| 934 | Heterotheca pumila | yellow 12-30cm 19 | G | 
      
                                                                      | 935 | Heterotheca villosa | yellow 16-40cm 19 | G | 
      
                                                                      | 936 | Heuchera abramsii | reddish-purple/white 6-15cm 63 | G | 
      
                                                                      | 937 | Heuchera americana | some silver/red lvs 60 | G | 
      
                                                                      | 938 | Heuchera bracteata | greenish yellow 6-28cm 13 | G | 
      
                                                                      | 3159 | Heuchera cylindrica | white 30cm Montana: West Glacier 30 | W | 
      
                                                                      | 940 | Heuchera pulchella | reddish rose/pink 7-15cm 155 | G | 
      
                                                                      | 941 | Heuchera richardsonii | green/greenish-white 20-95cm 15 45 | G | 
      
                                                                      | 3160 | Heuchera sp | pink flr/green lvs Arizona: Santa Rita Mtns 93 | W | 
      
                                                                      | 943 | Hibiscus coccineus | bright red to 3m 161 | G | 
      
                                                                      | 944 | Hibiscus moscheutos hybrid | pink/pink eye 150cm 119 | G | 
      
                                                                      | 945 | Hibiscus moscheutos hybrid | white/pink eye 150cm 119 | G | 
      
                                                                      | 946 | Hibiscus moscheutos hybrid | white/pink picotee 150cm 119 | G | 
      
                                                                      | 947 | Hieracium bombycinum | yellow flr/woolly lvs 5-20cm 65 | G | 
      
                                                                      | 948 | Hieracium maculatum | yellow flr/mottled lvs 10-50cm 120 | G | 
      
                                                                      | 949 | Hieracium maculatum 'Leopard' | yellow flr/maroon mottled lvs 15-25cm 4 | G | 
      
                                                                      | 950 | Hieracium villosum | yellow flr/silver-grey woolly lvs 30-45cm 65 74 155 | G | 
      
                                                                      | 951 | Hippocrepis comosa | yellow to 10cm 48 | G | 
      
                                                                      | 952 | Hormathophylla spinosa | white flr/grey-green lvs 15-30cm 165 | G | 
      
                                                                      | 953 | Horminum pyrenaicum | violet-blue/dark purple 20-45cm 13 | G | 
      
                                                                      | 954 | Hornungia alpina | white 5-10cm 27 | G | 
      
                                                                      | 3161 | Hosackia (Lotus) crassifolia | purple 100cm Oregon: Sisters 1036m 135 | W | 
      
                                                                      | 955 | Hosta venusta | purple violet 8-24cm 60 | G | 
      
                                                                      | 957 | Houstonia canadensis | pale purplish pink-white 10-25cm 165 | G | 
      
                                                                      | 958 | Hunnemannia fumariifolia | yellow flr/grey-green lvs to 60cm 10 113 | G | 
      
                                                                      | 959 | Hyacinthoides hispanica | blue-lavender 20-45cm 18 | G | 
      
                                                                      | 960 | Hyacinthoides hispanica | mix pink/white 30-40cm 165 | G | 
      
                                                                      | 961 | Hyacinthoides non-scripta | violet-blue 20-50cm 48 | G | 
      
                                                                      | 962 | Hyacinthoides reverchonii | blue 10-25cm 21 | G | 
      
                                                                      | 963 | Hydrangea radiata (ex Pickens Co, South Carolina) | 152 | G | 
      
                                                                      | 964 | Hydrastis canadensis (moist packed) | white flr/red frt 15-50cm 165 | G | 
      
                                                                      | 966 | Hymenopappus newberryi | white/pinkish 20-60cm 155 | G | 
      
                                                                      | 967 | Hypericum androsaemum 'Albury Purple' | yellow flr/purplish lvs/red frt 45-90cm 4 | G | 
      
                                                                      | 968 | Hypericum ascyron (ex New Hampshire) | yellow 80cm 128 | G | 
      
                                                                      | 969 | Hypericum athoum | pale yellow to 20cm 145 | G | 
      
                                                                      | 970 | Hypericum coris | yellow 10-40cm 7 | G | 
      
                                                                      | 971 | Hypericum olympicum | yellow flr/grey-green lvs to 25cm 28 160 | G | 
      
                                                                      | 972 | Hyssopus officinalis | blue-purple 30-60cm 151 | G | 
      
                                                                      | 973 | Hyssopus seravschanicus | blue-violet 40-50cm 165 | G | 
      
                                                                      | 974 | Iberis aurosica ssp nana | white 5-10cm 69 | G | 
      
                                                                      | 975 | Iberis oschtenica | pink-white 10-15cm 70 | G | 
      
                                                                      | 976 | Iberis simplex | white-lilac 10-20cm 123 155 | G | 
      
                                                                      | 977 | Iberodes (Omphalodes) linifolia | white/very pale blue 30-40cm 56 | G | 
      
                                                                      | 979 | Ikonnikovia kaufmanniana | purple 14-35cm 155 | G | 
      
                                                                      | 980 | Iliamna bakeri | pink-lavender 30-70cm 25 | G | 
      
                                                                      | 981 | Iliamna remota | pale rose-purple 1-2.5m 142 | G | 
      
                                                                      | 1906 | Impatiens balsamina (PI) | pink/red/mauve/purple/white 20-75cm 172 | G | 
      
                                                                      | 984 | Impatiens bicolor | pink/yellow 26-75cm 17 134 | G | 
      
                                                                      | 987 | Incarvillea delavayi | rose-purple/pink 30-60cm 42 53 129 | G | 
      
                                                                      | 988 | Incarvillea delavayi 'Snowtop' | white 30-45cm 53 | G |