Jones: Flora of Illinois 365 



Regular (flowt-r). See Actinoniorphic. 



Reniform. Kidney-shaped; having the width greater than the length, and 



a wide sinus at the base. 

 Repand. With a sUghtly sinuate margin. 

 Reticulate. In the form of a network; net-\eined. 

 Retrorse. Turned backward or downward. 

 Retuse. Slightly notched at the rounded apex. 

 Revolute. Rolled backward from the margin or apex. 

 Rhizome. A more or less elongated, usually underground, horizontal or 



ascending stem modified for food storage and asexual reproduction. 

 Rhombic. Having the shape of a rhomb; oval, but somewhat angular at the 



sides; obliquely four-sided. 

 Rotate (corolla). Wheel-shaped; with a fiat and circular limb, and a very 



short tube. 

 Rugose. Wrinkled. 

 Rugulose. Minutely rugose. 

 RuNCiNATE. Pinnatifid: cut into sharp triangular lobes, the points directed 



backward. 



Sagittate. Shaped like an arrowhead, with the basal lobes directed down- 

 ward. 

 Salverform (flower). With the slender corolla-tube abruptly expanded in 



a flat limb. 

 Samara. A dry indehiscent, one-seeded, winged fruit, such as that of elm, 



ash, or maple. 

 Saprophyte. A plant which derives its food from non-living organic matter. 

 Scabrellous. See Scabrid. 

 ScABRiD. Slightly rough to touch. 

 Scabrous. Rough to the touch. 

 Scale. A tenn applied to se\eral kinds of small usually appressed leaves or 



bracts. 

 Scape. A leafless peduncle arising from the ground; it may bear scales or 



bracts, and may be one- or several-flowered. 

 Scapiform. Scape-like; having the form of a scape. 

 ScAPOSE. Having a scape. 



ScARious. Dry. thin, scale-like; membranous; not green. 

 ScoRPioiD. Applied to inflorescences which are circinately coiled in the bud, 



unrolling as the flowers expand, as in Boraginaceae. 

 Secund. Turned to one side, as the flowers of an inflorescence. 

 Sepal. One of the parts or lobes of a calyx. 

 Septate. Divided by septa, or partitions. 

 Septicidal. Dehiscing along or in the partitions; said of a fruit that opens 



between the locules. 

 Septum. A partition. 



Sericeous. Silky; pubescent with soft, shining, usually appressed hairs. 

 Serrate. Saw-toothed; having small, forwardly-directed sharp teeth on the 



margin. 

 Serrulate. Finely serrate. 

 Sessile. Not stalked. 

 Setaceous. Bristle-like. 

 Setose. Beset with bristles. 

 Setilose. Finely setose. 



