Helen Allen View Biography Acca sellowiana Helen Allen 2007293 Mespilus germanica, Helen Allen, 2023225 Philodendron bipinnatifidum, Helen Allen 2017137 Rosa rubiginosa (syn R.eglanteria), Helen Allen 2013112 Rosa x centifolia (syn Rosa gallica var. centifolia), Helen Allen 2012105 Brahea armata, Helen Allen 201182 Fagus sylvatica 'Aspleniifolia', Helen Allen 201068 Macleaya microcarpa, Helen Allen 200967 Aloe variegata, Helen Allen 200913 Cobaea scandens, Helen Allen 2006