244-Weeds 4

Fact Sheet No. 244, UMaine Extension No. 2197


Prepared by David E. Yarborough and Timothy M. Hess, The University of Maine, Orono, ME 04469.  Replaces March 1987 by Tom DeGomez, David Yarborough and Christopher Campbell. Revised April 2002.

Choke Cherry, Prunus virginiana

Woody perennial, flowers in May.  Shrub or small tree 4’-20′ tall with dark smooth bark with white horizontal lenticels. Leaves alternate, oval to lance-shaped, bright green above, paler below and sharply toothed.  Flowers white, in dense clusters 3”-6” long.  Fruit is dark red to black.  Twigs have rank odor when crushed. Prefers moist rich soils.

Pin Cherry, Prunus pennsylvanica

Woody perennial, flowers April-June.  Small tree up 35′ tall, bark thin with horizontal, pinkish lenticels, twigs reddish brown with peeling grayish film, buds alternate and clustered at end of stem, leaves lustrous and lance to oval shaped, shiny yellow-green above and droop downward, margins finely toothed with inward teeth, leaf stalk has glands at base of leaf.  Flower white 1/2″ wide borne in roundish clusters.  Cherries red, small and sour with one large stone.

Braken Fern, Pteridium aquilinum

Perennial, reproduces by spores and creeping rhizomes (some up to 18′ long).  Rigid leaf stalk 1′-3′ long, and swollen at base, leaf blades 2′-4′ long and 1′-3′ wide, triangular to oval shaped with or without hairs on the underside, spores in light brown masses on the underside of the leaf blade.

Interrupted Fern, Osmuda claytoniana

Perennial, herbaceous, reproduces by spores and creeping rootstocks.  Leaves 2′-6′ long, covered with densely matted wool-like hairs when young, leaf blades oblong to lance-shaped 1′-4′ long.  Spores borne on non-leafy stalks, mid-way up interrupting leaf blade, greenish at first, becoming dark brown and brittle with age.

Interrupted Fern
Figure 7: Interrupted Fern

Hay-scented Fern, Dennstaedtia unctilobula

Perennial, herbaceous, reproduces by spores and rhizomes.  Rhizomes slender and extensive, leaf stalk stout, 1′-3′ long with lanceolate blades 5″-9″ wide, oval to lance-shaped with sporangia (spore cups) on leaf margins, apically thickened veins do not reach leaflet end, sweet-scented when crushed, rhizomes spite and frond with spreading glandular hairs.


Information in this publication is provided purely for educational purposes. No responsibility is assumed for any problems associated with the use of products or services mentioned. No endorsement of products or companies is intended, nor is criticism of unnamed products or companies implied.

© 1987, 2002

Call 800.287.0274 (in Maine), or 207.581.3188, for information on publications and program offerings from University of Maine Cooperative Extension, or visit extension.umaine.edu.

The University of Maine is an EEO/AA employer, and does not discriminate on the grounds of race, color, religion, sex, sexual orientation, transgender status, gender expression, national origin, citizenship status, age, disability, genetic information or veteran’s status in employment, education, and all other programs and activities. The following person has been designated to handle inquiries regarding non-discrimination policies: Sarah E. Harebo, Director of Equal Opportunity, 101 North Stevens Hall, University of Maine, Orono, ME  04469-5754, 207.581.1226, TTY 711 (Maine Relay System).