Euphorbia aeruginosa

Euphorbia aeruginosa Schweick.

Kingdom	Plantae	Plants, but not fungi, lichens, or algae
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	Malpighiales	A broad group encompassing 16,000 species
Family	Euphorbiaceae	Euphorbia or spurge family
Genus	Euphorbia	An extremely diverse-looking genus of mostly tropical and subtropical succulent plants. For Euphorbus, corpulent Greek physician of Juba II, King of Mauretania. Literally, “euphorbia” means “well-fed”
Species	aeruginosa	From Latin aerūgō, “[blue green] rust of copper, verdigris,” and‎ -ōsus.

About plant names...

This euphorbia is a South African native, not found in the wild in North America.

Identification: Plants are up to 12" (30 cm) in height, with blue-green stems that are roughly square in cross-section and about ⅜" (1 cm) on a side. Spine groups appear along the edges of the stems; spines are dark orange-brown and about ⅜" (1 cm) in length. Flowers are small bright yellow cyathia, appearing near the stem tips.

Online References:

Euphorbia aeruginosa on CactiGuide.com

Euphorbia aeruginosa on Cal Lamke's Cal's Plant of the Week, at the University of Oklahoma's Department of Botany and Microbiology

Euphorbia aeruginosa on Desert-tropicals.com

Euphorbia aeruginosa at the University of Connecticut Ecology and Evolutionary Biology Plant Growth Facilities

Euphorbia aeruginosa on www6.saylorplants.com

Euphorbia aeruginosa description by Thomas H. Kent, last updated 25 May 2020.

4/6/2011 · Howard Peters Rawlings Conservatory & Botanic Gardens, Druid Hill Park, Baltimore, MD
≈ 12 × 17" (29 × 44 cm)

Range: Zones 10-11:

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