Posted: 19/03/2016 at 15:00
It does look similar to Genista aetnensis aka Mount Etna Broom (one of my favourite trees).
I don't know Retama sphaerocarpa but if, as Marlorena says it's similar and more common in your area then my guess is that she's right and that's what it is - especially if it can cause allergic reactions.
I've never known the Genista to cause any allergy problems other than hayfever when it's in flower.
Hope your husband makes a swift recovery.