Galleta, big _Hilaria rigida_ 22 Gamagrass _Tripsacum_ 26 Garlic _Allium_ 29 Garlicmustard _Alliaria_ 35 Gaura _Gaura_ 43 Gayfeather _Liatris_ 46 Gentian _Gentiana_ 43 Geranium _Geranium_ 43 Gerardia _Gerardia_ 43 Germander _Teucrium_ 54 Ghostpipe _Orobanche uniflora_ 49 Gianthyssop _Agastache_ 35 Giantreed _Arundo_ 19 Gilia _Gilia_ 43 Ginkgo _Ginkgo_ 57 Globemallow _Sphaeralcea_ 53 Goatgrass _Aegilops_ 18 Goldaster _Chrysopsis_ 39 Goldenrod _Solidago_ 53 Goldenweed _Haplopappus_ 44 Goldstargrass _Hypoxis hirsuta_ 29 Gooseberry _Ribes_ 58 Goosefoot _Chenopodium_ 39 Goosegrass _Eleusine_ 21 Grama _Bouteloua_ 19 Grape _Vitis_ 59 Greasewood _Sarcobatus_ 59 Greenbriar _Smilax_ 30 Greenthread _Thelesperma_ 54 Gromwell _Lithospermum_ 46 Groundcherry _Physalis_ 49 Groundivy _Glechoma hederacea_ 43 Groundsel _Senecio_ 52 Guineagrass _Panicum maximum_ 23 Gumweed _Grindelia_ 43 Hackberry _Celtis_ 56 Hairgrass _Aira; Deschampsia_ 18,20 Hairsedge bulbstyle _Bulbostylis cappillaris_ 27 Hardinggrass _Phalaris tuberosa_ var. _stenoptera_ 24 Haresear _Conringia_ 40 Hawkweed _Hieracium_ 44 Hawthorn _Crataegus_ 56