Ulmus americana 'Augustine'

'Augustine' is a vigorous fastigiate tree distinguished by its thicker branches and larger, more deeply toothed leaves.[5][6] Flower and Garden Magazine reported that the original tree was still standing in 1959 and – erroneously – that the cultivar did not produce seed.[3][7] The deep root-system of the cultivar was said to be less likely to damage sidewalks than American elm generally.[3][8]

'Augustine' has proven particularly susceptible to Dutch elm disease, exhibiting 36% crown dieback in one year after inoculation with the pathogen.[9] The species is also highly susceptible to Elm Yellows and is also moderately preferred for feeding and reproduction by the adult Elm Leaf Beetle Xanthogaleruca luteola,[10] and highly preferred for feeding by the Japanese Beetle Popillia japonica [11][12] in the United States. U. americana is also the most susceptible of all the elms to verticillium wilt.[13]

As well as being planted originally as a highway elm in Illinois in locations such as Winnetka and Cicero (where a two-and-a-half mile median strip in a highway was lined with the cultivar),[3] by 1956 55,000 'Augustine' were reported thriving in thirty-eight states.[8] 'Augustine' was among the elms planted in the United States National Arboretum, Washington, D.C., and, in the 1960s, in the National Mall, where despite Dutch elm disease 32 were still standing in 2007[6] and 20 in 2018.[1] The tree is not known to have been cultivated beyond the United States, where it is no longer in commerce.

• 'Augustine Ascending': Weston, in Horticulture, II.30: 448, 1952.