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An alphabetical listing of General terms and items. A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Raceme   A simple inflorescence in which the flowers are pedicellate and arranged singly along an elongate axis. Racemiform   Resembling a raceme; or an adjective describing a raceme. Racemose   Having flowers in racemes. Rachilla   A secondary rachis. Rachis   The principal axis of an inflorescence or compound leaf. Radially Symmetrical   Actinomorphic; capable of being bisected into two or more similar planes. Same as regular. Radiate   Spreading in all directions. Radical Leaves   Leaves that rise directly from the rootstock. Ranked   Ordered in a series, usually used with a number, such as two-ranked. Ray   A strap-shaped, ligulate, typically marginal, flower in the head of a composite inflorescence; also one of the principal branches of an umbellate or cymose inflorescence. Ray Flower   A strap-shaped, ligulate, typically marginal, flower in the head of a composite inflorescence. Also called ligulate flower. Compare to disk flower. Receptacle   An enlarged or elongated end of a pedicel, peduncle, or scape on which some or all of the flower parts are borne, such as in the Asteraceae family or certain genera in the Rosaceae family. Recurved   Directed backward or downward. Reflex   Bent or turned back. Reflexed   Abruptly turned or bent downward. Regular   Radially symmetrical, capable of being bisected into two or more similar planes. See actinomorphic. Remotely   Distantly; far apart. Reniform   Kidney-shaped. Repand   Typically with a shallowly, unevenly lobed or sinuate margin. Repent   Prostrate, creeping along the ground, typically applying to those plants which root at the nodes. Back to top Resinous   Appearing to secrete or exude resin. Resupinate   Literally oriented upside down. Reticulate   Forming a network of interconnecting veins. Retrorse   Directed backward or downward. Retuse   Notched slightly at an usually obtuse apex. Revolute   Referring to margins which tend to roll back toward the lower surface of the midrib of a foliar structure. Rhizomatous   Bearing rhizomes. Rhizome   An underground stem, typically horizontal. Rhombic   A four-sided, typically obliquely angled, shape. Rhomboidal   A solid with a rhombic outline. Riparian   Growing along rivers; pertaining to rivers. Rootstock   Same as a rhizome; or the root system to which a scion is grafted. Roseate   Rose-colored. Rosette   Referring to a dense cluster of basal leaves, particularly with reference to winter annuals or biennials, or to scapose plants in which all the leaves are basal. Rostellar   Pertaining to the little beak, or rostellum, found in some orchid flowers such as Goodyera. Rostrate   Beaked. Rosulate   Turning outward and downward, such as in the petals of a double rose. Rotate   Pertaining to corollas which are more or less flat and circular in general outline; wheel-like. Rudimentary   Primitive; poorly developed. Rufescent, Rufous   Reddish-brown. Back to top Rugose   Wrinkled. Rugulose   Minutely rugose. Runcinate   Coarsely and sharply cut or incised, the principal divisions typically directed backward, typified by the leaf of a dandelion. Runner   A filiform or very slender stolon. Back to top