Botanical name: Eleocharis geniculata    Family: Cyperaceae (Sedge family)
Synonyms: Cyperus capitatus, Eleocharis capitata, Eleogenus capitatus

Knoblike Spikesedge is an annual herb growing to a maximum height of about 40 cm. It has a few straw-colored leaves and many thin erect stems. The stems hold knob-like spikelets, 3-5 x 3-3.5 mm, each containing at least 10 tiny flowers. The flowers are covered with dark greenish-brown bracts. The fruit is a shiny purple-brown achene not more than a millimeter long. Knoblike Spikesedge is found near shallow water margins at trail edges, sandy coastal habitats, ponds, standing water, and is widely distributed across the tropical and subtropical world.

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The flower labeled Knoblike Spikesedge is ...