|Photo taken by Gil Nelson|
|Division:||Magnoliophyta - Flowering plants|
|Class:||Magnoliopsida – Dicotyledons|
|Family:||Clusiaceae ⁄ Guttiferae|
| Hypericum tetrapetalum|
|Natural range of Hypericum tetrapetalum from USDA NRCS Plants Database.|
Common name: Fourpetal St. John's-wort
Synonym: Ascyrum tetrapetalum (Lamarck) Vail
“Usually glabrous herbs or shrubs. Leaves usually punctate, simple, opposite, entire, usually sessile or subsessile, exstipulate. Inflorescence basically cymose; flowers perfect, regular, bracteates, subsessile or short-pedicellate, sepals 2, 4, or 5, persistent; petals 4 or 5, usually marcescent, yellow or pink; stamens 5-numerous, separate or connate basally forming 3-5 clusters or fascicles, filaments usually persistent; carpels 2-5, stigmas and styles separate or fused, ovary superior, 1-locular or partly or wholly 2-5 locular, placentation axile or parietal. Capsules basically ovoid, longitudinally dehiscent, styles usually persistent; seeds numerous, lustrous, areolate, cylindric or oblong. In general our species form a polymorphic complex with many intergrading taxa.” 
H. tetrapetalum occurs in wet sandy soils, like those of wetland woodlands, mesic flatwoods, or the margins of Karst ponds.  It can also occur in disturbed areas like roadsides.  Associated species include Pinus palutris, Hypericum microsepalum, and Serenoa repens.  Also include gallberry. 
This species is recorded in the FSU Herbarium specimens as flowering in August, but in peninsular Florida it can bloom throughout the year. In north Florida H. tetrapetalum has been observed flowering in July and December.
The following Hymenoptera families and species were observed visiting flowers of Hypericum tetrapetalum at Archbold Biological Station: 
Halictidae: Augochlorella aurata, Augochloropsis metallica, Lasioglossum coreopsis, L. miniatulus
Megachilidae: Megachile brevis pseudobrevis
Use by animals
Deyrup observed these bees on, but not necessarily pollinating, H. tetrapetalum: Augochlorella aurata, Dialictzcs coreopsis, D. lniniatulusi.
Conservation and management
Cultivation and restoration
References and notes
- Florida State University Robert K. Godfrey Herbarium database. URL: http://herbarium.bio.fsu.edu. Last accessed: June 2014. Collectors: R. A. Norris, Robert K. Godfrey, Steve L. Orzell, and Cecil R Slaughter. States and Counties: Florida: Alachua, Leon, Osceola, and Wakulla. Georgia: Camden and Clinch.
- Radford, Albert E., Harry E. Ahles, and C. Ritchie Bell. Manual of the Vascular Flora of the Carolinas. 1964, 1968. The University of North Carolina Press. 709. Print.
- Jason Sharp post to Florida Botany with image of flowering plant, 1 FEB 2016
- Nelson, G. PanFlora: Plant data for the eastern United States with emphasis on the Southeastern Coastal Plains, Florida, and the Florida Panhandle. www.gilnelson.com/PanFlora/ Accessed: 12 DEC 2016
- Deyrup, M.A. and N.D. 2015. Database of observations of Hymenoptera visitations to flowers of plants on Archbold Biological Station, Florida, USA.
- Deyrup, M. J. E., and Beth Norden (2002). "The diversity and floral hosts of bees at the Archbold Biological Station, Florida (Hymenoptera: Apoidea)." Insecta mundi 16(1-3).