Penstemon
serrulatus
PNW
AK
BC
ID
OR
WA
810 specimens from 25 herbaria:
Alaska (1)
British Columbia (110)
Idaho (3)
Oregon (247)
Washington (449)
501 images from 22 herbaria:
CIC (1)
CIC-PYNF (1)
COCC (5)
EWU (6)
HJAEF (1)
HJAEFB (2)
HPSU (22)
ID (17)
IDS (3)
MORA (27)
NOCA (15)
OSC (106)
PLU (41)
PSM (9)
REED (6)
SOC (1)
SRP (9)
UBC (28)
WCW (3)
WS (164)
WTU (11)
WWB (23)