| Symbol | Scientific name | Common name/Accepted name (for synonyms) | Family |
| IRLI | Iresine lindenii Van Houtte | Linden's bloodleaf | Amaranthaceae
|
| IRPA | Iresine palmeri (S. Wats.) Standl. | Palmer's bloodleaf | Amaranthaceae
|
| IRPA9 | Iresine paniculata (L.) Kuntze, non Poir. | Iresine diffusa | Amaranthaceae
|
| IRPA8 | Iresine paniculata Poir. | Iresine angustifolia | Amaranthaceae
|
| IRRH | Iresine rhizomatosa Standl. | Juda's bush | Amaranthaceae
|
| IRESI | Iresine P. Br. | bloodleaf | Amaranthaceae
|
| IRAC | Iris acleantha Small | Iris hexagona var. hexagona | Iridaceae
|
| IRAL3 | Iris alabamensis Small | Iris hexagona var. hexagona | Iridaceae
|
| IRAL4 | Iris albilinea Alexander | Iris hexagona var. hexagona | Iridaceae
|
| IRAL2 | Iris albispiritus Small | Iris hexagona var. savannarum | Iridaceae
|
| IRAL | Iris alticristata Small | Iris giganticaerulea | Iridaceae
|
| IRAM2 | Iris amabilis Eastw. | Iris macrosiphon | Iridaceae
|
| IRAM | Iris amnicola Alexander | Iris hexagona var. hexagona | Iridaceae
|
| IRAP | Iris aphylla L. | stool iris | Iridaceae
|
| IRAT | Iris atrocyanea Small | Iris hexagona var. hexagona | Iridaceae
|
| IRAT2 | Iris atroenantha Small | Iris hexagona var. hexagona | Iridaceae
|
| IRAU2 | Iris auralata Small | Iris hexagona var. hexagona | Iridaceae
|
| IRAU | Iris aurilinea Alexander | Iris giganticaerulea | Iridaceae
|
| IRBI | Iris bifurcata Small | Iris hexagona var. hexagona | Iridaceae
|
| IRBR | Iris bracteata S. Wats. | Siskiyou iris | Iridaceae
|
| IRBR2 | Iris brevicaulis Raf. | zigzag iris | Iridaceae
|
| IRBR3 | Iris brevipes Small | Iris brevicaulis | Iridaceae
|
| IRCA4 | Iris californica Leichtl. | Iris macrosiphon | Iridaceae
|
| IRCA | Iris callilopha Alexander | Iris hexagona var. hexagona | Iridaceae
|
| IRCA2 | Iris callirhodea Alexander | Iris hexagona var. hexagona | Iridaceae
|
| IRCA3 | Iris carolina Radius | Iris prismatica | Iridaceae
|
| IRCE4 | Iris cerasioides Alexander | Iris hexagona var. hexagona | Iridaceae
|
| IRCH2 | Iris chlorolopha Small | Iris hexagona var. hexagona | Iridaceae
|
| IRCH5 | Iris chrysaeola Small | Iris hexagona var. hexagona | Iridaceae
|
| IRCH3 | Iris chrysolopha Small | Iris hexagona var. hexagona | Iridaceae
|
| IRCH | Iris chrysophylla T.J. Howell | yellowleaf iris | Iridaceae
|
| IRCI | Iris citricristata Small | Iris giganticaerulea | Iridaceae
|
| IRCI2 | Iris citrina Eastw. | Iris tenuissima ssp. tenuissima | Iridaceae
|
| IRCI3 | Iris citriviola Small | Iris hexagona var. hexagona | Iridaceae
|
| IRCRL | Iris cristata Ait. ssp. lacustris (Nutt.) Iltis | Iris lacustris | Iridaceae
|
| IRCRA | Iris cristata Ait. var. alba Dykes | Iris cristata | Iridaceae
|
| IRCRL2 | Iris cristata Ait. var. lacustris (Nutt.) Dykes | Iris lacustris | Iridaceae
|
| IRCR | Iris cristata Ait. | dwarf crested iris | Iridaceae
|
| IRCR2 | Iris crocinubia Alexander | Iris hexagona var. hexagona | Iridaceae
|
| IRCY | Iris cyanantha Alexander | Iris hexagona var. hexagona | Iridaceae
|
| IRCY2 | Iris cyanochrysea Small | Iris hexagona var. hexagona | Iridaceae
|
| IRDE | Iris dewinkeleri Small | Iris hexagona var. hexagona | Iridaceae
|
| IRDOM2 | Iris douglasiana Herbert var. major Torr. | Iris douglasiana | Iridaceae
|
| IRDOO | Iris douglasiana Herbert var. oregonensis R.C. Foster | Iris douglasiana | Iridaceae
|
| IRDO | Iris douglasiana Herbert | Douglas iris | Iridaceae
|
| IRDU | Iris duerinckii Buckl. | Iris aphylla | Iridaceae
|
| IREC | Iris ecristata Alexander | Iris fulva | Iridaceae
|
| IREL | Iris elephantina Small | Iris giganticaerulea | Iridaceae
|
| IREN | Iris ensata Thunb. | Russian iris | Iridaceae
|
| IRFE | Iris fernaldii R.C. Foster | Fernald's iris | Iridaceae
|
| IRFL2 | Iris flavescens Delile | lemonyellow iris | Iridaceae
|
| IRFL4 | Iris florentina L. | Iris germanica var. florentina | Iridaceae
|
| IRFL3 | Iris fluviatilis Small | Iris giganticaerulea | Iridaceae
|
| IRFO | Iris foetidissima L. | stinking iris | Iridaceae
|
| IRFOB | Iris foliosa Mackenzie & Bush var. boonensis Daniels | Iris brevicaulis | Iridaceae
|
| IRFO2 | Iris foliosa Mackenzie & Bush | Iris brevicaulis | Iridaceae
|
| IRFO3 | Iris fourchiana Small | Iris hexagona var. hexagona | Iridaceae
|
| IRFU | Iris fulva Ker-Gawl. | copper iris | Iridaceae
|
| IRFU2 | Iris �fulvala Dykes | | Iridaceae
|
| IRFU3 | Iris fulvaurea Small | Iris hexagona var. hexagona | Iridaceae
|
| IRFU7 | Iris fumiflora Alexander | Iris hexagona var. hexagona | Iridaceae
|
| IRFU8 | Iris fumifulva Small | Iris hexagona var. hexagona | Iridaceae
|
| IRFU9 | Iris fuscaurea Small | Iris hexagona var. hexagona | Iridaceae
|
| IRFU4 | Iris fuscirosea Small | Iris hexagona var. hexagona | Iridaceae
|
| IRFU5 | Iris fuscisanguinea Alexander | Iris hexagona var. hexagona | Iridaceae
|
| IRFU6 | Iris fuscivenosa Small | Iris hexagona var. hexagona | Iridaceae
|
| IRGE2 | Iris gentilliana Alexander | Iris hexagona var. hexagona | Iridaceae
|
| IRGE3 | Iris georgiana Britt. | Iris hexagona var. hexagona | Iridaceae
|
| IRGEF | Iris germanica L. var. florentina (L.) Dykes | orris-root | Iridaceae
|
| IRGE | Iris germanica L. | German iris | Iridaceae
|
| IRGI | Iris giganticaerulea Small | giant blue iris | Iridaceae
|
| IRHAA | Iris hartwegii Baker ssp. australis (Parish) Lenz | rainbow iris | Iridaceae
|
| IRHAC | Iris hartwegii Baker ssp. columbiana Lenz | rainbow iris | Iridaceae
|
| IRHAH | Iris hartwegii Baker ssp. hartwegii | rainbow iris | Iridaceae
|
| IRHAP | Iris hartwegii Baker ssp. pinetorum (Eastw.) Lenz | rainbow iris | Iridaceae
|
| IRHAA2 | Iris hartwegii Baker var. australis Parish | Iris hartwegii ssp. australis | Iridaceae
|
| IRHA | Iris hartwegii Baker | rainbow iris | Iridaceae
|
| IRHEF | Iris hexagona Walt. var. flexicaulis (Small) R.C. Foster | Dixie iris | Iridaceae
|
| IRHEH | Iris hexagona Walt. var. hexagona | Dixie iris | Iridaceae
|
| IRHES | Iris hexagona Walt. var. savannarum (Small) R.C. Foster | savanna iris | Iridaceae
|
| IRHE2 | Iris hexagona Walt. | Dixie iris | Iridaceae
|
| IRHO2 | Iris hookeri Penny ex D. Don | Iris setosa var. canadensis | Iridaceae
|
| IRHU | Iris humboldtiana Eastw. | Iris tenuissima ssp. tenuissima | Iridaceae
|
| IRIA | Iris ianthina Alexander | Iris hexagona var. hexagona | Iridaceae
|
| IRIN | Iris innominata Henderson | Del Norte County iris | Iridaceae
|
| IRIO | Iris iochroma Small | Iris hexagona var. hexagona | Iridaceae
|
| IRIO5 | Iris iocyanea Small | Iris hexagona var. hexagona | Iridaceae
|
| IRIO4 | Iris iodantha Alexander | Iris hexagona var. hexagona | Iridaceae
|
| IRIO2 | Iris ioleuca Alexander | Iris hexagona var. hexagona | Iridaceae
|
| IRIO3 | Iris iophaea Alexander | Iris hexagona var. hexagona | Iridaceae
|
| IRKA | Iris kaempferi Sieb. ex Lem. | Iris ensata | Iridaceae
|
| IRKI | Iris kimballiae Small | Iris hexagona var. hexagona | Iridaceae
|
| IRLA | Iris lacustris Nutt. | dwarf lake iris | Iridaceae
|
| IRLA4 | Iris laevigata Fisch. | rabbitear iris | Iridaceae
|
| IRLA2 | Iris lancipetala Alexander | Iris hexagona var. hexagona | Iridaceae
|
| IRLA3 | Iris landsdaleana Eastw. | Iris purdyi | Iridaceae
|
| IRLO | Iris longipetala Herbert | Iris missouriensis | Iridaceae
|
| IRLU2 | Iris ludoviciana Small | Iris hexagona var. hexagona | Iridaceae
|
| IRLU | Iris lutescens Lam. | Crimean iris | Iridaceae
|
| IRMAP | Iris macrosiphon Torr. var. purdyi (Eastw.) Jepson | Iris purdyi | Iridaceae
|
| IRMA | Iris macrosiphon Torr. | bowltube iris | Iridaceae
|