Brooms:

 

Scotch broom

Cytisus scoparius

Portuguese broom

Cytisus striatus

French broom

Genista monspessulana

Spanish broom

Spartium junceum

bridal broom

Retama (= Genista) monosperma

stems

usually 5-angled

+/- star-shaped in x-section

8-10-ridged

round in x-section

8-10-ridged

round in x-section

finely ribbed

round in x-section

finely ribbed

round in x-section

slender, lax

leaves

compound, leaflets 3, sometimes single on new twigs

deciduous

compound, leaflets 3, sometimes single on new twigs

deciduous

compound, leaflets 3, usually dense

 

evergreen

simple, sparse

 

 

deciduous

simple, sparse

 

 

deciduous

flowers single or paired in leaf axils single or paired in leaf axils 4-10 in head-like clusters at ends of short axillary branchlets several in open racemes at stem tips 2-20 in short axillary racemes or clusters
petals yellow or partially to entirely dark red yellow yellow yellow white
calyx

2-lipped, top lip minutely toothed

 

 

glabrous

2-lipped, top lip minutely toothed

 

 

pubescent

2-lipped, top lip 2-lobed to near middle, lower lip shallow (1-)3-lobed

pubescent

1-lipped, parted to base on top (rarely 2-lipped & 5-lobed)

glabrous

2-lipped, purplish,

top lip 2-lobed to near middle, lower lip shallow 3-lobed

glabrous

pods

flattened

glabrous with margins densely lined with long hairs

2-5 cm long

~ 1 cm wide

slightly inflated

densely covered with long hairs

 

 

1.5-5 cm long

~ 1 cm wide

slightly flattened

densely covered with long hairs

 

 

1-3 cm long

~ 0.5 cm wide

slightly flattened

densely covered with long hairs

 

 

4-11 cm long

~ 0.5 cm wide

spherical to ovoid

glabrous

 

do not split in half

~ 1 cm long

nearly as wide