Hardy perennial flowers for May, in America

MAY. 1. Veronica gentianoides. Gentian leaved Speedwell; blue. 2. Veronica spicata. Blue spiked Speedwell. 2. Pentstemon ovata. Oval leaved Pentstemon; blue. 2. Pentstemon atropurpureus. Dark purple Pentstemon. 2. Orobus niger. Dark purple Vetch. 1. Jeffersonia diphylla. Five-leaved Jeffersonia; white. 1. Lysimachia nummularia. Trailing Loose-strife; yellow. 1. Convallaria majalis. Lily of the Valley; white. 1. Saponaria ocymoides. Basil-like Soapwort; red. 1. Phlox pilosa. Hairy Phlox; red. 2. Anchusa Italica. Italian Bugloss; blue. 2. Ranunculus acris, pl. Double Buttercups; yellow. 2. Tradescantia virginica. Blue and white Spiderwort. 2. Lupinus polyphyllus. Purple Lupin. 2. Iris siberiaca. Siberian Iris; blue. 3. Iris florentina. Florentine Iris; white. 3. P�onia tenuifolia. Small leaved P�ony; red. 3. P�onia albiflora. Single white P�ony. 2. Lupinus nootkaensis. Nootka Sound Lupin; blue. 2. Hesperis matronalis, alba, pl. The double white Rocket. 2. Phlox suaveolens. The white Phlox or Lychnidea. 2. Phlox maculata. The purple spotted Phlox. 3. Hemerocallis flava. The yellow Day-Lily. 2. Lupinus perennis and rivularis. Perennial Lupins; blue. 2. Lychnis flos cuculi, pl. Double ragged-Robin; red. 2. Papaver orientalis. Oriental scarlet Poppy. 2, Aquilegia canadensis. Wild Columbine; scarlet. 1. Houstonia c�rulea. Blue Houstonia.