They are blooming now here in Ontario.
Blloming season for acaule is typically early June to early July (with exceptions due to local conditions).
I often find them in close promimity to cyp reg. and cyp parvi pub populations.
I agree w John re nomenclature.
...they are definitely pubescens.
I have parvi's and the plants are about 50-70% of the size of pubuscens and the lateral petals are the colour of chocolate milk.
I've been using residential dehumifier water every other watering for severl years.
I dilute this water 50:50 with rain or municipal water without any apparent ill affect.