After missing the last three weeks, I was happy to rejoin the WGNSS botanists on their regular weekly outing this past Monday. This week’s destination—Salt Lick Point Land & Water Reserve in western Monroe Co., Illinois—features a mosaic of loess hill prairie and limestone glades amidst dry to dry-mesic upland forest atop limestone bluffs towering up to 400 feet above the Mississippi River valley below.
It has been an exceptionally dry August and September, so much that fall blooming plants are noticeably delayed and sparse in their blooms. Nevertheless, welcome rains just in the past few days have breathed some “fall life” into the woods and brought with them the pungent, earthy aromas that one expects to accompany a landscaping morphing from the dull greens of summer to the vibrant ambers, tawnies, and golds of fall.
The group first explored the upland and blufftop habitats along the challenging terrain of the Salt Lick and Newman Trails, then returned through flat lowlands along the bluff bottoms via the Johnson Trail. Although still just beginning to bloom, a diverse palette of “fall asters” gave us an opportunity to reacquaint ourselves with the characters that distinguish these often “easy-to-identify-to-genus but difficult-to-identify-to-species” plants. The bulk of these fell into one of two groups—the true asters (genus Symphyotrichum) and the goldenrods (genus Solidago).
Symphyotrichum patens (late purple aster) was the first true aster that we noticed, a rather common species distinguished by its purple (of course) flowers with loose but not recurved phyllaries and leaves broadly clasping the stem. It wasn’t long before we had a chance to test our knowledge when we encountered the similar appearing Symphyotrichum anomalum (manyray aster), also with purple flowers but distinguished from S. patens by its distinctly recurved phyllaries and petiolate rather than clasping leaves. Eventually, we would encounter a third species of the genus—Symphyotrichum lateriflorum (calico aster), distinguished by its numerous small white flowers at the tips of numerous lateral branches rather than the terminus of the stem.
Goldenrods, on the other hand, were not only more diverse but also comprised some quite conservative species. The first of these was Solidago drummondii (Drummond’s goldenrod). This near-endemic species is restricted to eastern Missouri and adjacent parts of Illinois and Arkansas and grows almost exclusively on limestone or dolomite bluffs. However, we found it growing on limestone boulders placed at the trailhead next to the parking lot. Its wide, toothed leaves on short petioles (along with habitat) make this species easy to identify. Another quite conservative goldenrod was found as we entered the dry to dry-mesic forest further up the trail—Solidago buckleyi (Buckley’s goldenrod). Restricted to the Ozarks and adjacent areas, it is a showy species with relatively large flowers and spready phyllaries. In this and other respects, it greatly resembles the much more common Soldago petiolaris (downy goldenrod); however, it differs from that species by its narrower leaves that lack distinct teeth. A third species was seen as we approached one of the larger loess hilltop prairie remnants—Solidago altissima (tall goldenrod). Unlike the previous two species, this is one of the commonest and weediest species of goldenrod in the region. Relatively tall and with pyramidal inflorescences, this species often aggressively monopolizes roadsides and fallow fields. It greatly resembles another fairly common species—Solidago gigantea (late goldenrod), which we would later see during the return hike along the edge of the river valley. Leaf texture, however, differs between these two species—S. altissima has leaves with rough surfaces (caused by stiff, unidirectionally recurved hairs that cause the leaf to move only one direction when rubbed between the thumb and forefinger), while S. gigantea has smooth leaves (that move in any direction when rubbed).
The group not only spent its time with its eyes down, but also out—across the vast Mississippi River valley spread out below the several lookout points dotting the trails. Tawny fields of near-ready-to-harvest corn provided a beautiful backdrop against the resplendent red sumacs and brilliant orange maples lining the blufftops.
As the group’s lone entomologist/botanist (“entomotanist”?), I also kept an eye out for insects and was richly rewarded. A tiny “thorn” on the stem of S. buckleyi proved to be Enchenopa latipes (wide-footed treehopper), and unfolding the “folded” leaves of Cercis canadensis (eastern redbud) revealed the culprits—zebra-striped caterpillars of Fascista cercerisella (redbud leaffolder moth).
A spectacular earth boring beetle, Geotrupes splendidus, was seen lumbering clumsily along the trail in its endless quest for mammal dung to bury and lay an egg upon, while Bombus impatiens (common eastern bumble bee) worked the flowers of Eupatorium altissimum (tall boneset) and Eupatorium serotinum (late boneset).
A nearly mature Euchaetes egle (milkweed tussock moth) consumed the dwindling foliage of Cynanchum laeve (climbing milkweed), and Piezogaster calcarator (leaf-footed bugs) congregated on the inflorescences of Verbesina alternifolia (yellow ironweed).
Nowhere, however, was insect activity more abundant than on the goldenrods, particularly the abundant stands of S. altissima in the uplands and S. gigantea below. Overwhelming numbers of Chauliognathus pennsylvanicus (goldenrod soldier beetles) and Lycomorpha pholus (black and yellow lichen moths) were accompanied by a cacophony of bees, wasps, and flies—a situation tailor made for Phymata sp. (jagged ambush bugs) to lay in wait while Epargyreus clarus (silver-spotted skipper) flew erratically overhead.
Even in the deeply shaded mesic forest, Cyllopsis gemma (eastern gemmed satyrs) flitted deftly through the undergrowth.
The most unusual find, however, was a bizarre, green, jewel of a caterpillar found crawling on the forest floor—Isa textula (crowned slug moth or skiff moth), fringed with lacy projections that make it look more like a sea slug than an insect!
Of course, a Monday WGNSS Botany Group outing isn’t truly consummated until it has enjoyed lunch at a local establishment—the choice this time being Tequila Mexican Restaurant in nearby Waterloo (best fish tacos I’ve ever had!).
©️ Ted C. MacRae 2025
Beetles In The Bush 