Bastard pennyroyal (Trichostema dichotomum) in Little Lake Creek Loop Trail in Sam Houston National Forest. Richards, Texas, October 2, 2010
Bastard pennyroyal (Trichostema dichotomum) in Lick Creek Park. College Station, Texas, September 30, 2009
Tiny blue flowers of false pennyroyal (pennyroyal bluecurls, fluxweed, Trichostema brachiatum) on Moore s Hill Outcrop at FM Road 3090 near Navasota. Texas, September 23, 2012
Bastard pennyroyal (Trichostema dichotomum) in Lick Creek Park, on sewage line right of way. College Station, September 17, 2008
Blue flowers with coiled stamens of Bastard pennyroyal (Trichostema dichotomum) on Little Lake Creek Loop Trail in Sam Houston National Forest. Huntsville, Texas, September 14, 2008
Bastard pennyroyal (Trichostema dichotomum) in Lick Creek Park. College Station, Texas, September 24, 2012
Reverchon s false pennyroyal (Hedeoma reverchonii) in Moore s Hill Outcrop at FM Road 3090 near Navasota. Texas, July 1, 2012
Blue flowers of bastard pennyroyal in Lick Creek Park. College Station, Texas, September 30, 2008
Bastard pennyroyal on sewage line right of way in Lick Creek Park. College Station, Texas, September 23, 2008
Flowers of bastard pennyroyal (Trichostema dichotomum) in Lick Creek Park. College Station, Texas, September 24, 2012
Bastard pennyroyal (Trichostema dichotomum) in Lick Creek Park. College Station, Texas, October 11, 2012
Blooming bastard pennyroyal (Trichostema dichotomum) in Lick Creek Park. College Station, Texas, October 11, 2012
Reverchon s false pennyroyal (Hedeoma reverchonii) on Moore s Hill Outcrop at FM Road 3090 near Navasota. Texas, May 23, 2010
Back lit flowers of bastard pennyroyal (Trichostema dichotomum) in Lick Creek Park. College Station, Texas, October 11, 2012
Flowers of bastard pennyroyal (Trichostema dichotomum) in Lick Creek Park. College Station, Texas, October 11, 2012
Bastard pennyroyal (Trichostema dichotomum) in Lick Creek Park. College Station, Texas, October 9, 2012
Close up of flowers of bastard pennyroyal (Trichostema dichotomum) in Lick Creek Park. College Station, Texas, October 11, 2012
Reverchon s false pennyroyal (Hedeoma reverchonii) on sandstone cliffs of Moore s Hill Outcrop at FM Road 3090 2 miles north-east from Navasota. Texas, September 22, 2019
Reverchon s false pennyroyal (Hedeoma reverchonii) on Moore s Hill Outcrop at FM Road 3090 2 miles north-east from Navasota. Texas, May 24, 2020
Fruits of bastard pennyroyal (Trichostema dichotomum) on Stubblefield section of Lone Star hiking trail north from Trailhead No. 6 in Sam Houston National Forest. Texas, October 1, 2020
Bastard pennyroyal (Trichostema dichotomum) on Stubblefield section of Lone Star hiking trail north from Trailhead No. 6 in Sam Houston National Forest. Texas, October 1, 2020
Seeds of bastard pennyroyal (Trichostema dichotomum) on Richards Loop Trail in Sam Houston National Forest. Texas, November 5, 2020
Bastard pennyroyal (Trichostema dichotomum) in Lick Creek Park. College Station, Texas, September 9, 2021
Reverchon s false pennyroyal (Hedeoma reverchonii) on Moore s Hill Outcrop at FM Road 3090 near Navasota. Texas, April 17, 2022
Bastard pennyroyal (Trichostema dichotomum) in Lick Creek Park. College Station, Texas, September 26, 2022
Flower of bastard pennyroyal (Trichostema dichotomum) when exposed to regular daylight as well as when illuminated by a 365 nm ultraviolet (UV-A) blacklight from Lick Creek Park. College Station, Texas, September 17, 2024
Blooming bastard pennyroyal (Trichostema dichotomum) when exposed to regular daylight as well as when illuminated by a 365 nm ultraviolet (UV-A) blacklight from Lick Creek Park. College Station, Texas, September 17, 2024
Flowers of bastard pennyroyal (Trichostema dichotomum) both in natural light and under 365 nm ultraviolet (UV-A) blacklight from Lick Creek Park. College Station, Texas, September 17, 2024
Bastard pennyroyal (Trichostema dichotomum) when exposed to regular daylight as well as when illuminated by a 365 nm ultraviolet (UV-A) blacklight from Lick Creek Park. College Station, Texas, September 17, 2024
Bastard pennyroyal (Trichostema dichotomum) when exposed to regular daylight as well as when illuminated by a 365 nm ultraviolet (UV-A) blacklight from Lick Creek Park. College Station, Texas, October 1, 2024
Blooming bastard pennyroyal (Trichostema dichotomum) both in natural light and under 365 nm ultraviolet (UV-A) blacklight from Lick Creek Park. College Station, Texas, October 1, 2024
Rough False Pennyroyal (Hedeoma hispida) both in natural light and under 365 nm ultraviolet (UV-A) blacklight collected on a lawn at crossing of Holleman Drive and Dartmouth Street. College Station, Texas, April 30, 2026
This composite image documents four stems of Hedeoma hispida (Rough False Pennyroyal) demonstrating the plant s appearance under two different lighting conditions against a dark background. The top panel shows the specimens under standard white light. The stems feature opposite, linear leaves and are covered in fine, bristly hairs, giving the plant its "rough" descriptor. Clusters of tiny, tubular, purplish-blue flowers emerge from the leaf axils along the upper portions of the stems, nestled within spiky, bristly calyces. The overall coloration is a vibrant, natural green with delicate violet floral accents. The bottom panel reveals the same four specimens illuminated by a 365 nm ultraviolet (UV-A) blacklight. Under UV excitation, the plant exhibits striking fluorescence. The previously purplish-blue flowers fluoresce a brilliant, vivid pinkish-red, while the green stems, leaves, and bristly hairs emit a cool, icy blue-white glow. This stark contrast highlights the complex photochemical properties of the plant tissues, transforming the subtle daytime appearance into a dramatic, high-contrast display. College Station, Texas, April 30, 2026 Blooming Rough False Pennyroyal (Hedeoma hispida) both in natural light and under 365 nm ultraviolet (UV-A) blacklight collected on a lawn at crossing of Holleman Drive and Dartmouth Street. College Station, Texas, April 30, 2026
