Flower:

5 to 30 stalked dandelion-like flowers, ¾ to 1 inch wide in an open or flattened cluster at the top of the stem. Sometimes flowers are single. Flower stalks are covered in fine short hairs, though larger, longer hairs, sometimes black and glandular, can be scattered up onto the bracts. Bracts are narrow, overlapping scales often with the tips spreading out.

Leaves and stems:

Leaves are 1 to 5 inches long, ¼ to 1½ inches wide, lance-elliptic, stalkless but not (usually) clasping, pointed at the tip, becoming smaller as they ascend the stem. Around the edges are usually a few widely spaced teeth or tooth-like projections and very short rough hairs; the surface is usually rough textured. Often tinged with red, lower stem may be finely hairy or smooth, waxy in part, hairs becoming short and fine towards the tips.

Fruit:

Fruit is a dry seed that ripens to black, with a tuft of light brown hair to carry it off in the wind.

Notes:

Widespread in all but the southwest prairie regions, Narrow-leaf Hawkweed was once classified in Minnesota as two separate species, Hieracium kalmii and H. scabriusculum, which are still recognized in other texts and resources, Very similar in appearance all are presently lumped under H. umbellatum in Bell herbarium records. Not to be confused with the several non-native hawkweeds, H. umbellatum has leafier stems up to the flower cluster and the only hawkweed with lance-elliptic leaves with roughly hairy, sharp toothed edges. Sometimes this species also goes by H. canadense, listed as a synonym for H. kalmii, commonly called Canada Hawkweed.