| Symbol | Scientific name | Common name/Accepted name (for synonyms) | Family |
| CYPL8 | Cypripedium planipetalum (Fern.) Morris & Eames | Cypripedium pubescens var. pubescens | Orchidaceae
|
| CYPUM | Cypripedium pubescens Willd. var. makasin Farw. | greater yellow lady's slipper | Orchidaceae
|
| CYPUP | Cypripedium pubescens Willd. var. pubescens | greater yellow lady's slipper | Orchidaceae
|
| CYPU10 | Cypripedium pubescens Willd. | greater yellow lady's slipper | Orchidaceae
|
| CYRE6 | Cypripedium reginae Walt. | showy lady's slipper | Orchidaceae
|
| CYYA | Cypripedium yatabeanum Makino | Cypripedium guttatum var. yatabeanum | Orchidaceae
|
| CYPRI | Cypripedium L. | lady's slipper | Orchidaceae
|
| CYHU3 | Cypselea humifusa Turp. | panal | Aizoaceae
|
| CYPSE | Cypselea Turp. | cypselea | Aizoaceae
|
| CYAN11 | Cyrilla antillana Michx. | Cyrilla racemiflora | Cyrillaceae
|
| CYAR11 | Cyrilla arida Small | Cyrilla parvifolia | Cyrillaceae
|
| CYPA6 | Cyrilla parvifolia Raf. | littleleaf titi | Cyrillaceae
|
| CYRAP2 | Cyrilla racemiflora L. var. parvifolia (Raf.) E. Murr. | Cyrilla parvifolia | Cyrillaceae
|
| CYRAS | Cyrilla racemiflora L. var. subglobosa Fern. | Cyrilla parvifolia | Cyrillaceae
|
| CYRA | Cyrilla racemiflora L. | swamp titi | Cyrillaceae
|
| CYRIL | Cyrilla Garden ex L. | titi | Cyrillaceae
|
| CYAD | Cyrtandra adpressipilosa St. John | Cyrtandra laxiflora | Gesneriaceae
|
| CYAL3 | Cyrtandra �alata St. John & Storey (pro sp.) | | Gesneriaceae
|
| CYAL4 | Cyrtandra �alnea St. John (pro sp.) | | Gesneriaceae
|
| CYAM4 | Cyrtandra �ambigua (Hbd.) St. John & Storey (pro sp.) | | Gesneriaceae
|
| CYAR8 | Cyrtandra arcuata St. John | Cyrtandra kaalae | Gesneriaceae
|
| CYAR9 | Cyrtandra arguta (Gray) C.B. Clarke | Cyrtandra waihoiensis | Gesneriaceae
|
| CYAT2 | Cyrtandra �atomigyna St. John & Storey (pro sp.) | | Gesneriaceae
|
| CYAX | Cyrtandra �axilliflora St. John & Storey (pro sp.) | | Gesneriaceae
|
| CYBA4 | Cyrtandra baccifera C.B. Clarke | Cyrtandra platyphylla | Gesneriaceae
|
| CYBA5 | Cyrtandra �basipartita St. John (pro sp.) | | Gesneriaceae
|
| CYBE | Cyrtandra begoniifolia Hbd. | Cyrtandra platyphylla | Gesneriaceae
|
| CYBI3 | Cyrtandra biserrata Hbd. | Molokai cyrtandra | Gesneriaceae
|
| CYBR3 | Cyrtandra brevicalyx (Hbd.) St. John | Cyrtandra paludosa var. paludosa | Gesneriaceae
|
| CYBR4 | Cyrtandra brevicornuta St. John | Cyrtandra hawaiensis | Gesneriaceae
|
| CYBR5 | Cyrtandra bryanii St. John & Storey | Cyrtandra lessoniana | Gesneriaceae
|
| CYCA8 | Cyrtandra calpidicarpa (Rock) St. John & Storey | valley cyrtandra | Gesneriaceae
|
| CYCA9 | Cyrtandra calycoschiza (St. John & Storey) St. John | Cyrtandra hawaiensis | Gesneriaceae
|
| CYCA10 | Cyrtandra campaniformis St. John | Cyrtandra laxiflora | Gesneriaceae
|
| CYCA11 | Cyrtandra �carinata St. John & Storey (pro sp.) | | Gesneriaceae
|
| CYCA12 | Cyrtandra �caudatisepala St. John (pro sp.) | | Gesneriaceae
|
| CYCA13 | Cyrtandra �caulescens Rock (pro sp.) | | Gesneriaceae
|
| CYCH2 | Cyrtandra charadraia St. John | Cyrtandra kalihii | Gesneriaceae
|
| CYCH3 | Cyrtandra chartacea St. John & Storey | Cyrtandra forbesii | Gesneriaceae
|
| CYCH4 | Cyrtandra �christophersenii St. John & Storey (pro sp.) | | Gesneriaceae
|
| CYCL | Cyrtandra �cladantha Skottsberg (pro sp.) | | Gesneriaceae
|
| CYCO6 | Cyrtandra collarifera St. John & Storey | Cyrtandra kalihii | Gesneriaceae
|
| CYCOC2 | Cyrtandra confertiflora (Wawra) C.B. Clarke var. confertiflora | lava cyrtandra | Gesneriaceae
|
| CYCOO | Cyrtandra confertiflora (Wawra) C.B. Clarke var. obovata (Wawra) C.B. Clarke | lava cyrtandra | Gesneriaceae
|
| CYCO7 | Cyrtandra confertiflora (Wawra) C.B. Clarke | lava cyrtandra | Gesneriaceae
|
| CYCO8 | Cyrtandra �conradtii Rock (pro sp.) | | Gesneriaceae
|
| CYCOB | Cyrtandra cordifolia Gaud. var. brevipilita St. John | Cyrtandra cordifolia | Gesneriaceae
|
| CYCOG | Cyrtandra cordifolia Gaud. var. gynoglabra Rock | Cyrtandra platyphylla | Gesneriaceae
|
| CYCO9 | Cyrtandra cordifolia Gaud. | heartleaf cyrtandra | Gesneriaceae
|
| CYCO10 | Cyrtandra cornuta St. John | Cyrtandra calpidicarpa | Gesneriaceae
|
| CYCR7 | Cyrtandra �crassifolia (Hbd.) Rock (pro sp.) | | Gesneriaceae
|
| CYCR3 | Cyrtandra �crassior St. John & Storey (pro sp.) | | Gesneriaceae
|
| CYCR4 | Cyrtandra crenata St. John & Storey | Kahana Valley cyrtandra | Gesneriaceae
|
| CYCU2 | Cyrtandra �cupuliformis St. John & Storey (pro sp.) | | Gesneriaceae
|
| CYCY3 | Cyrtandra cyaneoides Rock | mapele | Gesneriaceae
|
| CYDE3 | Cyrtandra degenerans (Wawra) Heller | Cyrtandra hawaiensis | Gesneriaceae
|
| CYDE4 | Cyrtandra dentata St. John & Storey | mountain cyrtandra | Gesneriaceae
|
| CYEL2 | Cyrtandra ellipticifolia St. John | Cyrtandra rockii | Gesneriaceae
|
| CYEL3 | Cyrtandra elliptisepala St. John | Cyrtandra lessoniana | Gesneriaceae
|
| CYEL4 | Cyrtandra elstonii Hochr. | Cyrtandra kauaiensis | Gesneriaceae
|
| CYFE5 | Cyrtandra �ferrocolorata St. John (pro sp.) | | Gesneriaceae
|
| CYFE6 | Cyrtandra �ferruginosa St. John & Storey (pro sp.) | | Gesneriaceae
|
| CYFI5 | Cyrtandra filipes Hbd. | gulch cyrtandra | Gesneriaceae
|
| CYFO2 | Cyrtandra �forbesii St. John & Storey | | Gesneriaceae
|
| CYFO3 | Cyrtandra fosbergii St. John & Storey | Cyrtandra atomigyna | Gesneriaceae
|
| CYFR3 | Cyrtandra frederickii St. John & Storey | Cyrtandra dentata | Gesneriaceae
|
| CYFU5 | Cyrtandra fusiformis St. John & Storey | Cyrtandra hawaiensis | Gesneriaceae
|
| CYGA | Cyrtandra garberi St. John | Cyrtandra paludosa var. paludosa | Gesneriaceae
|
| CYGA2 | Cyrtandra garnotiana Gaud. | hahala | Gesneriaceae
|
| CYGAM | Cyrtandra gayana Heller var. macrocarpa Skottsberg | Cyrtandra longifolia | Gesneriaceae
|
| CYGA3 | Cyrtandra gayana Heller | Cyrtandra longifolia | Gesneriaceae
|
| CYGE | Cyrtandra �georgiana Forbes (pro sp.) | | Gesneriaceae
|
| CYGI3 | Cyrtandra giffardii Rock | forest cyrtandra | Gesneriaceae
|
| CYGL4 | Cyrtandra glauca Drake | Cyrtandra paludosa var. paludosa | Gesneriaceae
|
| CYGR4 | Cyrtandra gracilis Hbd. ex C.B. Clarke | Palolo Valley cyrtandra | Gesneriaceae
|
| CYGR5 | Cyrtandra grandiflora Gaud. | largeflower cyrtandra | Gesneriaceae
|
| CYGRL | Cyrtandra grayana Hbd. var. lanaiensis Rock | Cyrtandra grayana | Gesneriaceae
|
| CYGRL2 | Cyrtandra grayana Hbd. var. latifolia Hbd. | Cyrtandra grayana | Gesneriaceae
|
| CYGRL3 | Cyrtandra grayana Hbd. var. linearifolia Rock | Cyrtandra grayana | Gesneriaceae
|
| CYGRN | Cyrtandra grayana Hbd. var. nervosa Rock | Cyrtandra grayana | Gesneriaceae
|
| CYGR6 | Cyrtandra grayana Hbd. | Pacific cyrtandra | Gesneriaceae
|
| CYGR12 | Cyrtandra grayi C.B. Clarke | Gray's cyrtandra | Gesneriaceae
|
| CYGR7 | Cyrtandra grossecrenata St. John & Storey | Cyrtandra hillebrandii | Gesneriaceae
|
| CYHA2 | Cyrtandra halawensis Rock | toothleaf cyrtandra | Gesneriaceae
|
| CYHA3 | Cyrtandra hashimotoi Rock | Maui cyrtandra | Gesneriaceae
|
| CYHA4 | Cyrtandra hawaiensis C.B. Clarke | Hawai'i cyrtandra | Gesneriaceae
|
| CYHE4 | Cyrtandra hematos St. John | singleflower cyrtandra | Gesneriaceae
|
| CYHI3 | Cyrtandra hii Forbes | Cyrtandra pickeringii | Gesneriaceae
|
| CYHI6 | Cyrtandra �hillebrandii Oliver | | Gesneriaceae
|
| CYHI4 | Cyrtandra hirsutula St. John & Storey | Cyrtandra lessoniana | Gesneriaceae
|
| CYHO2 | Cyrtandra hobdyi St. John | Cyrtandra kauaiensis | Gesneriaceae
|
| CYHO3 | Cyrtandra �honolulensis Wawra (pro sp.) | | Gesneriaceae
|
| CYHO4 | Cyrtandra �hosakae St. John & Storey (pro sp.) | | Gesneriaceae
|
| CYHY3 | Cyrtandra hyperdasa St. John | Cyrtandra paludosa var. paludosa | Gesneriaceae
|
| CYIN | Cyrtandra infrapallida St. John | Cyrtandra laxiflora | Gesneriaceae
|
| CYIN2 | Cyrtandra infundibuliformis St. John | Cyrtandra hawaiensis | Gesneriaceae
|
| CYIN3 | Cyrtandra intonsa St. John & Storey | Cyrtandra garnotiana | Gesneriaceae
|
| CYIN4 | Cyrtandra intrapilosa St. John | Cyrtandra lessoniana | Gesneriaceae
|
| CYIN5 | Cyrtandra intravillosa St. John & Storey | Cyrtandra hawaiensis | Gesneriaceae
|
| CYKA | Cyrtandra �kaalae St. John & Storey (pro sp.) | | Gesneriaceae
|
| CYKA2 | Cyrtandra �kahanaensis St. John & Storey (pro sp.) | | Gesneriaceae
|