Apocynum cannabinum L. - Indian Hemp


 

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Apocynum cannabinum - (image 1 of 7)

 

Taxonomy

Family: Apocynaceae

Habitat

Disturbance adapted. Railroads, old pastures, disturbed prairies. Dry or mesic sites.

Associates

 

Distribution

Local in eastern Canada and New England, frequent from NY west to ND, south to FL and TX. Occasional west to the Pacific.

Morphology

Colonial perennial with milky sap, 0.5 to 1.5 m. Leaves opposite, mostly ascending, petiolate, sharp-pointed. Flowers in terminal cymes surpassed by sterile lateral branches; corollas white to greenish-white, less than twice the length of the calyx lobes. Fruit a pair of many-seeded follicles; coma of seed 2 cm long or longer.

Notes

Flowers June to September

Wetland Indicator: Facultative

The stems are contain long fibers, hence the common name. Rather showy in the fall as it often turns bright yellow. Plants in this genus are highly toxic if ingested, containing a cardiac glycoside (apocynamarin) which can lead to cardiac arrest, but the plants are so bitter ingestion is unlikely.

References

Foster, S. and R.A. Caras. 1994. A Field Guide to Venomous Animals and Poisonous Plants: North America North of Mexico.

Houghton Mifflin Company. New York, NY. 244 pp.

 

Gleason, Henry A. and A. Cronquist. 1991. Manual of Vascular Plants of Northeastern United States and Adjacent Canada. Second Ed.
The New York Botanical Garden. Bronx, NY

 

Swink, F. and G. Wilhelm. 1994. Plants of the Chicago Region.
Indiana Academy of Science. The Morton Arboretum. Lisle, Illinois.

 


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Michael Hough 2004