Flora of North America Glossary
Displaying 1901-1925 of 2673
| Term | Synonyms | Category | Limitation | Definition |
|---|---|---|---|---|
| …ranked | = …stichous | arrangement | Disposed along the axis in the number of distinct ranks indicated by the prefix; as in two-ranked. | |
| ranunculaceous | = anomocytic | architecture | stomate | Lacking subsidiary cells. |
| raphal | derivation | aril | Produced or resulting from a modification of the raphe. | |
| raphe | STRUCTURE | That portion of the funicle adnate to the integument of an anatropous ovule; represented by a longitudinal ridge or other discontinuity in the surface and/or color of the testa on one side of the mature seed. | ||
| raphides sing. raphis | STRUCTURE | Needle-like crystals of calcium oxalate contained within the cells of some plants; esp. in Araceae. | ||
| ray 1 | < primary axis | STRUCTURE | A first-order axis within a compound umbel. | |
| ray 2 | = lamina | STRUCTURE | The distal, relatively flat portion of the corolla of a ray floret, terminating in 0--4 teeth or lobes; in Asteraceae (Compositae). | |
| ray floret | STRUCTURE | A floret that has a zygomorphic corolla, is pistillate (either fertile or sterile) or neuter, and is borne in a radiate capitulum (head) peripheral (proximal) to the disc florets; in Asteraceae (Compositae). | ||
| receptacle 1 | = torus | STRUCTURE | The relatively short, simple, axial structure surmounting a pedicel and basal to the flower, usually broader than the pedicel. | |
| receptacle 2 | = torus | STRUCTURE | The short, expanded, compound axial structure surmounting a peduncle and basal to two or more flowers, or to the florets of a capitulum (head) in Asteraceae (Compositae), where it may bear paleae (receptacular bracts), scales, bristles, trichomes, or subulate enations, and may be smooth or variously pitted (alveolate, foveolate). | |
| receptacular | insertion | Upon, arising from, or otherwise directly associated with the receptacle. | ||
| receptacular | position | Upon, arising from, or otherwise directly associated with the receptacle. | ||
| receptacular bract | = pale, palea, palet | STRUCTURE | A small papery (chartaceous) to membranous bract borne on the compound receptacle (torus) of a capitulum (head) in Asteraceae (Compositae). | |
| reclinate | vernation | Each with its blade oriented downward and parallel to the proximal portion of its distally recurved petiole. | ||
| reclining | habit | axis | Inserted above substrate level and recurved, the distal portion procumbent. | |
| rectangular | plane shape | Basically four-sided, the sides more or less straight, those of each opposing pair more or less parallel, the generalized angles between adjacent sides approximately 90°. | ||
| recurved | = arching | orientation | Curving outward (abaxially), downward, or backward. | |
| reduced | size | Unusually or unexpectedly small. | ||
| reflectance | CHARACTER | Aspect as to proportion and pattern of incident light reflected from the surface. | ||
| reflexed | = deflexed | orientation | Abruptly bent outward (abaxially), downward, or backward at some point along its length. | |
| regular | = actinomorphic | architecture | perianth, calyx, corolla | Radially symmetric; divisible into two essentially equal portions along any median longitudinal plane. See also peloric. |
| relief | = sculpture | CHARACTER | General topographic aspect of a surface. Overlaps conceptually with solid shape. | |
| remote | = distant | arrangement | Disposed relatively far from one another along the axis. | |
| reniform 1 | = kidney-shaped | plane shape | Broadly elongate and arcuate, each end bluntly rounded; like the generalized outline of the broad face of a human kidney. | |
| reniform 2 | = kidney-shaped | solid shape | Thickly elongate and arcuate, circular or compressed-circular in transverse section, each end bluntly rounded; like the generalized shape of a human kidney. |
Displaying 1901-1925 of 2673