Weeds: Shepherd’s-purse – Capsella bursa-pastoris categories: Sh-Z Weeds last review date: 2025-10-12 09:53 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 […]
Weeds: Smartweeds – Polygonum spp. categories: Sh-Z Weeds last review date: 2025-10-12 10:02 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 smartweeds […]
Weeds: Sowthistle, annual and perennial – Sonchus oleraceus, Sonchus arvensis categories: Sh-Z Weeds last review date: 2025-10-12 09:59 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 […]
Weeds: Speedwells – Veronica spp. categories: Sh-Z Weeds last review date: 2025-10-13 10:15 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 […]
Weeds: Spurges (Prostrate spurges) – Chamaesyce spp. (Euphorbia spp.) categories: Sh-Z Weeds last review date: 2025-10-13 10:14 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 […]
Weeds: Stinging nettle – Urtica dioica categories: Sh-Z Weeds last review date: 2025-10-13 10:14 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 […]
Weeds: St. Johnswort, common (Goatweed, Klamathweed) – Hypericum perforatum categories: Sh-Z Weeds last review date: 2025-10-13 10:23 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 […]
Weeds: Tansy ragwort – Senecio jacobaea categories: Sh-Z Weeds last review date: 2025-10-13 10:25 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 […]
Weeds: Tumblemustard (Jim Hill mustard) – Sisymbrium altissimum categories: Sh-Z Weeds last review date: 2025-10-13 10:29 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, […]
Weeds: Velvetgrass (Common velvetgrass) – Holcus lanatus categories: Sh-Z Weeds last review date: 2025-10-13 10:35 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, […]
