A GLOSSARY OF BOTANICAL TERMS 43 



REFLEXED, bent back. 



REGULAR, divided equally. 



RENIFORM, kidney-shaped or bean-shaped. 



RETICULATED, like a network. 



RETUSE, very obtuse or truncate and slightly indented. 



RHIZOME, a creeping, prostrate underground stem, bearing erect 



or sometimes prostrate shoots. 

 RINGENT, strongly 2-lipped and gaping. 

 ROOTSTOCK, the rhizome ; or the crown of the root. 

 ROSETTE, a somewhat circular group of leaves arranged in a close 



and spreading manner, often flat on the ground ; e.g. Ramondia. 

 ROSTRATE, beaked. 

 RUGOSE, wrinkled. 

 RUNCINATE, pinnatifid, with the lobes pointing backwards ; e.g. 



a Dandelion leaf. 

 RUNNER, a slender, prostrate, and generally rooting stem-branch. 



SAGITTATE, arrow-shaped. 



SCABROUS, rough to the touch. 



SCALE, a thin, disc-like growth on the exposed surface of some 

 leaves and stems. 



SCAPE, a naked flower-stem springing direct from the root and 

 bearing a single flower. 



SCARIOUS, thin and more or less transparent and not green ; 

 scaly. 



SEED, a fertilised ovule. 



SEPAL, one of the calyx-leaves. 



SERRATE, edged like a saw. 



SESSILE, stemless. 



SETACEOUS, like a bristle. 



SHRUB, a woody perennial plant without a main trunk. 



SILICULE, a short seed-pod in Cruciferous plants, such as Draba ; 

 adj. Siliculose. 



SILIQUA, a linear seed-pod in Cruciferous plants, such as Wall- 

 flower ; adj . Siliquose. 



SINUOUS or SINUATE, wavy ; when teeth on the margin of a leaf 

 are broad and irregular. 



SPADIX, a fleshy spike, as in Arum maculatum. 



SPATHE, a sheath-like leaf enveloping a flower, as in Arum. 



SPATHULATE, broadened in the short upper half and narrowly con- 

 tracted below. 



SPECIES, a unit of a genus of greater or less affinity. 



SPERMATOPHYTES, seed-plants. 



SPIKE, a simple inflorescence of sessile flowers attached to a simple 

 axis. 



SPORES, the powdery grains of Mosses, Ferns, etc., which corre- 

 spond to the ' seeds ' in flowering plants. 



