to permit around 400 elephants to be killed by trophy hunters, who presumably would pay $30-50 thousand dollars to kill each of these animals (at $40,000 each, that would come out to $16 million).  There's roughly an equal number of elephants being poached for their ivory each year in Botswana.   I'm going to editorialize on hunting elephants for a moment.  Just scroll down to the white rhino photo below to skip my ramblings. But the overall populations of both forest and savannah elephants in Africa are in steep decline (espe...
Read more

The Tale of the Maui Mystery Cat

-
Image
In 2003, a jaguar was suspected of terrorizing residents of the Olinda area, Maui. Photo of a jaguar attacking a cayman in the Pantanal, Brazil, by Frank Schoen. Copyright: https://www.123rf.com/profile_djambi1969 . Used with permission.      In 2003, I was sitting in a Starbucks across from the Honolulu Zoo in Waikiki, reading the Honolulu Advertiser , when I came across an article about the sighting of a large, cat-like creature on Maui. I don't have that initial article, but I did find an archived copy of an article from Hawaii News Now on the topic: Wildlife officials are planning to intensify efforts today to capture a large catlike animal spotted in the lower Olinda area of Upcountry Maui. A search team sent out yesterday found evidence the animal does exist. They discovered tree trunks with deep scratch marks and a number of doves that appeared to be killed by a catlike paw. Wildlife experts plan to bait an existing trap today and add four more traps. Officials s...
Read more