Please try our next iteration of the Michigan Flora Online here. Beginning on February 1, 2023, michiganflora.net will point to this new site.

The new site offers several benefits over the existing website, including real coordinate mapping, giving a clearer view of the density of documentation as well as more precision about plant distributions and their link to landforms. We will also have the ability to update species pages more regularly, both in terms of new collections and as more existing Michigan specimens are georeferenced. In addition, we have a better photo display, and offer indented keys.

This is a popular genus of cultivated plants with showy, large flowers.

1. Plants shrubby; flowers predominantly purplish (in escapes).

H. syriacus

1. Plants herbaceous; flowers yellow, white, or pink.

2. Leaf blades (at least the upper) deeply lobed to the base, glabrate or with scattered hairs beneath; calyx and bractlets with mostly long bristly hairs (especially on nerves and margins); petals ca. 1.7–2.6 cm long, yellow with purple base; capsule hairy; low, branched tap-rooted, annual weed of disturbed places.

H. trionum

2. Leaf blades more shallowly if at all lobed, in common species velvety-pubescent beneath; calyx and bractlets minutely but densely stellate-pubescent, without bristly hairs; petals ca. 4.5–8 (–9) cm long, pink (or white); capsule glabrous; erect perennials of moist ground.

3. Leaves glabrous on blades.

H. laevis

3. Leaves velvety-pubescent on blades beneath.

H. moscheutos