Herbaceous, aquatic flowering plant. Grows in dense clusters partially submerged in still or flowing… read more
Dwarf, tufted plant, grayish in color with dense, shaggy leaves and short spikes of rose-pink flower… read more
Alligatorweed
Alternanthera philoxeroides
Introduced. A usually aquatic plant that forms mats and is considered a noxious weed in the United S… read more
Introduced. A Eurasian perennial with green-and-white leaves, usually divided in 3s, that is cultiva… read more
Native perennial. Branching, erect, 3-6 ft height. Leaf: pinnate, with rounded toothed leaflets, whi… read more
Water Hemlock
Cicuta maculata (Cicuta mexicana)
Native perennial. Height: 3-7 feet. Habit: erect with hollow stem. The long leaves are made up of se… read more
Biennial. Height: 5-8 ft tall. Habit: coarse. Smooth green stem, usually spotted or streaked with re… read more
Honewort
Cryptotaenia canadensis
Native perennial. Habit: erect. Height: 1' - 3'. Flower: open, irregular white umbel 2" across. Leaf… read more
This is the wild form of the cultivated carrot. Biennial. Height: 3 ft. or more. Flowers are umbels,… read more
Native. Habit: erect, opposite, with a smooth silver stem. Height: 18-24 inches. Leaf: narrow silver… read more
Native perennial. Height: to 6 ft. Habit: grass-like, usually unbranched except at top, entire plant… read more
Perennial. Habit: erect, height to 7 ft, with a strong odor of anise. Leaf: wispy, finely dissected… read more
Beach Silvertop
Glehnia littoralis ssp. leiocarpa
Low-spreading perennial herb with a long taproot that forms a basal patch of pinnate leaves in roset… read more
Introduced; noxious weed. A tree-size herbaceous plant with giant white, umbrella-shaped flower clus… read more
Cow Parsnip
Heracleum maximum (Heracleum lanatum)
Very tall perennial herb with very large leaves and white flat-topped or rounded flower clusters whe… read more
Native perennial. Habit: prostrate & creeping, with long thin stems often formimg dense mats. Leaves… read more
Perennial herb in the carrot (Apiaceae) family growing from a thick taproot with clusters of flowers… read more
Native perennial. Habit: grass-like. Height: 6 inches to 3 ft. Flower: small yellow umbels, 3" acros… read more
Native perennial. Stem: hairless to lightly hairy. Height: up to 1.5 feet. Leaf: pinnate and finely … read more
Native perennial. Height: up to 40 inches. Habit: lax, often reclining. Leaves: blades up to 1 foot… read more
Native perennial. Habit: single stem covered with soft white hairs, 1-3 ft height. Leaf: toothed or … read more
Introduced biennial. Height: 1-5'. Habit: erect, with ridged stems, alternate. Leaf: pinnate, with 5… read more
Yampah
Perideridia gairdneri
Native perennial. Caraway-scented. Height: to 5'. Habit: erect, slender, alternate. Leaf: pinnate, w… read more
Native perennial. Fragrant. Height: 2-6'. Habit: stout & erect, with single smooth stem, alternately… read more
Native herbaceous perennial.
Habit: erect; stems green to white, roughly hairy; tuberous root.
He… read more
A cluster of several leafy stems bearing bright yellow flowers in compound umbels.
Flowers: Umbe… read more
Perennial forb. Habit: upright. Height: 1 – 2 feet. Leaf: lanceolate or ovate, serrated, lobed… read more
Indian-hemp
Apocynum cannabinum (Apocynum sibiricum)
The strong, erect, purplish stem of Indian-hemp rises 3-4 ft., with branches ascending from the uppe… read more
Native perennial forb. Habit: erect, height 1-2 feet,with a single smooth stem holding 3 leaves. Lea… read more
Introduced. A vine widely planted as a ground cover, with distinctive leathery evergreen leaves.
… read more
Native perennial forb. Habit: erect, 4-8 inch height. Leaf: palmate, single whorl of 3 to 5 leaflets… read more
Spider Antelope-horns is a clump-forming, 1-2 ft. perennial with an upright or sprawling habit. Its… read more
Native perennial forb. A flowering perennial with thick, white, woolly stems which bend or run along… read more
A 1-2 1/2 ft. perennial with several erect stems and narrow, whorled leaves. Several 4-5 in. wide f… read more
The smooth, stout, unbranched stems of this milkweed generally occur in spreading clusters which asc… read more
Native herbaceous perennial. Upright, 3 to 5 feet tall, with thick, fleshy, white roots. Typically, … read more
Native herbaceous perennial, erect, to 4 feet tall. Flower: orange, several, densely-flowered, mos… read more
Native herbaceous perennial. Hairy, erect perennial. The large, pointed, bananalike leaves are arran… read more
| 
search results 
