Pink, Rose, Red, or Purple Flowered Forbs

Pink, Rose, Red & Purple Flowered Forbs
Black henbane
Blue Mustard
Bull thistle
Canada thistle
Common burdock
Diffuse knapweed
Iberian knapweed
Meadow knapweed
Musk thistle
Purple loosestrife
Purple starthistle
Red clover
Redstem filaree
Russian knapweed
Scotch thistle
Spiny plumeless thistle
Spotted knapweed
Squarrose knapweed
Tall morning-glory


Purple Loosestrife
Lythrum salicaria L. (Loosestrife family, Lythraceae)


Erect, single- or multi-stemmed, clump or patch-forming perennial forb or subshrub; 6 to 8 feet tall, taprooted; rose-purple flowers are showy; flowers are borne on elongated dense or open raceme, with an erect or drooping tip.

Leaves: Stems are typically covered with short hairs; leaves lanceolate, 2 to 5-1/2 inches long; bases slightly lobed (cordate), covered with short hairs or glabrous, mostly opposite or whorled; upper leaves sometimes alternate.

Flowers: Flowers June to September; flowers showy, bright pinkish-purple, with 5 to 7 rough margined petals, 3/8 to 9/16 inch long; ovary superior but appears inferior, surrounded by and not fused to calyx tube.

Fruit: Capsules oblong-ovoid, 3/16-1/4 inch long, surrounded by persistent calyx tube, open into halves at tip; seeds numerous, reddish-brown, flattened, sometimes 3-angled in cross-section, often concave on 1 side, less than 1/16 inch long.


Cultivated and disturbed or degraded sites in perennial and seasonal wetlands, including marsh and pond edges, streambanks, canals, and ditches; within elevations that generally range from 4,500 to 6,800 feet.


Reproduces primarily by seed; however, stem fragments can develop roots under favorable conditions; large plants can produce more than 2 million viable seeds in one season; seedlings can mature and flower within 8 to 10 weeks.


Native to Europe; plants often form dense colonies that displace native vegetation and wildlife. Arizona prohibited noxious weed, New Mexico Class A noxious weed, and Texas noxious plant.

Coll;age of 4 images of Purple loosestrife


Forest Service Shield
Invasive plants and weeds of the national forests and grasslands in the southwestern region
Purple loosestrife flowers Purple loosestrife flowering inflorescense Purple loosestrife foliage Purple loosestrife plants