Weeds: Prickly lettuce (China lettuce) – Lactuca serriola categories: Pr-Sc Weeds last review date: 2025-10-12 08:00 Family: Asteraceae (Compositae) Cycle: Annual/Biennial Plant type: Broadleaf Prickly lettuce leavesPhoto by: R. Parker 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 […]
Weeds: Prostrate knotweed – Polygonum aviculare categories: Pr-Sc Weeds last review date: 2025-10-12 08:03 Family: Polygonaceae Cycle: Annual Plant type: Broadleaf Prostrate knotweed leavesPhoto by: R. Parker 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 […]
Weeds: Puncturevine (Tackweed, Goathead) – Tribulus terrestris categories: Pr-Sc Weeds last review date: 2025-10-12 08:07 Family: Zygophyllaceae Cycle: Annual Plant type: Broadleaf PuncturevinePhoto by: R. Parker 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 […]
Weeds: Purple deadnettle (Red deadnettle) – Lamium purpureum categories: Pr-Sc Weeds last review date: 2025-10-12 08:09 Family: Lamiaceae (Labiatae) Cycle: Annual Plant type: Broadleaf Purple deadnettle flowersPhoto by: C.R. Foss 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. […]
Weeds: Purple loosestrife (Purple lythrum) – Lythrum salicaria categories: Pr-Sc Weeds last review date: 2025-10-12 08:54 Family: Lythraceae Cycle: Perennial Plant type: Broadleaf Purple loosestrife in bloomPhoto by: N.R. Ness 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 […]
Weeds: Purslane, common – Portulaca oleracea categories: Pr-Sc Weeds last review date: 2025-10-12 08:58 Family: Portulacaceae Cycle: Annual Plant type: Broadleaf Common purslane succulent leaves and flowerPhoto by: D.G. Swan 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 […]
Weeds: Quackgrass – Elymus repens (Elytrigia repens, Agropyron repens) categories: Pr-Sc Weeds last review date: 2025-10-12 09:03 Family: Poaceae (Graminae) Cycle: Perennial Plant type: Grass QuackgrassPhoto by: D.G. Swan 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 […]
Weeds: Red sorrel (Sheep sorrel) – Rumex acetosella categories: Pr-Sc Weeds last review date: 2025-10-12 09:05 Family: Polygonaceae Cycle: Perennial Plant type: Broadleaf Red sorrel leavesPhoto by: T.W. Miller 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 […]
Weeds: Redroot pigweed (Rough pigweed) – Amaranthus retroflexus categories: Pr-Sc Weeds last review date: 2025-10-12 09:07 Family: Amaranthaceae Cycle: Annual Plant type: Broadleaf Redroot pigweedPhoto by: D.G. Swan Biology Redroot pigweed is a course, erect plant, growing two to three feet tall. The lower stems and branches and the upper portion of the taproot are […]
Weeds: Redstem filaree (Stork’s bill, Crane’s bill) – Erodium cicutarium categories: Pr-Sc Weeds last review date: 2025-10-12 09:11 Family: Geraniaceae Cycle: Annual Plant type: Broadleaf Redstem filaree fruit and flowersPhoto by: R. Parker Biology Redstem filaree is typically a winter annual (sometimes a biennial) growing from a rosette. The one- to two-foot stems may be […]
