Botany 620 - Field Trip Log
Washington on the Brazos State Park/Moore's Hill
16 April 1996

Our visit to Washington on the Brazos State Park covered a small, but diverse, area between the parking lot and river overlook (select image or larger map of the park). Of the many taxa encountered, intra-population variation in corolla coloration was most evident in the large population of Phlox drummondii inhabiting the sandy hillside above the amphitheater. These plants (below) can be assigned to the 'variable' var. peregrina which, according to Correll and Johnston, represents an escaped cultivar, possibly the product of dispersal via the Texas Department of Highways. A check of the BONAP treatment reveals that this variety is placed as a synonym with ssp. drummondii, a default indication that domesticated elements of this species are derived from the typical taxon.

Human influence may also be indicated by the presence of two Lupinus species in the park. Quite common along the path is L. texensis which is well marked by its whitish infloresence tips and non-inflated wing petals. This species forms pure, native stands in blackland prairie habitat just northwest of the park. It is also planted by the Texas Highway Department along major roadsides in the area. More common, with Phlox drummondii, on the sandy slopes above the amphitheater, is Lupinus subcarnosus, well marked at a distance by its continuous blue inflorescences (no whitist tip) and inflated or 'cheeky' wing petals.

This trip also involved a visit to the sandstone outcrop at Moore's Hill, just just northeast of Navasota in Grimes County. Of the many interesting taxa in flower, we - as is often the case at this site - ran across something new.


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Created on 29 April 1996