Flora of North America Glossary
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| Term | Synonyms | Category | Limitation | Definition |
|---|---|---|---|---|
| imbricate(d) 2 | = overlapping | arrangement | planate structures | Overlapping one another laterally and/or longitudinally. |
| immersed | < sunken | prominence | Deeply sunken. | |
| imparipinnate | = odd-pinnate | architecture | foliaceous structure | Compound with each order pinnate and comprising an uneven number of members, one of them terminal. |
| imperfect | architecture | flower | Having either stamens or pistils absent or non-functional, thus unisexual. | |
| impressed | < sunken | prominence | Shallowly sunken. | |
| inaperturate | architecture | pollen grain | Lacking an aperture of any type. | |
| incised | = cut, lacerate, torn; > laciniate, slashed | plane shape | Having straight to irregular lines of separation extending inward from the margin. See also cleft (dissected, divided, lobate, lobed, parted, partite, segmented). | |
| inclinate | = declinate | orientation | Bent or curved downward or forward. | |
| inclined | = declined | orientation | Directed downward or backward. | |
| included | position | anther, style | Not protruding beyond the floral envelope. See also exsert(ed). | |
| inconspicuous | manifestation | Not prominently evident. | ||
| incumbent 1 | = notorhizal | arrangement | cotyledons | Adaxially contiguous and together oppositely parallel to the hypocotyl and radicle, the abaxial surface of one lying against them. |
| incumbent 2 | orientation | anther | Oppositely parallel to the filament on the adaxial side of the latter. | |
| incurved | orientation | Curving adaxially. See also decurved. | ||
| indehiscent | dehiscence | Not splitting or forming an aperture at maturity, the contents being released for dispersal only after decay, digestion, or erosion of the structure. | ||
| indeterminate | development | Having the lateral (peripheral, basal, or proximal) portions differentiating first and the terminal (central, apical, or distal) portion later, development thus proceeding sequentially upward or inward. | ||
| indument | STRUCTURE / SUBSTANCE | See indumentum. | ||
| indumentum pl. indumenta var. indument | = vesture | STRUCTURE / SUBSTANCE | The trichomes and/or exuded substance that overlie a surface proper, regarded collectively. See also coating, pubescence. | |
| induplicate | aestivation | Basically valvate but with each member involute, the lateral abaxial surfaces of adjacent members contiguous. | ||
| indurate(d) | = hard | texture | Yielding only under strong pressure; not deformable without internal structural disruption. See also callose (callous), corticate (hard-coated), sclerocaulous (hard-stemmed). | |
| indusiate | architecture | sorus | Having an indusium. | |
| indusium pl. indusia | STRUCTURE | A protective membrane that is an outgrowth from the epidermis and covers a sorus during its maturation; in Polypodiophyta. | ||
| inferior 1 | insertion | indusium | Inserted at the base of the sorus. | |
| inferior 2 | position | ovary | Wholly enclosed by a floral tube casing, the distal portions of the perianth and/or androecium thus arising from its apex. | |
| inflated | solid shape | Relatively thin-walled with an essentially empty interior largely enclosed by the walls, which are convex overall and appear taut, as though from internal pressure. See also swollen (turgid, tumid), which is not clearly distinct in its application. |
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