| Name | Structure/ Category | Description |
|---|---|---|
| Hydrophyte | a vascular plant growing wholly or partly in water; esp a perennial aquatic plant having its overwintering buds under water a plant requiring an abundance of water for growth and growing in water or in soil too waterlogged for most other plants to survive -- compare mesophyte, xerophyte | |
| Hygroscopic | sensitive to moisture induced by moisture | |
| Hypanthium | an enlargement of the usu. cup-shaped receptacle bearing on its rim the stamens, perals, and sepals of a flower and often enlarging and surrounding the fruits (as in the rose hip) | |
| Hypanthium | A cup or tube usually formed by the fusion of the basal parts of the sepals, petals and/or stamens, and on which they are seemingly borne; surrounds the ovary, or ovaries, and may be fused wholly, partly or not at all to them; the shape varies from disc-like to cup shaped, flask-like or tubular; a floral cup. | |
| Hypogynous | [Flowers] {perianth position} | With the perianth (the whorl of sepals and petals) not fused into a floral cup of any kind and arising at the same level as the base of the ovary. |
| Imbricate | (1) [Leaves] {habit} | Overlapping, as the shingles on a roof. |
| Imbricate | (2) [Bud scales] {type} | Overlapping, as the shingles on a roof. |
| Impressed | [Leaf upper surface venation] {relief} | |
| Incised | [Leaf margins, Leaflet margins, Petal margins, Phyllary margins, Sepal margins] {form} | Margins sharply and deeply cut, usually jaggedly. |
| Inconspicuous | [Stipule scars] {presence} | Not readily visible. |
