Euphorbia rosescens

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Euphorbia rosescens
Euph rose.jpg
Photo by Spencer Bissett, Atlas of Florida Vascular Plants
Scientific classification
Kingdom: Plantae
Division: Magnoliophyta - Flowering plants
Class: Magnoliopsida - Dicotyledons
Order: Euphorbiales
Family: Euphorbiaceae
Genus: Euphorbia
Species: E. rosescens
Binomial name
Euphorbia rosescens
E.L.Bridges & Orzell
Euph rose dist.jpg
Natural range of Euphorbia rosescens from USDA NRCS Plants Database.

Common name: Scrub spurge

Taxonomic notes

Distinguishable from Euphorbia floridana by broader stem leaves that are not reflexed and do not abruptly contrast with ovate bracteal leaves on the inflorescence.[1]

Description

Euphorbia rosescens is a slightly succently, blue-green herb[1] and is often a single stem and can be seen growing in clusters.[2] The leaves are elliptic to oblanceolate or obovate-spatulate.[1] Flowers are unisexual and occur in cyathia that develop acropetally and are arranged on a compound inflorescense.[2]

Distribution

Distribution is limited to a 50 kilometer range on the well drained sands of the Lake Wales Ridge.[3] There are fewer than 20 known sites.[4]

Ecology

Habitat

Habitat is limited to the xeric, white sand entisols of the Lake Wales Ridge. Within the ridge, it can be found in sand pine scrubs, scrubby flatwoods, and disturbed areas along sandy roads and fire breaks.[2] It has been observed to tolerate some disturbance.[4]

Phenology

The flowers of E. rosescens are unisexual and occur within cyathia that develop acropetally, arranged on a compound inflorescense.[2]

Pollination

The following Hymenoptera families and species were observed visiting flowers of Euphorbia rosescens at Archbold Biological Station: [5]

Sphecidae: Bembecinus nanus floridanus, Tachysphex apicalis, T. similis, Tachytes mergus

Vespidae: Leptochilus krombeini

Conservation and management

Range is limited to Highlands county on the Lake Wales Ridge, and there are fewer than 20 known sites. The ridge is quickly being converted into agricultural lands and urban development. The existing scrubs are becoming overgrown with fire suppression.[4] Archbold currently monitors this species.[6]

G1-critically imperiled.[4]

Cultivation and restoration

Photo Gallery

References and notes

  1. 1.0 1.1 1.2 [NatureServe]Accessed: December 11, 2015
  2. 2.0 2.1 2.2 2.3 [Archbold Biological Station] Accessed: December 11, 2015
  3. [[1]]Accessed: December 11, 2015
  4. 4.0 4.1 4.2 4.3 [Encyclopedia of Life]Accessed: December 11, 2015
  5. Deyrup, M.A. and N.D. 2015. Database of observations of Hymenoptera visitations to flowers of plants on Archbold Biological Station, Florida, USA.
  6. [[2]] Accessed: December 11, 2015