This is why people used to buy them.
Foliage is alternate, simple, 1-2" long, dark green in summer, pale yellow fall color, margins lobed, generally 5 lobes.
On young stems you can find stipules.
Flowers are pink-scarlet double.
Fruit is rarely produced, but occasionally you will find a small red pome.
Stems have thorns, heavy on young stems.
Flower buds rounded.
Trees are notorious for producing water sprouts in the canopy.
Misidentification:
Most likely another Hawthorn, but not in bloom or the Washington thorn.
Location
Aptos
450 At Andrews Dr
417 Dorsey Ave
Santa Cruz
726 Hanover St