$modus 0:
$modus 1:
Crataegus invisa
Crataegus invisa Sarg. [Accepted]
Rosaceae Rosoideae Crataegeae
2 284711 Crataegus invisa Sarg.
C.S. Sargent, Trees & Shrubs, vol. 2 : t. 160 (1855) [C.E. Faxon]