Monkshood

monkshood/ helmet flower: chivalry; knight-errantry  

Lady's Slipper

lady's slipper: capricious beauty

Iris

iris: faith; wisdom; promise in love; hope; wisdom and valor; a message; your friendship means so much to me; my compliments; fleur-de-lis (emblem of France) 
yellow: passion
german: flame

Abatina

abatina: fickleness 
fun fact: "abatina" is not a real flower. in fact, chances are the name was probably an error in Greenaway's 1892 printed volume. 

Acanthus

acanthus: the arts  

Hyssop

hyssop: sacrifice; cleanliness  
fun fact: you think you've purged when you move, but you've only just begun.   

Arum

arum/ wake robin: ardor  

Liverwort

liverwort: confidence

Azalea

azalea: take care; temperance; fragile; passion; Chinese symbols of womanhood  
fun fact: these guys are blooming EVERYWHERE at the moment, and come in a large range of colors.

Asphodel

asphodel: my regrets follow you to the grave  

Laurel

laurel: accomplishment  
fun fact: I moved yesterday and lived to tell the tale. I feel that's one heck of an accomplishment.