Dark Green Bulrush (Scirpus atrovirens)
Description
This perennial plant is about 2��4' tall, unbranched, and more or less erect. The culm is green, glabrous, and terete. There are up to 8 alternate leaves along the entire length of the culm. The leaf blades are up to 1�' long and �" (19 mm.) across; they are yellowish green to dark green, glabrous, linear in shape, flattened, furrowed along the middle, and rough-textured along their margins. These blades are arching or rather floppy. Leaf venation is parallel; on some leaf blades, there are observable cross-veins connecting the parallel veins at short intervals along the blade (septate). The sheaths are light green to green, glabrous, septate, and closed. The culm terminates in an inflorescence consisting of 1-3 (rarely 4-5) compound umbels of spikelets. There are 3 or more spreading leafy bracts underneath this inflorescence. The characteristics of the leafy bracts are similar to those of the leaf blades; they are up to 1' long and �" (12 mm.) across. These bracts are variable in size, but at least one of them is longer than the inflorescence.
Taxonomic tree
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Domain: Eukarya
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Kingdom: Plantae
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Phylum: Magnoliophyta
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Class: Liliopsida
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Order: Poales
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Family: Cyperaceae
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Genus: Scirpus
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