Paederia pringlei Greenman Isotype
Palafoxia arida B. L. Turner & M. I. Morris Isotype
Panicum inflatum Scribner & Smith Isotype
Panicum leucothrix Nash Isosyntype
Panicum malacon Nash Isotype
Panicum nashianum Scribner Isosyntype
Panicum pilosum var. macranthum Scribner Isotype
Panicum reverchonii Vasey Isotype
Panicum sphagnicolum Nash Isosyntype
Panicum subspicatum Vasey Isotype
Panicum unispicatum Scribner & Merrill Isotype
Panicum vaseyanum Scribner ex Beal Holotype
Panicum viscidellum Scribner Isosyntype
Panicum webberianum Nash Isotype
Paphiopedilum richardianum Asher & Beaman Holotype
Paphiopedilum richardianum Asher & Beaman Photograph
Pappobolus sanchezii Panero Isotype
Pappophorum apertum Munro Isotype
Parinarium elmeri Merr. Isotype
Parishia elmeri Merr. Isotype
Parosela abietifolia Rose ex Rydb. Isotype
Parosela delicata Rose Isotype
Parosela lasiostoma Rose Isotype
Parosela minutiflora Rose Isotype
Parosela minutiflora Rose Isotype
Parosela oaxacana Rose Isotype
Parosela pauciflora Rose Isotype
Parthenium lozanianum
Parthenium rollinsianum Rzed. Isotype
Paspalum alcalinum Mez. Isotype
Paspalum boliviense Chase Unknown
Paspalum crinitum Chase Isotype
Paspalum dasytrichium Dusen ex Swallen Unknown
Paspalum dilatatum Poir. var. decumbens Vasey Isotype
Paspalum geminum Nash Isotype
Paspalum inops var. major Vasey Isotype
Paspalum longipilum Nash Isotype
Paspalum pittieri Hackel ex Beal Isotype
Paspalum prostratum Scribner & Merrill Isotype
Paspalum rigidifolium Nash Isotype
Paspalum tardum Nash ex Small Isotype
Passiflora gilbertiana J. M. MacDougal Isotype
Passiflora monadelpha P. M. Jorgensen & Holm-Nielsen Isotype
Pavonia melanommata Robinson & Seaton Isotype
Pavonia melanommata var. pringleana R. E. Fries Isotype
Pectis bracteata Watson Isotype
Pectis latisquama Sch. Bip. ex Greenman Isosyntype
Pectis lessingii Fern. Isosyntype
Pectis linearifolia Urban Isosyntype
Pectis oerstediana Rydb. Isotype
Pectis sinaloensis Fernald Isosyntype
Pectis sinaloensis Fernald Isosyntype
Pedicularis fulviatilis Heller Isotype
Pedilanthus tomentellus Robinson & Greenman Isosyntype
Pelexia pringlei Fernald Isotype
Pellaea pringlei
Pellaea ternifolia ssp. villosa
Pennisetum durum Beal Unknown
Penstemom confertus var. aberrans M. E. Jones Isosyntype
Penstemom desertipicti A. Nelson Isotype
Penstemom dolius Jones Isotype
Penstemon Isophyllus B.L. Robinson Isotype
Penstemon acuminatus var. congestus M. E. Jones Isosyntype
Penstemon apateticus ssp. apateticus Straw Isotype
Penstemon caudatus Heller Isotype
Penstemon chionophilus Greene ex Baker Isotype
Penstemon chionophilus Greene ex C.F. Baker Isotype
Penstemon cinerascens Greene ex C.F. Baker Isotype
Penstemon confertus var. globosus Piper Isotype
Penstemon deustus var. pedicellatus M. E. Jones Isotype
Penstemon piliferus Heller Isotype
Penstemon rhizomatosus N.H. Holmgren Isotype
Penstemon rotundifolius Gray Unknown
Penstemon smallii A. Heller Unknown
Penstemon thurberi var. anestius Reveal & Beatley Isotype
Penstemon variabilis Suksdorf Isotype
Peperomia pringlei DC. Isotype
Perezia capitata Watson Isotype
Perezia cuernavacana Robinson & Greenman Isotype
Perezia lozani Greenman Isotype
Perezia michoacana Robinson Isotype
Perezia rigida var. linearifolia Bacigalupi Isotype
Perezia scapiformis Bacigalupi Isotype
Perideridia bacigalupii T. I. Chuang & Constance Isotype
Perideridia bolanderi ssp. involucrata T.I. Chuang & Constance Isotype
Perideridia leptocarpa T. I. Chuang & Constance Isotype
Persea humilis Nash Isotype
Persea krugii Mez. Unknown
Persea krugii Mez. Unknown
Perymenium album Watson Isotype
Perymenium macrocephalum Greenman Isotype
Perymenium paneroi B. L. Turner Isotype
Perymenium paneroi B. L. Turner Isotype
Phacelia coulteri Greenman Isotype
Phacelia crenulata Torr. ex Watson Isotype
Phacelia demissa var. heterotricha J. T. Howell Isotype
Phacelia hirtuosa A. Gray Isotype
Phacelia idahoensis
Phacelia laxa Small Isotype
Phacelia magellanica forma compacta Brand Isotype
Phacelia magellanica ssp. barbata forma patula Brand Isotype
Phacelia verna Howell Isotype
Phaseolus lozanii Rose Isotype
Phaseolus lozanii Rose Isotype
Phaseolus pedatus Rose Isotype
Phaseolus smilacifolius Pollard Isotype
Pherotrichis leptogenia Robinson Isosyntype
Philactis fayi Torres Isotype
Phlox gilioides A. Nelson Isotype
Phlox lanata Piper Isotype
Phlox pilosa L. ssp. sangamonensis D.A. Levin & D.M. Smith Isotype
Phoebe areolatocostae C. K. Allen Isotype
Phoradendron forestierae Robinson & Greenman Isotype
Phyla nodiflora var. incisa (Small) Moldenke Isotype
Phyllanthus delicatissimus Jablonski Isotype
Phyllanthus paezensis Jablonski Isotype
Phyllanthus subcuneatus Greenman Isotype
Phymosia rzedowskii Fryxell Isotype
Physalis arenicola
Physalis subintegra Fernald Isosyntype
Physalis virginiana f. sanguinea Farwell Isotype
Pimpinella mexicana Robinson Isotype
Pinguicula ionantha R. K. Godfrey Isotype
Pinguicula parvifolia B. L. Robinson Isotype
Pinus clausa var. immuginata D. B. Ward Isotype
Pinus culminicola Andresen & Beaman Holotype
Pinus flexilis James Lectotype
Pinus pringlei Shaw Isolectotype
Pinus roseana Shaw Isotype
Piper achupallasense Yuncker Isotype
Piptothrix aegiroides B. L. Robinson Isotype
Piptothrix jaliscensis Greenman Isotype
Piptothrix paleacea Cronquist Isotype
Pipturus ruber Heller Isotype
Piqueria laxiflora Robinson & Seaton Isotype
Piqueria pringlei Robinson & Seaton Isotype
Piqueria pyramidilis Robinson Isotype
Piqueria serrata var. angustifolia B. L. Rob. & Greenm. Isotype
Piqueriopsis michoacana King Isotype
Pithecellobium matudai Lundell Unknown
Pithecellobium racemiflorum Donn. Sm. Isotype
Pithecolobium texense Coulter Isotype
Plagiobothrys jonesii A. Gray Unknown
Plantago tolucensis Pilger Isotype
Platanus glabrata Fernald Isotype
Platystemon tortuosus Greene Isotype
Pleurothallis resupinata
Pleurothyrium tomiwahlii van der Werff Isotype
Pluchea foetida var. imbricata
Pluchea longifolia Nash Isotype
Pluchea rosea var. mexicana Godfrey Isotype
Poa acuminata Scribner Holotype
Poa brevipaniculata Scribn. & Will. Isotype
Poa collinsii "T. Kirk, ex Petrie" Unknown
Poa confinis Vasey Isosyntype
Poa cusickii Vasey Isotype
Poa fendleriana var. arizonica T. A. Williams Isotype
Poa festucoides M.E. Jones Unknown
Poa grayana Vasey Holotype
Poa howellii Vasey & Scribner Isotype
Poa laevis Vasey Isotype
Poa macrantha Vasey Isosyntype
Poa macrantha Vasey Isosyntype
Poa macrantha Vasey Isosyntype
Poa pringlei Scribner Isotype
Poa strictiramea A. Hitchc. Isotype
Poa texana Vasey Holotype
Poa tracyi Vasey Isotype
Poa trivialis var. filiculmis Scribner Isotype
Poa vaseyana Scribner Holotype
Poa wolfii Scribner Isosyntype
Polemonium bicolor Greenman Isotype
Polemonium viscosum var. pilosum Greenman Isotype
Poliomintha bicolor Watson Isotype
Polygala albowiana Chodat Unknown
Polygala compacta Rose Isotype
Polygala cruciata var. ramosior Nash ex. B.L. Rob. & A. Gray Isosyntype
Polygala michoacana Robinson & Seaton Isotype
Polygala puberula var. ovalis Robinson & Greenman Isotype
Polygala subalata Watson Isotype
Polygonum meisnerianum var. japalense B. L. Robinson Isotype
Polygonum punctatum var. eciliatum Small Isotype
Polygonum ramosissimum f. atlanticum B. L. Robinson Isotype
Polymnia mcvaughii J. R. Wells Isotype
Populus x barnesii W. H. Wagner Isotype
Porophyllum calcicola B. L. Robinson & Greenman Syntype
Potamogeton columbianus Suksdorf Isotype
Potamogeton lateralis Morong Isolectotype
Potamogeton zoseriformis Fernald Isotype
Potentilla knoblochii Standley Isotype
Pouzolzia pringlei Greenman Isotype
Pringleochloa stolonifera Scribner Isotype
Prionosciadium cuneatum Coult. & Rose Isotype
Prionosciadium diversifolium Coulter & Rose Isotype
Prionosciadium macrophyllum Coult. & Rose Isotype
Prionosciadium megacarpum Coult. & Rose Isotype
Prionosciadium mexicanum var. acuminatum B. L. Rob. in Urbina Unknown
Prionosciadium nelsonii Coult. & Rose Isosyntype
Prunus injucunda Small Isotype
Psacalium beamanii H. Robinson Isotype
Pseudoeverardia flexifolia (Gilly) Gilley Holotype
Psoralea purshii Vail Isotype
Ptelea megacarpa Rose Isotype
Puccinellia rubida Elmer Isotype
Pyrrocoma brachycephala A. Nelson Isotype