While the focus is on wildflowers, in July 2020 I started adding non-flowering plants. Families are listed in alphabetical order by English family name (unless there isn't one). The family level pages are bandwidth-intensive and best searched using a high speed connection.
Agave Family (Agavaceae)
Amaranth Family (Amaranthaceae)
Amaryllis Family (Amaryllidaceae)
Arrowgrass Family (Juncaginaceae)
Asparagus Family (Asparagaceae)
Barberry Family (Berberidaceae)
Beech Family (Fagaceae)
Bellflower Family (Campanulaceae)
Bignonias Family (Bignoniaceae)
Borage Family (Boraginaceae)
Broomrape Family (Orobanchaceae)
Buckthorn Family (Rhamnaceae)
Buckwheat Family (Polygonaceae)
Bunchflower Family (Melanthiaceae)
Buttercup Family (Ranunculaceae)
Cactus Family (Cactaceae)
Caltrop Family (Zygophyllaceae)
Cattail Family (Typhaceae)
Cypress Family (Cupressaceae)
Dayflower Family (Commelinaceae)
Dogbane Family (Apocynaceae)
Elm Family (Ulmaceae)
Ephedra Family (Ephedraceae)
Evening Primrose Family (Onagraceae)
Fig-Marigold Family (Aizoaceae)
Figwort Family (Scrophulariaceae). No longer includes penstemons and many other species.
Flax Family (Linaceae)
Four O'Clock Family (Nyctaginaceae)
Gentian Family (Gentianaceae)
Geranium Family (Geraniaceae)
Gooseberry Family (Grossulariaceae)
Gourd Family (Cucurbitaceae)
Grape Family (Vitaceae)
Grass Family (Poaceae)
Heath Family (Ericaceae)
Honeysuckle Family (Caprifoliaceae)
Horsetail Family (Equisetaceae)
Hydrangea Family (Hydrangeaceae)
Iris Family (Iridaceae)
Lily Family (Liliaceae)
Lizard's Tail Family (Saururaceae)
Loasa Family (Loasaceae)
Madder Family (Rubiaceae)
Mallow Family (Malvaceae)
Milkwort Family (Polygalaceae)
Mint Family (Lamiaceae)
Morning Glory Family (Convolvulaceae)
Moschatel Family (Adoxaceae)
Mulberry Family (Moraceae)
Mustard Family (Brassicaceae)
Oleaster Family (Elaeagnaceae)
Olive Family (Oleaceae)
Orchid Family (Orchidaceae)
Parsley Family (Apiaceae)
Pea Family (Fabaceae)
Phlox Family (Polemoniaceae)
Pine Family (Pinaceae)
Pink Family (Caryophyllaceae)
Plane Tree Family (Platanaceae)
Plantain Family (Plantaginaceae). Now includes penstemons.
Plumbago Family (Plumbaginaceae)
Poppy Family (Papaveraceae)
Potato Family (Solanaceae)
Primrose Family (Primulaceae)
Purslane Family (Portulacaceae)
Quassia Family (Simaroubaceae)
Rose Family (Rosaceae)
Rush Family (Juncaceae)
Sandalwood Family (Santalaceae)
Saxifrage Family (Saxifragaceae)
Sedge Family (Cyperaceae)
Soapberry Family (Sapindaceae)
Spurge Family (Euphorbiaceae)
Staff Vine or Bittersweet Family (Celastraceae)
Sumac Family (Anacardiaceae)
Tamarisk Family (Tamaricaceae)
Unicorn Plant Family (Martyniaceae)
Valerian Family (Valerianaceae)
Verbena Family (Verbenaceae)
Violet Family (Violaceae)
Watermilfoil Family (Haloragaceae)
Water-Plantain Family (Alismataceae)
Willow Family (Salicaceae)
Wood Sorrel Family (Oxalidaceae)