Federal and State Listed Species of Texas:
Texas Golden Gladecress
Known only from San Augustine and Sabine counties in Texas. A population was introduced into Nacogdoches County, but was reportedly extirpated in 2011 by placement of a pipeline through the site.
Texas golden gladecress is a 10 cm tall annual with a basal rosette of leaves. The leaf blades are 3.5-5 cm long and are toothed to shallowly lobed. The middle lobe at the leaf tip is wider than long (6-7 mm long, 8-11 mm wide) and larger than the side lobes. The four egg-shaped to tongue-shaped petals are bright yellow (7.3-9 mm long, 2-3 mm wide). The pod-like fruits (1.5-2.3 cm long, 4-5 mm long) are held erect and are slightly constricted between the 5-11 circular seeds.
Texas golden gladecress is not likely to be confused with any other species.
Texas golden gladecress occurs on chalky soils over the Weches Formation in glades composed of ironstone or glauconitic (“greensand”) outcrops.
Life Cycle Events
Flowering occurs from February to May.
As an annual, Texas golden gladecress dies back soon after fruiting and re-emerges just before flowering in the early spring. The plant is most easily detected when in flower February to May.
The glade habitat Texas golden gladecress occupies can fluctuate from being inundated in the winter and spring to being droughty in the summer.This is at least in part due to the presence of glauconite in the soil, a potassium and iron-rich silicate, which has a high water holding capacity. The high fluctuation in water availability decreases the number of species, which can persist in this environment.