Oenothera pilosella (Prairie sundrops)

8/28/2016 · Groton Hills Conservation Area and Sawtell Conservation Area, Groton, Massachusetts

9/14/2009 · Near Nashoba Hospital, Ayer, Massachusetts · ≈ 12 × 8″ (31 × 20 cm) ID is uncertain

9/14/2009 · Near Nashoba Hospital, Ayer, Massachusetts · ≈ 9 × 14″ (23 × 35 cm) ID is uncertain

Kingdom	Plantae	Plants, but not fungi, lichens, or algae (from Stearn's Botanical Latin)
Subkingdom	Tracheobionta	Vascular plants—plants with a “circulatory system” for delivering water and nutrients
Division	Magnoliophyta	Flowering plants, also known as angiosperms
Class	Magnoliopsida	Dicotyledons—plants with two initial seed leaves
Subclass	Rosidae	Roses, legumes, proteas, dogwoods, hydrangeas, mistletoes, euphorbias, grapes, many more
Order	Myrtales	Includes myrtles, leadwoods, loosestrifes, pomegranates, evening primroses, many others
Family	Onagraceae	Willowherb/evening primrose family
Genus	Oenothera	Derivation uncertain: 1. Greek ονος θηρας (onos theras), or “donkey catcher.” 2. Or οινος θηρας (oinos theras), “wine seeker.” 3. Or Latin oenothera, “a plant whose juices may cause sleep”
Species	pilosella