Where is Comanche Peak Prairie-clover (Dalea reverchonii)
located in the wild?
Shallow calcareous clay to sandy clay soils over limestone in grasslands or openings in post oak woodlands, often among sparse vegetation in barren exposed sites. Most known sites are underlain by WalnutLimestone, a Cretaceous formation. Dalea reverchonii is a calciphile, known to grow only on rocky limestone substrate Cretaceous in age. Mahler (1984) described the habitat as thin soil overlying limestone rock. Orzell (1987) noted that plants were found growing on a nearly flat Goodland Limestone (Cretaceous Age) Glade surrounded by shrub thickets (Orzell 5581, TEX). O'Kennon (2010) and Swadek and Burgess (2012) disagreed on the type of geology, noting that the species is restricted to Walnut Limestone glades. Much of the Walnut (Kwa) and Goodland (Kgl) limestones are mapped as undivided units (i.e. Kgw), possibly leading to the uncertainty in geology. Comanche Peak, the type locality for the species, is topped with Edwards Limestone (Ked). Dalea reverchonii has only been collected in limestone substrate on what have been termed limestone glades by Swadek and Burgess (2012). These glades consist of little to no soil overtopping limestone bedrock. Dalea reverchonii appears restricted to crevices in exposed limestone bedrock, very shallow soils over bedrock, or Walnut marl where the shell hash has been removed. The roots are embedded in the Walnut marl directly below the indurate Texigryphaea mucronata shell hash. The plant was rarely seen where vegetative cover is taller and denser, which seems to be associated with deeper soils overlying the limestone.
This species is endemic to north-central Texas in the Fort Worth Prairie and Lampasas Cut Plain level III Ecoregions in Hood, Parker, Wise, Bosque, Erath, Johnson, Somervell, and Tarrant counties (Taylor & O'Kennon 2013).
States & Provinces:
Comanche Peak Prairie-clover can be found in Texas