Cistaceae

1. Plant a low shrub with scale-like, overlapping, closely appressed leaves; style distinctly longer than the ovary.

Hudsonia

1. Plant an erect herb with flat linear to narrowly elliptic leaves that expose the stem; style (if any) shorter than the ovary.

2. Petals 5, yellow, showy but readily falling (or absent in cleistogamous flowers); stigma on a distinct style; leaves with stellate hairs.

Crocanthemum

2. Petals 3, reddish, seldom expanded, mostly concealed by the sepals (cleistogamous flowers none); stigmas sessile or nearly so; leaves glabrate or with simple hairs.

Lechea

Citation:

MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. November 20, 2017. http://michiganflora.net/family.aspx?id=Cistaceae.