| Abbreviation | Definition |
|---|---|
| GSOR | Genetic Stocks - ORyza |
| GSWP | Global Soil Wetness Project |
| GV | Gentian Violet |
| GVB | Gallatin Valley Botanical |
| HB | Hordeum Bulbosum |
| HBG | Honolulu Botanical Gardens |
| HBG | Houston Botanic Garden |
| HBOK | Harrow Blood peach x OKinawa peach crossbreed |
| HDB | High Density Biomass |
| HEC | Herbarium Eric Coppejans |
| HH | Highland Heather |
| HLB | HuangLongBing disease |
| HLCB | Height to Live Crown Base |
| HLLT | Hot lol lol too |
| HMS | Hybrid Male Sterility |
| HMS1 | Hybrid Male Sterility type 1 |
| HMS2 | Hybrid Male Sterility type 2 |
| HNIS | Harmful Non-Indigenous Species |
| HOS | Hawaiian Orchid Society |
| HPB | Harvard Papers in Botany |