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

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Tuesday - March 22, 2005

From: Brooklyn, NY
Region: Northeast
Topic: Non-Natives
Title: Invasive, non-native Eragrostis cilianensis, stink grass
Answered by: Nan Hampton

QUESTION:

I am writing a children's book for Darby Creek Publishing about smelly plants and animals. I have read that Eragrostis cilianensis is one of the few bad-smelling grasses. Would the purpose of the odor be to protect the plant from being eaten? If so, why don't more grasses smell bad?

ANSWER:

Eragrostis cilianensis, stink grass, is an invasive non-native grass from the Mediterranean that now occurs throughout the United States and is considered a weed. Livestock will eat it when it is young, but is generally avoided when it is mature or there are more desirable grasses to eat. The disagreeable odor (and, presumably, taste) comes from glands which occur in rings below the leaf nodes. There seems to be some disagreement as to whether it is just unpalatable or poisonous. It is reported that the grain from stink grass is consumed by humans in Africa during famine situations.

It is debatable whether the bad smell evolved as a defense against grazing or evolved to attract a particular pollinator. Grasses do have other defense mechanisms that keep most mammals from successfully using them as food. Grasses contain cellulose fibers that are indigestible by most animals and many have sharp silica inclusions as well. Ungulates (animals with hooves), however, have evolved specialized teeth that continue to grow throughout their lives to cut and chew the grasses without wearing away their teeth and they have specialized stomachs with symbiotic bacteria to digest the cellulose.
 

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