DYC var of Helianthus grosseserratus,
These were growing near a good sized patch of Symphyotrichum firmum and were up on the bottom of the esker before sunken creek fen.begins(aka edge of the fen.) These had the best example of how dense the frimbrate-ciliate hairs along the involucre bracts ( Phyllaries) can be on this species. The capitulum spacing through me off though, it was also lacking totally conduplicate leaf function; the leaves still connected near sessile(attached directly) and recurved( bending up instead of reflexed which means bending down) up and out from the stem, the leaves them selves had finely serrate(minutely dentate saw-like) margins, lanceolate, and scabrid (rough) texture. Normally on this species, capitulescence is in direct with the cauline leaves and rarely branches, here we have less capitulum on capitulescence and some splitting. Which doesn’t really do to much good for the botanist without key in the field in satisfying instant id gratification.
btw DYC stands for Damn Yellow Composit flower.
This is MI flora’s key text :
“ Heads at least 4 cm broad, the disk ca. 1.5–2.3 cm broad and the rays ca. 1.8–4.3 cm long.14. Leaves only slightly scabrous to the touch above (the tiny pustulate-based projections appressed), usually not over 3 (rarely to 5.5) cm broad, the blades ca. 4–8 times as long as broad, alternate on upper part of stem.”
“Moist places, including swamps and marsh borders; disturbed sites, railroad yards. Near the edge of its range in southern Michigan, and much less common here than its close relative, H. giganteus, with which it hybridizes (see that species).Locations“
“This is a notoriously difficult genus native to North America, with hybridization obscuring the differences between a number of species. Some specimens will not work in this (or any other) key. Incomplete specimens (e.g., lacking basal parts or adequate notes on the label) are often not satisfactory for identification.
Many characters used in this genus (at least in the key) are difficult to apply in the absence of both options before the user. Experience with the genus will help to interpret such non-quantitative terms as “densely” pubescent or “nearly” glabrous stems. It is usually best to judge stem pubescence at the middle of the stem. Some species or individuals with hairy stems may have them glabrous toward the base (or even merely harsh, from persistent bases of worn-off hairs, at the middle); and some with stems glabrous at the middle may have short, usually antrorse, hairs toward the summit and on branches of the inflorescence. Even defining (and thus measuring) a petiole can be puzzling, as it is usual for at least a narrow strip of green leaf tissue to border the petiole on each side, making it “winged.” We have considered the distal end of the petiole to be where the blade ± abruptly expands and the sides of the winged petiole are therefore no longer nearly parallel.In several species some of the upper leaves are usually or consistently alternate, perhaps 2 leaves or perhaps all but the lowermost 2 or 3 pairs. Depauperate plants (e.g., in H. annuus) tend to have more opposite leaves as well as appearing quite different from plants grown under optimal conditions. Leaves in some species (e.g., H. giganteus, H. strumosus, H. tuberosus) may have scattered to dense glandular dots beneath. Some species thrive in moist ground and others on dry sites, but most at least tolerate a wide range of habitat and readily spread into disturbed sites.“
This Helianthus spp. group is also underfunded for Herbarium specimen and lab specimen research on hybrids. So this may be a hybrid, with one parent being sawtooth sunflower and the other as a UNID.