Goutweed 
Great Basin Desert Parsley 
Great masterwort 
Great Masterwort 
Hacquetia epipactis 
Hairy Angelica 
Hairy Red Pittosporum 
Harbinger of Spring 
Heart-leaf Alexander 
Hemlock Water-Dropwort 
Hemlock waterparsnip 
Heptaptera anisoptera 
Heracleum humile 
Hydrocotyle vulgaris 
Indian biscuitroot 
Johrenia dichotoma 
Kippernut 
Knotted Hedgeparsley 
Largeleaf Pennywort 
Laserwort 
Leavenworth's Eryngo 
Lecokia cretica 
Lesser flannel flower 
Lisaea strigosa