Favoritos de derekstephenhollingshead

ID based on what this population was ID'd as in Herbarium data. Growing on a sandy ridge. Cemetery just north, corn field bordering. Population seems to get partially run over by farm equipment. Herbarium data suggests that this population may hybridize with O. cymochila which apparently had been planted in cemetery. The introgression seems apparent in one section of population.

An extra-spiny variant found in the El Paso / Juarez area that may deserve varietal distinction.

Fruits, all from one plant, showing some of the variation possible even on one individual in one season.

Tiny population of three mature plants with minimal recruitment (found two juvenile plants). Habitat is the stabilized mossy edge of a small blowout in a fantastic sand prairie at the southeast-sloping base of a gravel esker. Note the recently acquired fire damage from a controlled burn. Associates include indicators of high quality dry sand prairie such as Nuttalanthus canadensis, Viola pedatifida, Artemisia campestris, Helianthus occidentalis, Koeleria macrantha, and Dichanthelium praecocius.

The opinion of Opuntia experts on this population seems to have converged on O. cymochila. Here’s what I noticed vs. Lower Wisconsin River Valley populations: More spines per areole, the largest of which tend to be either yellow or reddish at base compared to brownish or grayish throughout, and more reflexed; different pad shape, with cuneate bases and a broad apex, resulting in a somewhat triangular shape; and very dense yellow glochids which seem much longer and sturdier than “typical” O. macrorhiza. I will say this also does not look like a perfect match for typical O. cymochila, either. To my untrained eye that species tends to have spines on more of the surface of its cladodes rather than just the apical 1/2 or so. I tried to document these plants pretty well so hopefully I didn’t miss any important characters.

Calling all the Opuntia people… @aidancampos, @derekstephenhollingshead, @davidferguson etc.

Woody dominants included Juniperus virginiana, Carya ovata, and Quercus stellata. Other woody species included Chionanthus virginicus and Viburum prunifolium. Schizachyrium scoparium is the dominant herbaceous species mixed with a diversity of species including Muhlenbergia capillaris, Andropogon gerardii, Pycnanthemum tenuifolium, Ruellia purshiana, Phemeranthus teretifolius, Chionanthus americana, Sorghastrum nutans, Penstemon canescens, Elymus hystrix, Dichanthelium linearifolium, Stylosanthes biflora, Campanula divaricata, Muhlenbergia tenuiflora, Carex pennsylvanica, Allium cernuum, Sisyrinchium sp., Calystegia spithamaea, Helianthus decapetalus, Scleria oligantha, Packera paupercula, Euphorbia cf corollata, Myriopteris lanosa, Myriopteris tomentosa, Asclepias verticillata, Agalinis sp., and Oenothera tetragona.