Euphorbia ‘Blackbird’
Blackbird spurge
This cultivar, a cross of another cultivar of Martin’s spurge (Euphorbia × martinii ‘Nothowlee’), has deep purple leaves and chartreuse flowers. (Martin’s spurge itself, Euphorbia × martinii, is a natural hybrid, first discovered in southern France in the late 1800s.)
Plants: Dwarf evergreen subshrubs are 12–24″ high ⨉ 1½–2′ around (30–60 ⨉ 45–60 cm).
Leaves: Lanceolate, bright red at first, darkening to deep purple in strong sunlight.
Flowers: Numerous chartreuse-colored flowers usually have purple centers.
Fruits: ?
Habitats: Hot dry tropical climates.
Edibility: Poisonous 
. All parts of the plant are
toxic. The milky sap can cause a contact dermatitis.
Online References:
North Carolina Extension Gardener Plant Toolbox (Euphorbia × martinii)
Euphorbia ⨉ martinii ‘Nothowlee’
2/24/2010 · San Diego (Quail) Botanic Garden, Encinitas, California · ≈ 1½ × 1½′ (45 × 49 cm) 
2/24/2010 · San Diego (Quail) Botanic Garden, Encinitas, California · ≈ 1½ × 1′ (42 × 39 cm) 
| 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 | 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” |
Euphorbia ‘Blackbird’ description by Thomas H. Kent, not updated.
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