Weeds: Stinging nettle – Urtica dioica categories: Sh-Z Weeds revision date: 2024-06-22 11:03 Stinging nettle flowersPhoto by: R. Parker Family: Urticaceae Cycle: PerennialBroadleaf Plant type: 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 St. Johnswort in bloomPhoto by: D.G. Swan Family: Clusiaceae (Guttiferae) Cycle: Perennial Plant type: Broadleaf 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 Tansy ragwortPhoto by: T.W. Miller Family: Asteraceae (Compositae) Cycle: Biennial Plant type: Broadleaf 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 Tumblemustard in bloom image 1Photo by: J.A. Kropf Family: Brassicaceae (Cruciferae) Cycle: Annual Plant type: Broadleaf 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 Velvetgrass floweringPhoto by: T.W. Miller Family: Poaceae (Graminae) Cycle: Perennial Plant type: Grass 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 […]
Weeds: Velvetleaf – Abutilon theophrasti categories: Sh-Z Weeds revision date: 2024-06-22 11:04 VelvetleafPhoto by: J.A. Kropf Family: Malvaceae Cycle: Summer annual Plant type: Broadleaf Biology Velvetleaf is an annual weed that typically grows between three and seven feet tall. Broad, heart-shaped leaves (up to five inches wide) alternate on the upright, branching stems. Five to […]
Weeds: Water primrose – Ludwigia uruguayensis (L. hexapetala) categories: Sh-Z Weeds revision date: 2024-06-22 11:04 Water primrose with flowersPhoto by: Washington Noxious Weed Board slide collection Family: Onagraceae Cycle: Perennial Plant type: Broadleaf aquatic Biology Water primrose is a perennial aquatic herb. Stems sprawl or grow horizontally to erect on water or mud, rooting freely […]
Weeds: Waterhemlock, western – Cicuta douglasii categories: Sh-Z Weeds revision date: 2024-06-22 11:05 Western waterhemlock flower clustersPhoto by: R. Parker Family: Apiaceae (Umbelliferae) Cycle: Perennial Plant type: Broadleaf Biology Western waterhemlock begins growth in the spring. The tall, branching plants reach three to seven feet high by late spring to early summer, when flowering begins. […]
Weeds: Wild carrot (Queen Anne’s lace) – Daucus carota categories: Sh-Z Weeds revision date: 2024-06-22 11:05 Queen Anne’s Lace flowersPhoto by: Jrosenberry1 Creative Commons Alike 4.0 Family: Apiaceae Cycle: Biennial Plant type: Broadleaf Biology Wild Carrot (also known as Queen Anne’s Lace) is an upright, tap rooted herb, reaching 1 to 4 feet tall. It […]
Weeds: Yellow nutsedge – Cyperus esculentus categories: Sh-Z Weeds revision date: 2024-06-22 11:05 Yellow nutsedgePhoto by: Washington Noxious Weed Board slide collection Family: Cyperaceae Cycle: Perennial Plant type: Broadleaf Biology Yellow nutsedge is an aggressive, creeping perennial that resembles a grass but has triangular stems. Plants range in height from 6 to 30 inches tall. […]
