Weeds: Shepherd’s-purse – Capsella bursa-pastoris categories: Sh-Z Weeds revision date: 2024-06-22 11:01 Family: Brassicaceae (Cruciferae) Cycle: Annual Plant type: Broadleaf Shepherd’s-purse flowers and fruitsPhoto by: T.W. Miller Biology Shepherd’s-purse is an annual or winter annual (sometimes a biennial) plant with a thin taproot. The leaves are primarily in a basal rosette and may have smooth […]
Weeds: Smartweeds – Polygonum spp. categories: Sh-Z Weeds revision date: 2024-06-22 11:02 Family: Polygonaceae Cycle: Annual/Perennial Plant type: Broadleaf Smartweed leavesPhoto by: J.A. Kropf Biology Smartweeds are typically annual weeds with erect or spreading stems up to 3 feet long. The leaves are alternate, attaching to the erect or sprawling stems at enlarged nodes. Many […]
Weeds: Sowthistle, annual and perennial – Sonchus oleraceus, Sonchus arvensis categories: Sh-Z Weeds revision date: 2024-06-22 11:02 Family: Asteraceae (Compositae) Cycle: Annual Plant type: Broadleaf Annual sowthistle flower headsPhoto by: T.W. Miller Biology Annual sowthistle grows upright and can reach from one to four feet tall. The lower leaves have a stalk while the upper […]
Weeds: Speedwells – Veronica spp. categories: Sh-Z Weeds revision date: 2024-06-22 11:02 Family: Scrophulariaceae Cycle: Annual/Perennial Plant type: Broadleaf Speedwell foliage and flowers close-upPhoto by: P.R. Corpuz Biology Three of the speedwell species common in the Pacific Northwest are very similar in appearance. Ivyleaf speedwell (Veronica hederifolia), Persian speedwell (V. persica), and creeping speedwell (V. […]
Weeds: Spurges (Prostrate spurges) – Chamaesyce spp. (Euphorbia spp.) categories: Sh-Z Weeds revision date: 2024-06-22 11:03 Family: Euphorbiaceae Cycle: Annual Plant type: Broadleaf Prostrate spurge with flowersPhoto by: D.G. Swan Biology There are four prostrate weedy spurges that are common in the western United States. All four species are annual plants with opposite leaves and […]
Weeds: Stinging nettle – Urtica dioica categories: Sh-Z Weeds revision date: 2024-06-22 11:03 Family: Urticaceae Cycle: PerennialBroadleaf Plant type: Stinging nettle flowersPhoto by: R. Parker Biology Stinging nettles are typically erect, slender plants reaching two to nine feet high. The opposite leaves are coarsely toothed and often about twice as long as broad. Some varieties […]
Weeds: St. Johnswort, common (Goatweed, Klamathweed) – Hypericum perforatum categories: Sh-Z Weeds revision date: 2024-06-22 11:03 Family: Clusiaceae (Guttiferae) Cycle: Perennial Plant type: Broadleaf St. Johnswort in bloomPhoto by: D.G. Swan Biology Common St. Johnswort is an erect shrubby plant one to three feet high arising from a taproot. Many stems arise from the base […]
Weeds: Tansy ragwort – Senecio jacobaea categories: Sh-Z Weeds revision date: 2024-06-22 11:03 Family: Asteraceae (Compositae) Cycle: Biennial Plant type: Broadleaf Tansy ragwortPhoto by: T.W. Miller Biology Tansy ragwort is a biennial or short-lived perennial spreading by seeds. In lawns, regular mowing may maintain it in a non-flowering perennial form. First-year rosettes have a cluster […]
Weeds: Tumblemustard (Jim Hill mustard) – Sisymbrium altissimum categories: Sh-Z Weeds revision date: 2024-06-22 11:04 Family: Brassicaceae (Cruciferae) Cycle: Annual Plant type: Broadleaf Tumblemustard in bloom image 1Photo by: J.A. Kropf Biology Tumblemustard grows 2-5 feet tall. Seedling plants are low-growing rosettes of deeply lobed leaves. Mature plants have stems that are simple below, and […]
Weeds: Velvetgrass (Common velvetgrass) – Holcus lanatus categories: Sh-Z Weeds revision date: 2024-06-22 11:04 Family: Poaceae (Graminae) Cycle: Perennial Plant type: Grass Velvetgrass floweringPhoto by: T.W. Miller Biology Velvetgrass is a perennial reaching one to three feet high (if unmowed). Typically growing in small, dense clumps, velvetgrass may also spread to form large clumps, especially […]
