Gypsum Threeawn (Aristida gypsophila)
Description
Gypsophila are annual and perennial herbs often growing from a thick taproot or a branching caudex, sometimes with rhizomes. The stems are usually erect and branching or sprawling, or in a few species prostrate along the ground. The leaves are variable in shape. The inflorescence is usually a cyme or a thyrse, branching intricately. Each small flower has a cup-like calyx of white-edged green sepals containing five petals in shades of white or pink. The fruit is a rounded or oval capsule opening at valves. It contains several brown or black seeds which are often shaped like a kidney or a snail shell.
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: Poaceae
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Genus: Aristida
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