Flora of North America Glossary
Displaying 1976-2000 of 2673
| Term | Synonyms | Category | Limitation | Definition |
|---|---|---|---|---|
| rostellate | = small-beaked | apex | Diminutively rostrate (beaked). | |
| rostellum 1 pl. rostella | = beaklet | STRUCTURE | A small rostrum (beak). | |
| rostellum 2 pl. rostella | = beaklet | STRUCTURE | A sterile excrescent stigma lobe protruding between the anther and the functional stigma lobes of a column; sometimes forming one or more viscidia at pollinium maturity; esp. in Orchidaceae. | |
| rostrate | = beaked | apex | Terminating in a relatively long, tapering, more or less rigid point. See also rostellate (small-beaked). | |
| rostrum 1 pl. rostra | = beak | STRUCTURE | A relatively long, tapering, more or less rigid and pointed enation or termination. | |
| rostrum 2 pl. rostra | = beak | STRUCTURE | The inner, horn-like segment of a coronal lobe; esp. in Asclepiadaceae. | |
| rosulate | = rosetted | arrangement | leaves | Forming a rosette; strongly congested and disposed radially about the main stem at or very near its base, seeming to arise at the same level and often overlapping laterally; esp. in perennial herbs. |
| rotate | = wheel-shaped | solid shape | perianth, calyx, corolla | Having a very short, cupulate tube and a broad, divergent to divaricate limb; Resembling a wheel when viewed from the distal end. |
| rotund | = globose, globular, orbicular, spheric(al), spheroid(al) | solid shape | Uniformly convex, circular in any median section and in outline when viewed from any angle; like a sphere or globe. | |
| rough 1 | = scabrous | pubescence | Of or bearing coarse, stiff, ascending, trichomes and markedly rough to the touch. | |
| rough 2 | = scabrate, scabrid, scabridous, scabrous | relief | Having small, stout, stiff, more or less acute protrusions. | |
| round | = orbiculate, orbicular misapplied | plane shape | Circular. | |
| rounded | apex | Convex overall and more or less regularly curved. | ||
| rounded | base | Convex overall and more or less regularly curved. | ||
| rubiaceous | = paracytic | architecture | stomate | Having one or more subsidiary cells to either side, all oriented parallel to its long axis. |
| rudimentary | = obsolete (not recommended); > vestigial | manifestation | Not developing fully and not functional compared with corresponding structures in other taxa. | |
| rugose | = corrugate, wrinkled | relief | Having irregular, narrow ridges or creases, the intervening areas flat to shallowly concave or convex, appearing overall as though crumpled and then spread out. See also rugulose. | |
| rugulose | relief | Slightly or finely rugose (corrugate, wrinkled). | ||
| ruminate | = chewed | relief | Irregularly convoluted, as if chewed. | |
| runcinate | plane shape | Basically obovate with a series of retrorse, acute lobes on either side, these diminishing in size toward the base. | ||
| runner | = stolon | STRUCTURE | A slender stem that grows horizontally upon or just beneath the ground surface, rooting at the nodes and giving rise to erect shoot segments at some nodes and/or at its apex. | |
| runnering | = sarmentose, stoloniferous | architecture | plant | Producing runners (stolons), by means of which it propagates vegetatively. |
| saccate 1 | = alate, vesiculate, winged | architecture | pollen grain | Having lateral lobes or enations resembling sacs or somewhat inflated wings. |
| saccate 2 | = bag-shaped, pouch-shaped, sack-shaped | solid shape | Irregularly obovoid with an exterior aspect intermediate between inflated and flaccid; like a closed pouch or bag. | |
| sack-shaped | = bag-shaped, pouch-shaped, saccate | solid shape | Irregularly obovoid with an exterior aspect intermediate between inflated and flaccid; like a closed pouch or bag. |
Displaying 1976-2000 of 2673