Illustrative key for Fumaria spp. in the Maltese Islands - by Stephen Mifsud.
Vers V3.82 (beta)

Fumaria
L.
Fummitory    Dahnet l-art
Family Description from Delta-key project by Watson & DalwitzList of species for this genus from the Plant List
Taxa left beyond this couplet: 15
F. agraria
F. barnolae
F. bastardii
F. bastardii
(cleistogamic form)
F. bicolor
F. capreolata
F. densiflora
F. flabellata
F. gaillardotii
F. muralis
F. officinalis subsp. officinalis
F. officinalis subsp. wirtgenii
F. parviflora
F. schleicheri
F. vaillantii
Description of Fumaria
Annuals with erect, diffuse or climbing stems. Leaves cauline, 2- to 4-pinnatisect. Inflorescence racemose, bracteate, with short pedicels. Sepals 2, lateral. Corolla zygomorphic, consisting of a spurred upper petal, 2 inner petals, and a lower one. Fruit 1-seeded, indehiscent, showing 2 apical pits in the mesocarp when dry. In W. Europe mostly weeds of arable land, but in S. & E. Europe found also in rocky, sandy and grassy places. Measurments are meant for typical specimens growing in their natural habitat. Fumaria can form reduced, undeveloped or dwarfed structures in impoverished habitats.
Description by P. D. Sell extracted from Flora Europaea Vol 1-5 (Tutin et al., 1964-1993)
Fumaria key steps >> 1
 
Lead

1.A

+
Length of corolla 9mm or less
ref

2

+ +
Widest parts of most leaf segments not more than 1.5mm
ref
OR
 
Lead

1.B

-
Length of corolla more than 9mm
 ref

7

- -
Widest parts of most leaf segments more than 1.5mm
ref
[A]     Illustration of Lead 1.A + [B]     Illustration of Lead 1.B - Identification Tips  
The corolla (=flower) is measured from end to end including the flaps at the mouth. For precission choose few mature flowers from different racemes / specimens and take an average.
Image of Fumaria densiflora by Stephen Mifsud Image of Fumaria bastardii by Stephen Mifsud -