Conium maculatum
(Poison Hemlock)
Conium maculatum, Overland Trail Recreation Area, Sterling, Logan Co. 7250
Conium maculatum, Overland Trail Recreation Area, Sterling, Logan Co. 7265
Conium maculatum, Overland Trail Recreation Area, Sterling, Logan Co. 7255
Conium maculatum, Overland Trail Recreation Area, Sterling, Logan Co. 7261
| Scientific Name | Conium maculatum | USDA PLANTS Symbol | COMA2 |
| Common Name | Poison Hemlock | ITIS Taxonomic Serial No. | 29473 |
| Family | Apiaceae (Parsley) | SEINet Reference |
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| Description |
Life zones and habitat: Plains and foothills (3600 to 8700 ft.); moist soils in roadside ditches and disturbed areas. Plant: Tall, erect, branching, biennial 2 to 10 ft. tall; hollow, purple-spotted stems; herbaceous rosette in the first season, upright floral stems in the second season. Plant has a disagreeable odor and all parts are very poisonous. Leaves: Compound basal and stem leaves finely pinnately or ternate-pinnately-dissected with a fern-like appearance, 6 to 12 inches long overall. Inflorescence: Loose inflorescence of umbels 1 to 3 inches in diameter; small white flowers with 5 petals and an enlarged style base. Bloom Period: June to August. References: "Flora of Colorado" by Jennifer Ackerfield, SEINet and UW Burke Herbarium. |
BONAP Distribution Map Map Color Key |
Colorado Status: Introduced NOXIOUS WEED |
© Tom Lebsack 2024
Banner photo: Castilleja rhexifolia and a brewing storm over the San Juan Mountains