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Taxonomic exploration
Trees
Taxa with a Tree growth habit — from coast redwoods to high-elevation krummholz pines.
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Showing 1,851–1,900 of 2,324.
- Quercus ×pauciloba Rydb. (pro sp.) [gambelii × turbinella] QUPA4Fagaceae
- Quercus ×pseudomargaretta Trel. (pro sp.) [margarettae × stellata] QUPSfalse sand post oak · Fagaceae
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Quercus ×rehderi Trel. [ilicifolia × velutina] QUREhybrid oak · Fagaceae - Quercus ×riparia Laughlin [rubra × shumardii] QURIhybrid oak · Fagaceae
- Quercus ×robbinsii Trel. [coccinea × ilicifolia] QUROhybrid oak · Fagaceae
- Quercus ×rolfsii Small (pro sp.) [chapmanii × minima] QURO4hybrid oak · Fagaceae
- Quercus ×rudkinii Britton (pro sp.) [marilandica × phellos] QURU2hybrid oak · Fagaceae
- Quercus ×runcinata (A. DC.) Engelm. [imbricaria × rubra] QURU3hybrid oak · Fagaceae
- Quercus ×saulii C.K. Schneid. [alba × montana] QUSAhybrid oak · Fagaceae
- Quercus ×schuettei Trel. [bicolor × macrocarpa] QUSC2hybrid oak · Fagaceae
- Quercus ×stelloides Palmer [prinoides × stellata] QUST2hybrid oak · Fagaceae
- Quercus ×sterilis Trel. ex Palmer [marilandica × nigra] QUST3hybrid oak · Fagaceae
- Quercus ×sterretii Trel. [lyrata × stellata] QUST4hybrid oak · Fagaceae
- Quercus ×subconvexa Tucker [durata × garryana] QUSU4hybrid oak · Fagaceae
- Quercus ×subfalcata Trel. [falcata × phellos] QUSU6hybrid oak · Fagaceae
- Quercus ×subintegra (Engelm.) Trel. [falcata × incana] QUSU2hybrid oak · Fagaceae
- Quercus ×tharpii C.H. Mull. (pro sp.) [emoryi × graciliformis] QUTHTharp oak · Fagaceae
- Quercus ×tottenii Melvin [lyrata × michauxii] QUTO4hybrid oak · Fagaceae
- Quercus ×tridentata (Engelm. ex A. DC.) Trel. (pro sp.) [imbricaria × marilandica] QUTRhybrid oak · Fagaceae
- Quercus ×vaga Palmer & Steyerm. [palustris × velutina] QUVA2hybrid oak · Fagaceae
- Quercus ×venulosa Ashe [arkansana × incana] QUVE2hybrid oak · Fagaceae
- Quercus ×walteriana Ashe [laevis × nigra] QUWAhybrid oak · Fagaceae
- Quercus ×willdenowiana (Dippel) Beissner, Schelle & Zabel (pro sp.) [falcata × velutina] QUWIhybrid oak · Fagaceae
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Radermachera sinica (Hance) Hemsl. RASI5china doll · Bignoniaceae -
Randia aculeata L. RAACwhite indigoberry · Rubiaceae -
Rauvolfia sandwicensis A. DC. RASA3devil's-pepper · Apocynaceae -
Rauvolfia vomitoria Afzelius RAVOpoison devil's-pepper · Apocynaceae -
Reynoldsia sandwicensis A. Gray RESA'ohe makai · Araliaceae -
Reynosia septentrionalis Urb. RESEdarlingplum · Rhamnaceae -
Rhamnus cathartica L. RHCA3common buckthorn · Rhamnaceae -
Rhamnus crocea Nutt. RHCRredberry buckthorn · Rhamnaceae - Rhamnus crocea Nutt. ssp. crocea RHCRCredberry buckthorn · Rhamnaceae
- Rhamnus crocea Nutt. ssp. pilosa (Trel.) C.B. Wolf RHCRP2hollyleaf buckthorn · Rhamnaceae
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Rhamnus davurica Pall. RHDADahurian buckthorn · Rhamnaceae - Rhamnus davurica Pall. ssp. davurica RHDAD2Dahurian buckthorn · Rhamnaceae
- Rhamnus ilicifolia Kellogg RHILhollyleaf redberry · Rhamnaceae
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Rhamnus lanceolata Pursh RHLAlanceleaf buckthorn · Rhamnaceae - Rhamnus lanceolata Pursh ssp. glabrata (Gleason) Kartesz & Gandhi RHLAG2lanceleaf buckthorn · Rhamnaceae
- Rhamnus lanceolata Pursh ssp. lanceolata RHLAL3lanceleaf buckthorn · Rhamnaceae
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Rhamnus pirifolia Greene RHPIisland redberry · Rhamnaceae -
Rhizophora mangle L. RHMA2red mangrove · Rhizophoraceae -
Rhododendron catawbiense Michx. RHCA8Catawba rosebay · Ericaceae -
Rhododendron macrophyllum D. Don ex G. Don RHMA3Pacific rhododendron · Ericaceae -
Rhododendron maximum L. RHMA4great laurel · Ericaceae -
Rhodomyrtus tomentosa (Aiton) Hassk. RHTO10rose myrtle · Myrtaceae -
Rhus copallinum L. RHCOwinged sumac · Anacardiaceae - Rhus copallinum L. var. copallinum RHCOCwinged sumac · Anacardiaceae
- Rhus copallinum L. var. latifolia Engl. RHCOL2winged sumac · Anacardiaceae
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Rhus glabra L. RHGLsmooth sumac · Anacardiaceae -
Rhus integrifolia (Nutt.) W.H. Brewer & S. Watson RHIN2lemonade sumac · Anacardiaceae