Harvestlice (Agrimonia parviflora)
Description
Agrimonia parviflora is a species of perennial herbaceous flowering plants. Small-flowered agrimony, harvestlice agrimony, swamp agrimony, and harvestlice are its most common names in the United States. This plant species is part of the Rosaceae (rose) family. Globally, the genus Agrimonia consist of about fifteen species of plants. Seven of these species are native to the United States. Most members of this genus have small yellow flowers with large leaves. Out of the fifteen species, harvestlice is considered the most noxious weed. Agrimonia parviflora can grow up to 6.0 feet tall with long, fibrous roots growing up to 6 inches in length. It is an erect plant with multiple stems which grows rapidly. Harvestlice has multiple small yellow flowers in midsummer. Some plants may contain as many as 100 flowers. Yellow flowers contains 5 petals and has 5-10 stamens. The flowers are one fourth of an inch in diameter. The flowers occur in an elongate inflorescence and have a hypanthium structure. Plants will fruit and seed in the summer and will senesce in the fall. Fruit are 4–5 mm in length and are green in color. The calyx is a 10 ribbed tubernate. Stem is pubescent while the primary leaflets are glabrous on top and slightly pubescent on the underside. Compound leaves are odd pinnate and are alternating. Each leaf can contain up to 17 primary leaflets that are lanceolate in shape with toothed edges. In between the primary leaflets, secondary leaflets can be found which are much smaller than the primary leaflets and are also toothed.
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: Magnoliopsida
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Order: Rosales
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Family: Rosaceae
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Genus: Agrimonia
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