Reichenbach, H.G.L.,
Flora exotica. Die Prachtpflanzen des Auslandes
(1834-1836)
Fl. Exot.
vol. 4
(1835)
t.
217
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Penstemon speciosus Douglas
name cited:
Penstemon speciosus Douglas
name recognized:
Penstemon speciosus Douglas
family:
Scrophulariaceae
subfamily: Antirrhinoideae
tribe: Cheloneae
epithet:
speciosus,-a,-um
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