GLOSSARY. 
XXV 
Rachis ; the central stem of some kinds of inflorescence ; as 
the stalk common to several spikelets of Grasses ; the 
stalk of the frond of Ferns above the lowest pinnae. 
Radiate jiowers ; those at the margin of a head or other 
inflorescence which are long and spreading like rays. 
Radical ; springing from just above the root. 
Radicle ; the end of the embryo from which the root grows ; 
also small roots. 
Raphides ; minute needle-shaped crystals found in the cells of 
some plants. 
Rays (see Radiant) ; parts diverging in a circle from a central 
point. 
Receptacle; the dilated top of the stalk bearing the flowers 
in Composites ; the common support of the parts of a 
flower. 
Recliruite and reclining ; curved downwards. 
Recurved ; bent moderately backwards. 
Reflexed ; bent considerably backwards. 
Reniform ; transversely oval, but broadly cordate at the base. 
Repand ; with a rather wavy margin. 
Reticulate; forming a network. 
Retrorse ; directed from the point of an organ. 
Retuse : abruptly blunt with a notch in the middle. 
Revolute ; rolled back, as towards the underside of a leaf. 
Rhizomatous ; having rhizomes. 
Rhizome ; a prostrate more or less subterranean stem pro- 
ducing roots and leafy shoots. 
Rhomhoidal ; approaching a quadrangular, not square, figure 
attached by one of its more acute angles. 
Ringent ; a 2-lipped widely open corolla. 
Rootstock ; a thick short rhizome or tuber. 
Rosette \ a collection of leaves growing close together, like the 
petals of a double rose. 
Rosulate ; arranged in a rosette. 
Rotate ; a monopetalous corolla with a short tube and very 
spreading limb. 
Rudimentary ; imperfectly developed. 
Rugose; covered with a network of lines enclosing convex 
spaces. 
Rugulose ; finely rugose. 
Runcinate ; where the lobes of leaves are directed towards the 
base. 
Runner ; a prostrate shoot rooting at its end ; a stole. 
Sagittate ; like the barbed head of an arrow, the auricles or 
lobes pointing backwards. 
