| Family | Scientific Name | Common Name | Habitat | Distribution | Image |
|---|---|---|---|---|---|
| Pteridaceae | Pellaea atropurpurea | Purple Cliff-brake | Outcrops of limestone and other rocks (usually either calcareous, subcalcareous, or mafic), rarely on masonry walls (Wieboldt 1995). | Widespread in e. North America, from NH, VT, NY, MN, SD, SK, and AB south to Panhandle FL, AL, TN, AR, TX, NM, AZ, Mexico, and Guatemala. |  |
| Pteridaceae | Pellaea glabella ssp. glabella | Smooth Cliff-brake | Dry, exposed outcrops of calcareous rocks (limestone, dolostone), rarely on masonry walls (Wieboldt 1995). | The diploid, sexually-reproducing P. glabella ssp. missouriensis (Gastony) Windham is (so far as is known) restricted to MO; the apogamously-reproducing autotetraploid derivative, ssp. glabella, is more widespread, ranging from VT, ONT, and MN, south to VA, TN, ne. AL (Barger et al. (2019), KY, AR, OK, and n. TX. |  |
| Pteridaceae | Pellaea glabella ssp. missouriensis | Limestone and dolomite bluffs. | Endemic to the MO Ozarks (as far as is known). | ||
| Pteridaceae | Pellaea ovata | Zigzag Cliff-brake | Rocky slopes, ledges, on calcareous and other rocks. | TX south into Mexico, Central America, and South America; West Indies (Hispaniola). |  |
| Pteridaceae | Pellaea ternifolia ssp. arizonica | Arizona Cliff-brake | On granitic outcrops. | A remarkable disjunct from sw. United States and Mexico (south to Oaxaca) to w. SC; see Heafner (2001) for additional information. When discovered, it was believed that the SC site was a state record for P. wrightiana (Platt & Townsend 1996), but Heafner (2001) has demonstrated that the station actually represents P. ternifolia ssp. arizonica. |  |
| Pteridaceae | Pellaea wrightiana | Wright's Cliff-brake | In crevices or soil mats over various acidic to slightly basic rocks; eastwards on open to shaded outcrops of Carolina slate, "rich" granitic rock, gneiss, and other rock types. | Sw. AR (Ouachita Mountains; T. Witsell, pers. comm.) and OK west to se. CO and sw. UT, south to TX, AZ, and n. Mexico (COA, CHH, SON, BCN, and BCS), with a few, remarkable disjunct occurrences in c. NC (Wagner 1965; Heafner 2001) and w. SC (McMillan et al. 2018). |  |
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