En EspaŅol

Q. Who is Mr. Smarty Plants?

A: There are those who suspect Wildflower Center volunteers are the culpable and capable culprits. Yet, others think staff members play some, albeit small, role. You can torture us with your plant questions, but we will never reveal the Green Guru's secret identity.

Help us grow by giving to the Plant Database Fund or by becoming a member

Did you know you can access the Native Plant Information Network with your web-enabled smartphone?

Share

Ask Mr. Smarty Plants

Ask Mr. Smarty Plants is a free service provided by the staff and volunteers at the Lady Bird Johnson Wildflower Center.

Search Smarty Plants
    
 
See a list of all Smarty Plants questions
Can't find the answer in our existing FAQs, submit a question to Mr. Smarty Plants.
Need help with plant identification, visit the plant identification page.
 
rate this answer
Not Yet Rated

Friday - April 06, 2012

From: San Antonio, TX
Region: Southwest
Topic: Plant Identification
Title: Dodder
Answered by: Anne Ruggles & Nan Hampton

QUESTION:

I have seen patches of Bluebonnets that are covered with a stringy,rubbery,orange substance that seems to be choking out the particular patch. It wraps itself around the flowers,completely covering them and killing them. I am sure it is some kind of weed, but I have never seen it before. It spreads very quickly. I am wondering what it is, and if it has capabilities to do damage to large amounts of bluebonnets.

ANSWER:

We have had another observant reader ask this question, too.  You are seeing a species of Dodder, a very unusual and interesting native plant. There are more than 20 species species found in Texas many of which are described on the Wildflower Center's Native Plant Database. There are more than 150 species worldwide, although Dodder is most prevalent in the Americas.  

We checked with two botanists (Laura Hansen and Bill Carr) who have experience with Dodder and both said they would not venture an identification as this is a difficult plant to identify to species and requires a dissecting scope. One of the botanists (Carr) did, however, offer this which is fun to say aloud.

        No one seems to give a hoot a

        'Bout the species of Cuscuta

        Maybe they all think it's fine

        To simply call it bailing twine.

As a species, we humans have been very creative in naming it. We have also called it: love vine, strangleweed, devil's-guts, goldthread, pull-down, devil's-ringlet, hellbine, hairweed, devil's-hair, and hailweed.

Dodder (in the genus Cuscuta), is an annual, twining yellow or orange parasitic plant that is classified in its own family, the Dodder Family (Cuscutaceae). Its water, minerals and carbohydrates are absorbed from the host through haustoria (modified adventitious roots) that penetrate the host's tissue.

It produces many tiny whitish flowers from early June to the end of the growing season. The tiny seeds are yellow to brown or black and are about 1/8” in diameter. The seeds drop to the ground and germinate the next growing season if a suitable host is present. If no suitable host is present, the seed may remain dormant for up to 60 years depending on the species and environmental conditions. Moist soil and sunlight are required for germination. Dodder seedlings must attach to a suitable host within a few days of germinating. The stem gropes in the air until it makes contact with a plant at which point the seedling coils around the plant a couple of times. If this plant is a suitable host, the dodder will sprout haustoria which will penetrate the stem. The basal part of the seedling shrivels away so that no soil connection exists. Dodder species vary in the number of host species they can infect. Some are rather restricted in both habitat and host preference and other species are quite cosmopolitan.

Other good sources of information about this interesting plant are:

1.  There is a very good piece about Dodder on the Nature Writers of Texas blog by Ro Wauer from July 2006; "Dodder Looks Like Tangled Yellow-Orange Twine."

2.  The University of California at Davis has a very descriptive web page, with photos, devoted to Dodder.

3.  Mr. Smarty Plants discussed non-native Dodders a couple of years ago.

4.  The USDA Natural Resources Conservation Service has photos and distribution maps of Dodder across the United States.

Dodder appears to be prevalent this year, perhaps because of the good rain parts of Texas are finally getting. It is a parasite and yes it will damage the host plant, but there are so many bluebonnets this year that it is not likely to have a population effect on them.

 

From the Image Gallery


Smartweed dodder
Cuscuta polygonorum

Smartweed dodder
Cuscuta polygonorum

More Plant Identification Questions

Identity of plant in Kentucky with fuzzy grayish-green leaves
September 03, 2012 - I would like to know about a plant that I do not know what it is. I had this plant just come up in my flowerbed, that looked like a tobacco plant but the leaves looked like a lambs ear plant. It was ...
view the full question and answer

Identity of purple flower with flowers similar to witch hazel
August 16, 2012 - Found along woods roads. Purple flower about 1 - 2 ft. in height. Central stem rises from a ground level leaf whorl of five leaves from 4 to 7 inches long and 2 to 3 inches at their widest point. C...
view the full question and answer

Help with plant ID
September 01, 2004 - I found this plant alongside the road in a field in North Dallas. The dirt was fairly dry, and image is attached.
view the full question and answer

Plant identification
August 22, 2011 - I have a rather large berry growing on a tree-like bush in my back yard here in Williamsville Vermont, I've never seen anything like it! I have a picture.
view the full question and answer

Plant identification
August 25, 2013 - Found a plant with tiny, white, fragrant flowers on spires by a lake near Fredericksburg, TX. Could you possibly identify it?
view the full question and answer

Smarty Plants's Facebook profile Support the Wildflower Center by Donating Online or Becoming a Member today.

Mr. Smarty Plants wants you to be his Facebook friend. Click the Facebook icon to add yourself to Mr. Smarty Plants list of friends.
E-NEWSLETTER | BECOME A MEMBER | DONATE NOW | MEDIA | SITEMAP
© 2014 Lady Bird Johnson Wildflower Center