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Taeniatherum caput-medusa is an annual grass that is 8-24 in. (20.3-61 cm) tall and has distinct bristly seed heads and few leaves.

Foliage

Leaves are less than 0.13 in. (0.32 cm) wide. One or more stems arise from the base of the plant and can be as much as 2 ft. (0.6 m) tall. Each stem produces a single, short, spike-type seed head.

Flowers

Flowering occurs in late spring, when flower heads develop at the apex of the stems. Flowering occurs in late spring and early summer.

Fruit

The seed heads are what distinguish this plant from other annual grasses. Awns twist as they dry, hence the common name "medusahead". The longer of the two awns in each spikelet is barbed. These barbs catch on fur or clothing and spread seed.

Ecological Threat

T. caput-medusa was first collected in Oregon, in 1887. Plants invade dry, open lands with frequent disturbance such as fields and pastures. It is native to the Mediterranean.

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Thu, 28 Mar 2024 10:45:16 -0400 Thu, 28 Mar 2024 10:45:16 -0400 http://Images.bugwood.org/ <![CDATA[medusahead Taeniatherum caput-medusae]]> http://www.ipmimages.org/browse/detail.cfm?imgnum=1459334 medusahead Taeniatherum caput-medusae]]> http://www.ipmimages.org/browse/detail.cfm?imgnum=1459334 <![CDATA[medusahead Taeniatherum caput-medusae]]> http://www.ipmimages.org/browse/detail.cfm?imgnum=1459342 medusahead Taeniatherum caput-medusae]]> http://www.ipmimages.org/browse/detail.cfm?imgnum=1459342 <![CDATA[medusahead Taeniatherum caput-medusae]]> http://www.ipmimages.org/browse/detail.cfm?imgnum=2149099 medusahead Taeniatherum caput-medusae]]> http://www.ipmimages.org/browse/detail.cfm?imgnum=2149099 <![CDATA[medusahead Taeniatherum caput-medusae]]> http://www.ipmimages.org/browse/detail.cfm?imgnum=1459335 medusahead Taeniatherum caput-medusae]]> http://www.ipmimages.org/browse/detail.cfm?imgnum=1459335 <![CDATA[medusahead Taeniatherum caput-medusae]]> http://www.ipmimages.org/browse/detail.cfm?imgnum=1459331 medusahead Taeniatherum caput-medusae]]> http://www.ipmimages.org/browse/detail.cfm?imgnum=1459331 <![CDATA[medusahead Taeniatherum caput-medusae]]> http://www.ipmimages.org/browse/detail.cfm?imgnum=5309011 medusahead Taeniatherum caput-medusae]]> http://www.ipmimages.org/browse/detail.cfm?imgnum=5309011 <![CDATA[medusahead Taeniatherum caput-medusae]]> http://www.ipmimages.org/browse/detail.cfm?imgnum=1459332 medusahead Taeniatherum caput-medusae]]> http://www.ipmimages.org/browse/detail.cfm?imgnum=1459332 <![CDATA[medusahead Taeniatherum caput-medusae]]> http://www.ipmimages.org/browse/detail.cfm?imgnum=1459337 medusahead Taeniatherum caput-medusae]]> http://www.ipmimages.org/browse/detail.cfm?imgnum=1459337 <![CDATA[medusahead Taeniatherum caput-medusae]]> http://www.ipmimages.org/browse/detail.cfm?imgnum=1459340 medusahead Taeniatherum caput-medusae]]> http://www.ipmimages.org/browse/detail.cfm?imgnum=1459340 <![CDATA[medusahead Taeniatherum caput-medusae]]> http://www.ipmimages.org/browse/detail.cfm?imgnum=1299155 medusahead Taeniatherum caput-medusae]]> http://www.ipmimages.org/browse/detail.cfm?imgnum=1299155 <![CDATA[medusahead Taeniatherum caput-medusae]]> http://www.ipmimages.org/browse/detail.cfm?imgnum=5307038 medusahead Taeniatherum caput-medusae]]> http://www.ipmimages.org/browse/detail.cfm?imgnum=5307038