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DESCRIPTION:
Longspine sandbur, a summer annual grass, occurs sporadically throughout the
western states and favors sandy or well-drained soil. Seedlings closely
resemble those of barnyardgrass. Seedling leaves are flattened and have a
purplish tinge at the bottom. The most distinctive characteristic for
seedling identification is the bur, from which the young plant emerges. It
may be found by digging carefully around the roots. Mature plants are
branched, usually spreading in mats. Flower spikes contain burs that are
yellowish green, turning to a light brown when they mature. Up to 40 burs
may occur in a spike that is partially enclosed by a leaf sheath.
Grass ID illustration.
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