Cuscuta denticulata Engelm.

Desert Dodder
Convolvulaceae (Dodder Family)


 

Desert dodder is one of several dodders that might be found in the desert but is likely the most common one.  It is a slender-stemmed parasitic annual that is usually seen twining around and through herbs and shrubs in creosote bush scrub and joshua tree woodland in the northern Colorado and Mojave Deserts.  The stems are pale yellow to orange, and like other dodders it exists by attaching itself to its host's branches by means of little wartlike bumps called 'haustoria.'  First it sprouts from a seed, then it twines counter-clockwise around a plant's stem or branch, tightening its grip on its host and pushing its haustorium into the stem.  By now the dodder's connection to the ground has been broken, and since it cannot make food of its own it must depend on its host and draw its nourishment through the haustorium. Although dodder usually doesn't kill its host plant, a heavy infestation in times of limited water supply may cause significant damage.  C. denticulata produces small white flowers with shallowly bell- to urn-shaped corollas.  The five corolla lobes become reflexed in age.  Inside the corollas are appendages each of which has 0-few knoblike divisions.  Desert dodder grows to an elevation of about 4000' and blooms from May to October.  Other names for dodder which I've encountered are devil guts, witch's shoelaces, witch's hair, angel hair and hairweed.  These pictures were taken in Death Valley NP and I believe the host plant in this case is Peucephyllum schottii.

Click here for Latin name derivations: 1) Cuscuta  2) denticulata.
Pronunciation: koos-KOO-ta den-tik-yoo-LAY-ta.
Click here for Botanical Term Meanings.

 


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