A GLOSSARY OF BOTANICAL TERMS 43 



Reflexed, bent back. 



Regular, divided equally. 



Reniform, kidney-shaped or bean-shaped. 



Reticulated, Hke 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-hpped 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, hke 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 i)elow. 



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



Spermatophytes, seed-plants. 



Spike, a siniple 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. 



