Shiny-leaved Hawthorn
Crataegus erythropoda

Family: Rose (Rosaceae)
AKA: Red-stemmed Hawthorn, Cerro Hawthorn
Photo taken on: June 9, 2006
Location: Almont, CO
Life Zones: Plains to montane
Habitat: Moist areas

A shrub which can grow to be a small tree at 15ft. It has shiny dark red bark and thorns at the base of the leaves. Leaves are shiny, oval in shape with short teeth.

Fruit is edible for wildlife.

Photo taken on: August 4, 2006
Location: Almont, CO

Flora of North America reference.

Green Hawthorn
Crataegus viridis

Family: Rose (Rosaceae)
AKA:
Photo taken on: May 23, 2019
Location: Abiquiu, NM
Life Zones: Plains to montane
Habitat: Moist areas

A small tree growing to 15 feet. Young twigs are red, bark is scaly and gray on mature trees. Leaves are lobed and toothed without thorns at the base. Flowers grow in flat-topped clusters and have an unpleasant fragrance.

Photo taken on: October 4, 2019
Location: Abiquiu, NM

This plant is native to the south central United States. I believe this is a cultivar planted in New Mexico as a landscape tree.

Flora of North America reference.

River Hawthorn
Crataegus rivularis

Family: Rose (Rosaceae)
AKA:
Photo taken on: May 27, 2021
Location: CR 110, Canjilon, NM
Life Zones: Foothills to montane
Habitat: Moist areas, ditches, river banks

A small tree growing to 16 feet forming dense colonies with masses of flowers. Twigs are dark red and shiny. Straight or slightly curved thorns grow from the twigs and are 1" long. Leaves are about 1" wide and 2" long, have no lobes and are finely toothed. Flowers have a strong, sweet fragrance.  Fruit is deep red maturing to blackish.

Flora of North America reference.