| Name | Structure/ Category | Description |
|---|---|---|
| Habit | The general appearance, characteristic form, or mode of growth of a plant. | |
| Half-inferior | [Ovaries] {position} | With the lower portion of the ovary enclosed by and fused to a floral cup, the whorl of sepals and petals (perianth) and/or stamens (androecium) thus appearing to arise from near the middle of the ovary. |
| Halophyte | a plant that grows naturally in soils having a high content of various salts, that usu. resembles a true xerophyte and that occurs in many families (as Chenopodiaceae, Compositae, Plumbaginaceae) | |
| Hastate | [Leaf bases, Leaflet bases, Leaflets, Leaves] {shape} | Arrowhead-shaped, but with the basal lobes turned outward rather than downward. |
| Head | [Inflorescences] {type} | An inflorescence with crowded, sessile or nearly sessile, small flowers (florets) borne on a common receptacle which is convex or flat and often disc-shaped; characteristic of the family Asteraceae. |
| Helicoid cyme | [Inflorescences] {type} | A cyme in which the lateral branches develop on only one side, all segments branching on the same side, causing the inflorescence to curve or coil. |
| Helophyte | a perennial marsh plant having its overwintering buds under water | |
| Hemi-parasitic | [Plants] {nutrition} | Partially parasitic; in plants, photosynthetic but deriving at least some nutrients from a host organism. |
| Herbaceous | [Plants] {woodiness} | Having little or no living portion of the shoot persisting aboveground from one growing season to the next, the aboveground portion being composed of relatively soft, non-woody tissue. |
| Hesperidium | [Fruits] {type} | A specialized berry with a leathery skin or rind, and a fleshy interior divided into sections or locules, as lemons and oranges (Citrus). |
