Flora Pittsburghensis

Index of Families

The list is also available in alphabetical order.

The basis of this list is the “Check List of the Vascular Flora of Allegheny County, Pennsylvania,” published in Trillia in 1951. It includes plants known to grow within ten miles of Allegheny County. We know of no more recent comprehensive list. The arrangement is based on Gray’s Manual, the eighth edition, and we have followed that arrangement, while attempting to indicate where current classifications deviate from it.

The 1951 list is generally a very good guide, but the local flora has changed somewhat since it was published. For example, the orange Daylily (Hemerocallis fulva) is marked in the list as rare, though locally abundant; now it is ubiquitous. Japanese Knotweed was rare; now it is a plague. We have added, in their proper places according to Gray, the new species we have observed.

The goal of this site is eventually to have all these pages fully populated with their local species, each species illustrated with original photographs. Right now we’re about halfway there. Completing the list may take years.

Araceae (Arum Family)


Commelinaceae (Spiderwort Family)

Liliaceae (Lily Family).—Note that this family is broken into multiple families and even different orders by current botanists.

Dioscoreaceae (Yam Family)

Iridaceae (Iris Family)

Orchidaceae (Orchid Family)

Cannabaceae or Cannabinaceae (Hemp Family)

Urticaceae (Nettle Family)

Santalaceae (Sandalwood Family)

Aristolochiaceae (Birthwort Family)

Polygonaceae (Knotweed Family)

Chenopodiaceae (Goosefoot Family)

Amaranthaceae (Amaranth Family)

Phytolaccaceae (Pokeweed Family)

Aizoaceae (Carpetweed Family)

Portulacaceae (Purslane Family)

Caryophyllaceae (Pink Family)

Nymphaceae (Water-Lily Family)

Ranunculaceae (Buttercup Family)

Berberidaceae (Barberry Family)

Menispermaceae (Moonseed Family)

Magnoliaceae (Magnolia Family)

Lauraceae (Bay Family)

Papaveraceae (Poppy Family)

Cruciferae or Brassicaceae (Mustard Family)

Crassulacae (Sedum Family)

Saxifragaceae (Saxifrage Family)

Hamamelidaceae (Witch-Hazel Family)

Platanaceae (Plane Family)

Rosaceae (Rose Family)

Leguminosae or Fabaceae (Pea Family)

Linaceae (Flax Family)

Oxalidaceae (Wood-Sorrel Family)

Geraniaceae (Geranium Family)

Simaroubaceae (Quassia Family)

Polygalaceae (Milkwort Family)

Euphorbiaceae (Spurge Family)

Limnanthaceae (False-Mermaid Family)

Anacardiaceae (Cashew Family)

Aquifoliaceae (Holly Family)

Celastraceae (Staff-Tree Family)

Staphyleaceae (Bladdernut Family)

Aceraceae (Maple Family)

Hippocastanaceae (Horse-Chestnut Family)

Balsaminaceae (Touch-Me-Not Family)

Rhamnaceae (Buckthorn Family)

Vitaceae (Vine or Grape Family)

Tiliaceae (Linden Family)

Malvaceae (Mallow Family)

Hypericaceae (St. John’s-Wort Family)

Cistaceae (Rockrose Family)

Violaceae (Violet Family)

Cactaceae (Cactus Family)

Lythraceae (Loosestrife Family)

Nyssaceae (Tupelo Family)

Onagraceae (Evening-Primrose Family)

Araliaceae (Ginseng Family)

Umbelliferae or Apiaceae (Parsley Family)

Cornaceae (Dogwood Family)

Pyrolaceae (Wintergreen Family)

Ericaceae (Heath Family)

Primulaceae (Primrose Family)

Ebenaceae (Ebony Family)

Oleaceae (Olive Family)

Gentianaceae (Gentian Family)

Apocynaceae (Dogbane Family)

Asclepiadaceae (Milkweed Family)

Convolvulaceae (Morning-Glory Family)

Polemoniaceae (Phlox Family)

Hydrophyllaceae (Waterleaf Family)

Boraginaceae (Forget-Me-Not Family)

Verbenaceae (Vervain Family)

Labiatae or Lamiaceae (Mint Family)

Solanaceae (Tomato Family)

Scrophulariaceae (Figwort Family)

Bignoniaceae (Bignonia Family)

Orobanchaceae (Broomrape Family)

Plataginaceae (Plantain Family)

Rubiaceae (Bedstraw or Madder Family)

Caprifoliaceae (Honeysuckle Family)

Dipsacaceae (Teasel Family)

Cucurbitaceae (Gourd Family)

Campanulaceae (Bellflower Family)

Compositae or Asteraceae (Composite, Aster, or Daisy Family)