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These plants were found growing in thin soil over ledge with associated vegetation indicating circumneutral conditions. This image was taken during a follow up visit after initial observation in July of the same year (See https://www.inaturalist.org/observations/198391825 for images from that visit).

The brown, minutely echinate pericarp which readily separates from the slightly ovate achene, distinguishes Chenopodium foggii from C. album and other similar congeners.

Thirty-three plants were located, restricted to an area of approximately 20 sq. meters, growing in thin soil (3-5 cm) and pockets of soil, lacking leaf litter, at the base of trees and on ledges. The canopy was open with Fraxinus americana, Quercus velutina, and Ostrya virginiana growing along the periphery. Seven individuals of Chenopodium foggii were located in the opening which was dominated by Carex pensylvanica, with scattered Capnoides sempervirens, Parthenocissus inserta, Elymus hystrix, Erechtites hieracifolius, Chenopodium simplex, Dryopteris marginalis, Polygonatum pubescens, Danthonia spicata, several individuals of Geranium bicknellii and Solanum dulcamara, and a single individual of Crataegus macrocarpon. The remnants of several fallen Fraxinus americana were scattered about the opening; no evidence of emerald ash borer was observed. The remaining twenty-six plants were seen growing along the southern periphery of the opening, on ledge outcrops terraced downward to the south, with vegetation as above as well as Fallopia cilinodis, Ageratina altissima, Circaea canadensis, Polystichum acrostichoides, Maianthemum racemosum, Aquilegia canadensis, Micranthes virginiensis, and Festuca subverticillata. On the eastern periphery, ledge outcrops with a similar flora lead downward to a talus slope, although no C. foggii was observed in either of these areas.

Complete absence of dark 'tear-drop" marking under eye. Side with irregular black speckles, row of black spots midway through caudal fin. Inhabiting cold, spring-fed water (not typically inhabited by G. affinis).

Abundant in spring-fed old hatchery pond on campus. Had heard talks about this and other Gambusia species in the region at the SWAN meetings earlier in the day.

This species isn’t typically recognized from New England where it is subsumed under Carya glabra, but given the strange habitat (sandy outwash with perched water table over silt-clay glaciolacustrine sediment) and the fact that I’ve never seen a pignut like this, I’m going to throw out the C. ovalis ID, which is recognized in Weakley’s flora of the Southeast (and lists MA as the northern extent).