Cryptic Clues

Tropical plants with 7 letters
Acerola
Achocha
Annatto
Ayapana
Calumba
Carapia
Catuaba
Coirama
Copaiba
Cumanda
Cupuacu
Damiana
Embauba
Epazote
Genipap
Guajava
Guarana
Hortela
Huacapu
Iporuru
Mullaca
Mulungu
Mutamba
Nettles
Quassia
Rhatany

Well that didn't help me.
 
Firstly, I'm a twit because I should have been looking for 6char tropical plants, not 7 <doh>

Secondly, even if I had, loofah would not have been in my list. Had it been it would have been easy

Thirdly, I don't understand the significance of the word retired

................ and finally, I'm just useless at these
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I think we have to find another word for monarch and take the first one or more letters away to leave us with an anagram of "alamb" but as that doesn't lead me anywhere I have no idea.