While hiking recently I got to thinking
about the various plants that stick to our sock and pants. Certainly, they are frustrating; but, as a
plant geek, I wanted to know more.
Sticky plants attaching to clothes, hair,
fur, and feathers to disperse their seeds into new areas. They do this with hooks,
spines, barbs, and burrs. Let’s look at a few common examples that we find here
in central Illinois.
The biggest challenge on my property is Spanish
Needles (Bidens bipinnata). This
weedy plant grows one to three foot tall in dry, shady areas. Its leaves are
finely textured, looking a bit like flat-leaved parsley. The non-showy, yellow
flowers develop into 2-4 prong, barbed fruit. They get their name from the
fruit’s needle-like prongs, each with its own
backward pointing barb.
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Virginia Stickseed |
Virginia Stickseed (Hackelia virginiana), also
called beggar’s lice, has very small prickly bur fruit that clings to clothing.
It grows one to four foot tall in dry woods. The burs are less than ¼” in size.
Burs are arranged along one side of stems (racemes) that are held 2-8” above
the plant.
Probably the most commonly known
hitchhikers are burdock and cocklebur. In fact, Velcro is said to have been designed
after the burs of the burdock plant. After a hunting trip, the inventor looked closer at the tiny hooks on the bur and
created the hook and loop fasteners design.
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Cocklebur |
Burdock (Arctium sp.) is a robust plant. It is also called wild rhubarb due
to its large leaves that can reach 20” long. This is a biennial plant that
grows rhubarb-like leaves the first year. In the second year, it sends up 2-5
foot stalk with large egg-shaped leaves and ½ to 1” bristly purple flowers. Each
fruit is a prickly, clinging bur. Unlike rhubarb whose stems are edible,
burdock has an edible taproot.
Cocklebur (Xanthium sp.) is related to burdock. This plant sprouts from seed
each year, reaching 2-5 foot by summer’s end. Its triangular, lobed leaves are 2-6”
long. Cocklebur has both male and female green colored flowers. Female flowers
form ½-3/4” burs that are held in the axils of the leaves. The football-shaped burs
cling with hook-tipped prickles.
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Bedstraw
|
Bedstraw (Gallium sp.) is sometimes called velcro-plant or stickywilly. Bedstraw attached to us in two ways. Its leaves and stems
have fine hook-like hairs that cling to clothing and fur. However, it is the extremely
small seeds that really create havoc. At less than 1/25 of an inch, the seed
burs are covered with small hooked bristles. Because each plant produces
hundreds of seeds, they quickly cover large areas of clothing. Their small size
and abundance make them difficult to
remove.
There are many
more, but you get the idea. I have not developed a magic way for removing these
from my clothes or pet’s hair. Washing clothes does
not remove most hitchhiker seeds. They usually need to be picked off
individually, though some can be scraped off with a butter knife.
Enjoy a fall hike in the woods, but try to
avoid those hitchhikers!
Published in Canton Daily Ledger Column 11-4-2017