Weeds: Prickly lettuce (China lettuce) – Lactuca serriola categories: Pr-Sc Weeds revision date: 2024-06-22 10:55 Prickly lettuce leavesPhoto by: R. Parker Family: Asteraceae (Compositae) Cycle: Annual/Biennial Plant type: Broadleaf Biology Prickly lettuce grows from one to five feet tall from a large taproot. The sap is milky. Seedling plants have slightly lobed leaves with spines […]
Weeds: Prostrate knotweed – Polygonum aviculare categories: Pr-Sc Weeds revision date: 2024-06-22 10:55 Prostrate knotweed leavesPhoto by: R. Parker Family: Polygonaceae Cycle: Annual Plant type: Broadleaf Biology Prostrate knotweed is a low-growing plant with wiry stems and a thin taproot. Plants branch extensively at the base, with branches lying along the ground but not rooting. […]
Weeds: Puncturevine (Tackweed, Goathead) – Tribulus terrestris categories: Pr-Sc Weeds revision date: 2024-06-22 10:56 PuncturevinePhoto by: R. Parker Family: Zygophyllaceae Cycle: Annual Plant type: Broadleaf Biology Puncturevine is a prostrate plant growing from a taproot. Above ground, the branching, trailing stems grow one to six feet and are green to reddish in color. Leaves are […]
Weeds: Purple deadnettle (Red deadnettle) – Lamium purpureum categories: Pr-Sc Weeds revision date: 2024-06-22 10:56 Purple deadnettle flowersPhoto by: C.R. Foss Family: Lamiaceae (Labiatae) Cycle: Annual Plant type: Broadleaf Biology Purple deadnettle has the square stems and opposite leaves characteristic of most plants in the mint family. Plants usually branch from the spreading base. Leaves […]
Weeds: Purple loosestrife (Purple lythrum) – Lythrum salicaria categories: Pr-Sc Weeds revision date: 2024-06-22 10:56 Purple loosestrife in bloomPhoto by: N.R. Ness Family: Lythraceae Cycle: Perennial Plant type: Broadleaf Biology Purple loosestrife is an erect plant growing six to eight feet tall from a woody, rhizomatous root system. The original plant spreads to form a […]
Weeds: Purslane, common – Portulaca oleracea categories: Pr-Sc Weeds revision date: 2024-06-22 10:58 Common purslane succulent leaves and flowerPhoto by: D.G. Swan Family: Portulacaceae Cycle: Annual Plant type: Broadleaf Biology Common purslane reproduces by seeds, but it can also root from the stems or stem fragments which contact the soil. Common purslane is usually a […]
Weeds: Quackgrass – Elymus repens (Elytrigia repens, Agropyron repens) categories: Pr-Sc Weeds revision date: 2024-06-22 10:58 QuackgrassPhoto by: D.G. Swan Family: Poaceae (Graminae) Cycle: Perennial Plant type: Grass Biology Quackgrass is a perennial grass which spreads by both seeds and rhizomes, forming dense clumps if left unchecked. The spreading rhizomes are typically pale yellow in […]
Weeds: Red sorrel (Sheep sorrel) – Rumex acetosella categories: Pr-Sc Weeds revision date: 2024-06-22 10:59 Red sorrel leavesPhoto by: T.W. Miller Family: Polygonaceae Cycle: Perennial Plant type: Broadleaf Biology Red sorrel has a creeping root system and spreads aggressively by underground roots and rhizomes. The upright, somewhat woody stems grow to a height of 1/2 […]
Weeds: Redroot pigweed (Rough pigweed) – Amaranthus retroflexus categories: Pr-Sc Weeds revision date: 2024-06-22 10:59 Redroot pigweedPhoto by: D.G. Swan Family: Amaranthaceae Cycle: Annual Plant type: Broadleaf Biology Redroot pigweed is a coarse, erect plant, growing two to three feet tall. The lower stems and branches and the upper portion of the taproot are frequently […]
Weeds: Redstem filaree (Stork’s bill, Crane’s bill) – Erodium cicutarium categories: Pr-Sc Weeds revision date: 2024-06-22 10:59 Redstem filaree fruit and flowersPhoto by: R. Parker Family: Geraniaceae Cycle: Annual Plant type: Broadleaf Biology Redstem filaree is typically a winter annual (sometimes a biennial) growing from a rosette. The one- to two-foot stems may be low […]
