habit: the general appearance or manner of growth of a plant.

habitat: the environmental conditions or kind of place in which a plant grows.

halophyte (4 images): a plant adapted to growth in salty soil.

hamate (4 images): hooked at the tip.

haplostemonous (8 images): with a single cycle of stamens.

hastate (8 images): shaped like an arrowhead, but with the lobes more divergent.

haustorium: root-like organ of parasitic plants for extracting water and nutrients from host plants.

head (17 images): an inflorescence of sessile or subsessile flowers crowded closely together at the tip of a peduncle.

helicoid cyme (6 images): a sympodial cyme with the apparent main axis curved in more or less of a helix.

herb (14 images): a plant, either annual, biennial, or perennial, with the stems dying back to the ground at the end of the growing season.

herbage (4 images): the stems and leaves, collectively.

herbaceous (3 images): adjectival form of herb; also, lflike in color or texture, or not woody.

heteromycotrophic (9 images): symbiotic nutritional relationship between some plants and fungi.

heterosporous: producing 2 different kinds of spores, generally very unequal in size.

heterostylous (2 images): outcrossing mechanism whereby flower style lengths vary among plants in a population (see distyly).

heterotrophic (6 images): parasitic or heteromycotrophic.

hilum: the scar on a seed at its point of attachment.

hirsute (7 images): pubescent with rather coarse or stiff but not pungent hairs.

hirsutulous (3 images): diminutive of hirsute.

hirtellous (3 images): diminutive of hirsute.

hispid (25 images): pubescent with coarse and firm, often pungent hairs.

hispidulous (2 images): minutely hispid.

homosporous: producing only 1 kind of spore.

homostylous: flower styles of equal lengths among individuals of a population.

hyaline (9 images): thin and transparent or translucent.

hydathode (3 images): an opening, typically on a leaf, for excreting water.

hydrophyte (4 images): a plant adapted to life in water.

hypanthium (10 images): a ring or cup around the ovary, generally formed by the union of the lower parts of the calyx, corolla, and androecium; when the petals and stamens appear to arise from the calyx tube, the hypanthium is that part of the apparent calyx tube that is below the attachment of the petals.

hypogeous: belowground, often referring to location of cleistogamous flowers.

hypogynous: with perianth and stamens attached directly to the receptacle.