Euphorbia amygdaloides

Pictured are the terminal cymes of greenish yellow cyathias and involucres.
(A Cyathia is an inflorescence consisting of a cuplike cluster of modified leaves enclosing a female flower and several male flowers
Involucres are a series of bracts in or around a flower cluster)
Mason Street, Victoria BC

This euphorbia is an excellent drought tolerant hardy plant with a lovely chartreuse colour. However one should be cautious when pruning and trimming it - always use gloves as the sticky sap is poisonous. For this reason it should probably not be planted where there are small children