Habenaria conspicua Nash Isotype
Habenaria filifera Watson Isosyntype
Habenaria pringlei Robinson Isotype
Habenaria subauriculata Robinson & Greenman Isotype
Halenia alleniana Standl. ex Wilbur Isotype
Halenia brevicoris var. chihuahuensis C. K. Allen Isotype
Halenia chlorantha Greenman Isotype
Halenia crassicula Robinson & Seaton Isotype
Halenia plantaginea forma grandiflora C. K. Allen Isotype
Halenia pringlei Robinson & Seaton Isotype
Halimium exaltatum Rose & Standley Isotype
Haplopappus nealleyi Coulter Isotype
Haplopappus racemosus ssp. bracycephalus H. M. Hall Unknown
Harperia nodosa Rose Isotype
Hechtia pringlei Robinson & Greenman Isotype
Hechtia tehuacana Robinson Isotype
Hedeoma blepharodonta Greene Isotype
Hedeoma nanum var. mexicanum Stewart Isotype
Hedeoma permixta Briq. Isotype
Hedeoma pringlei Briq. Isotype
Hedeoma quinquenervatum
Hedeoma serpyllifolia Small Isotype
Helianthemum nashii Britton Isotype
Helianthemum pringlei Watson Isotype
Helianthus ambulans E. E. Watson Holotype
Helianthus arenicola E. E. Watson Isotype
Helianthus arenicola E. E. Watson Isotype
Helianthus arenicola E. E. Watson Isotype
Helianthus arenicola E. E. Watson Holotype
Helianthus carnosus Small Isotype
Helianthus divariserratus [or x div.] R. W. Long Holotype
Helianthus glaucus Small Isotype
Helianthus severus E. E. Watson Holotype
Helianthus simulans E. E. Watson Holotype
Heliocarpus microcarpus Rose Isotype
Heliocarpus velutinus Rose Isotype
Heliopsis filifolia Watson Isotype
Heliopsis procumbens Hemsley Isotype
Heliotropium axillare Greenman Isotype
Heliotropium calcicola Fern. Isotype
Heliotropium mexicanum Greenman Isosyntype
Heliotropium oculatum Heller Isotype
Heliotropium pringlei Robinson Isosyntype
Hemibaccharis hieracioides S. F. Blake Isolectotype
Hemionitis elegans
Hesperolinon tehamense H. Sharsmith Isotype
Heterodraba unilateralis (Jones) Greene Isotype
Heuchera acutifolia Rose Isotype
Heuchera lithophila Heller Isotype
Hexatheca fulva ssp. beamanii B. L. Burtt Isotype
Hibiscus waimea Heller Isotype
Hieracium abscissum forma hypoglossum Zahn Isotype
Hieracium abscissum ssp. morelosanum S. F. Blake Isotype
Hieracium bulbisetum Arv.-Touv. Isotype
Hieracium comaticeps Blake Holotype
Hieracium comatum var. felipense Zahn Isosyntype
Hieracium comatum var. felipense Zahn Lectotype
Hieracium jaliscense B.L. Rob. & Greenm. Isosyntype
Hieracium jaliscense Robins. & Greenm. Syntype
Hieracium jaliscense subvar guadalajarense Zahn Isotype
Hieracium jaliscense var. eriobium Zahn Isotype
Hieracium liebmannii Zahn Isotype
Hieracium mexicanum ssp. praemorsiforme forma glabrescens Zahn Isotype
Hieracium oaxacanum Robins. & Greenm. Isotype
Hieracium tolucanum Arv.-Touv. Isotype
Hierochloe odorata var. fragrans forma eamesii Fern. Isotype
Hilaria cenchroides var. ciliatus Scribn. Isotype
Hilaria cenchroides var. longifolia Vasey Isotype
Hilaria cenchroides var. texana Vasey Unknown
Hinterhubera nevadensis Cuatrec. Unknown
Hiraea mexicana Rose Isotype
Hiraea parviflora Rose Isotype
Holodiscus australis Heller Isotype
Holodiscus saxicola Heller Isotype
Hordeum montanensis Scribner Holotype
Hosackia rigida var. nummularia Jones Isosyntype
Houstonia salina Heller Isotype
Houstonia umbratilis Robins. Isotype
Houstonia xestosperma Robins. & Greenm Isolectotype
Hydrophyllum albifrons Heller Isotype
Hygrophila pringlei Greenm. Unknown
Hymenocallis graminifolia Greenman Isotype
Hymenocallis riparia Greenman Isotype
Hymenoclea platyspina Seaman Isotype
Hymenopappus arenosus A. Heller Unknown
Hypericum brevistylum Choisy var. mexicanum Keller Isotype
Hypericum confusum Isotype
Hypericum diffusum Rose Isotype
Hypericum lissophloeus P. Adams Isotype
Hypericum simulans Rose Isotype
Hypericum submontanum Rose Isotype
Hypolytrum sandwithii Gilly Photograph
Hyptis chapalensis Briquet Isotype
Hyptis dumetorum Morong Isotype
Hyptis pringlei Fernald Isotype