Online Volumes Volume 1 Introduction Volume 2 Pteridophytes and Gymnosperms 31 families Volume 3 Magnoliophyta: Magnoliidae and Hamamelidae 32 families Volume 4 Magnoliophyta: Caryophyllidae, Part 1 10 families Volume 5 Magnoliophyta: Caryophyllidae, part 2 3 families Volume 19 Asteraceae (with volumes 20 and 21) 1 family Volume 20 Partial, Enter from Volume 19 1 family Volume 21 Partial, Enter from Volume 19 1 family Volume 22 Magnoliophyta: Alismatidae Arecidae, Commelinidae (in Part), and Zingiberidae 30 families Volume 23 Magnoliophyta: Commelinidae (in part): Cyperaceae 1 family Volume 26 Magnoliophyta: Liliidae: Liliales and Orchidales 11 families Volume 27 Bryophytes: Mosses, part 1 33 families
Credit: Harvard University Herbaria