Replication of imaging data
	Figure panels	Replication
A. thaliana: WT
time-lapse	Fig. 1 C, E, G, I, J; 2D; 3C; S1 A, C, E, L-O; S3 O	5
time-lapse protrusion	Fig. S2 A-C	5
Sinus initiation in the blade (time-lapse)	Fig. 1 O	5
Growth/Proliferation vs PD-position (growth alignment map)	Fig. 1 K, M	3
Protrusion growth alignment map	Fig. S1 T	3
Primordium contribution (growth alignment map)	Fig. 4 G	5
pPIN1::PIN1:GFP expression	Fig. 2 A, C; S5 A, B, G	10
pDR5::GFP/CUC2:VENUS time-lapse and expression	Fig. 3D	3
BLS::3xGFP expression	Fig. S6 W	7
A. thaliana: NPA treatment (10 uM)
time-lapse	Fig. S3 A, C, E, G, I	3
A. thaliana: IAA treatment (5 um)
time-lapse	Fig. 2J,K; S3 K-N	4
A. thaliana: cuc2-3 mutant
time-lapse	Fig. 2G-I; S4 B, C, J	3
A. thaliana: pin1 mutant
time-lapse	Fig. S4 D-G	4
A. thaliana: RCOg
time-lapse	Fig. 4 O,P; S6 A, C, E, G	3
time-lapse: protrusion	Fig. S2 G-I	3
RCOg-VENUS expression	Fig. 4 V	5
pPIN1::PIN1:GFP expression	Fig. S5 H	3
Primordia contribution (Growth alignment map)	Fig. 4 H	5
A. thaliana: BLS::STM
time-lapse	Fig. 4 S,T; S6 I,K,M,O	5
protrusion time-lapse	Fig. S2 J-L	5
extra protrusion (compared to WT)	Fig. S6 Q	5/8
pPIN1::PIN1:GFP expression	Fig. S5 I	8
BLS≫STM-VENUS expression	Fig. 4 X	7
Primordia contribution (Growth alignment map)	Fig. 4 I	3
A. thaliana: p35S::AtKRP2
time-lapse	Fig. 5 C-G	4
A. thaliana: RCOg-V/BLS::STM
RCOg-VENUS expression	Fig. 6 Q	4
C. hirsuta: WT
time-lapse	Fig. 1 D, F, H-J; 2F; S1 B, D, F, P-S	3
time-lapse protrusion	Fig. S2 D-F	3
Sinus initiation adjacent to the midrib (time-lapse)	Fig. 1 P	3
Growth/Proliferation vs PD-position (growth alignment map)	Fig. 1 L, N	3
Additional protrusion in terminal leaflet	Fig. S1 K	3
Protrusion growth alignment map	Fig. S1 U	3
Primordium contribution (growth alignment map)	Fig. 4 J	3
pPIN1::PIN1:GFP expression	Fig. 2 B, E; S5 C, D, E, J	6
RCOg-VENUS expression	Fig. 4 U; 6 R	6
pCHSTM::STM-VENUS expression	Fig. 4 W	7
pChSTM::3xVENUS expression	Fig. S6 W	5
C. hirsuta: NPA treatment (10 uM)
time-lapse	Fig. S3 B, D, F, H, J	3
C. hirsuta: pML1::PIN1:GFP
pDR5::VENUS expression and leaf morphology	Fig. S5 F	5
C. hirsuta: rco mutant
time-lapse	Fig. 4 M, N; S6 B, D, F, H	3
pPIN1::PIN1:GFP expression	Fig. S5 K	7
Primordia contribution (Growth alignment map)	Fig. 4 K	3
C. hirsuta: stm mutant
time-lapse	Fig. 4 Q,R; S6 J, L, N, P, R	5
pPIN1::PIN1:GFP expression	Fig. S5 L	6
Primordia contribution (Growth alignment map)	Fig. 4 L	3
A. thaliana vs C. hirsuta
Stomata appear earlier in A. thaliana vs C. hirsuta	Fig. S1 E, F	4 from each species