INDEX AND GLOSSARY 



269 



Kadical. Belonging to or proceeding from 

 the root or base of the stem near the 

 ground. 



Eadicle. The initial root of the embryo. 

 Less properly, the stem of the embryo ; 

 below the cotyledons (caulicle). 20. 



Kameal. Belonging to a branch. 



Ramification. Branching. 



Raphe, 153. 



Eay. The branch of an umbel ; the marginal 

 flowers of an inflorescence when distinct 

 from the disk. 



Receptacle. The more or less expanded or 

 produced portion of an axis which bears 

 the organs of a flower (the torus), or the 

 collected flowers of a head. 112. 



Recurved. Curved downward or backward. 



Red Algae, 159. 



Reduplicate, 188. 



Reflexed. Abruptly bent or turned down- 

 ward. 



Regular. Uniform in shape or structure. 

 128. 



Reniform. Kidney-shaped. 93. 



Repand. With a slightly uneven and some- 

 what sinuate margin. 95. 



Reproduction, 174 ; asexual, 183 ; carpospo- 

 ric, 1S2 ; oosporic, 182 ; sexual, 183 ; zygo- 

 sporic, 182. 



Resiniferous. Producing resin. 



Respiration (Exp. 2), 10, 236 ; in leaves, (Exp. 

 12), 66 ; in germination, 20. 



Resting periods, 238 ; in buds, 80 ; seeds, 19. 



Reticulate. In the form of network; net- 

 veined. 77. 



Retrorse. Directed back or downward. 



Retuse. With a shallow notch at a rounded 

 apex. 94. 



Revolute. Rolled backward from the mar- 

 gins or apex. 



Rhachis. The axis of a spike or of a com- 

 pound leaf. 70. 



Rhizome. Any prostrate or subterranean 

 stem, usually rooting at the nodes and be- 

 coming erect at the apex. 50, 59. 



Rhizopus, 160, 186. 



Rhombic, Rhomboidal. Somewhat lozenge- 

 shaped ; obliquely four-sided. 



Rib. A primary or prominent vein of a leaf. 

 77. 



Ringent. Gaping, as the mouth of an open 

 bilabiate corolla. 133. 



Rockweed, 158, 178. 



Root, anatomy, 229 ; conduction (Exp. 7), 85 ; 

 geotropism, 11 ; gross anatomy, 84; grow- 

 ing point, 89 ; laboratory studies, 84 ; pri- 

 mary, 36 ; origin, 36. 



Root cap, 39. 



Root hairs, 22 ; action of, 88. 



Root pressure, 233 ; (Exp.), 35 ; (Exp.), 249. 



Roots, absorption, 37 ; adventitious, 87 ; 

 aerial, 39 ; as holdfasts, 42 ; climbing, 85, 

 42 ; duration of, 44 : for storage, 43 ; func- 

 tions, 37 ; growth (Exp.), 249 ; origin of 

 new, 229 ; parasitic, 40 ; storage, 85. 



Rootstock. Same as Rhizome. 59. 



Rostrate. Having a beak or spur. 



Rosulate. In the form of a rosette. 



Rotate (corolla). W heel- shaped ; flat and 

 circular in outline. 181. 



Rotund. Rounded in outline. 



Rudiment. A very partially developed or- 

 gan ; a vestige. 



Rudimentary. But slightly developed. 



Rufous. Reddish brown. 



Rugose. Wrinkled. 



Runcinate. Sharply incised, with the seg- 

 ments directed backward. 



Runner. A filiform or very slender stolon. 

 58. 



Rusts, 192. 



Saccate. Sac-shaped. 



Sac, embryo, 118 ; pollen, 108 ; fungi, 190. 



Sagittate. Shaped like an arrowhead, the 



basal lobes directed downward. 93. 

 Salver-shaped (corolla). Having a slender 



tube abruptly expanded into a flat limb. 



131. 



Samara. An indebiscent, winged fruit. 150. 

 Sap, ascent of (Exp. 8), 49, 288. 

 Saprolegniaceae, 188. 

 Saprophytes, 39. 

 Scabrous. Rough to the touch. 

 Scape. A peduncle rising from the ground, 



naked or without proper foliage. 

 Scapose. Bearing or resembling a scape. 

 Scarious. Thin, dry, and membranaceous, 



not green. 

 Sclerotic cells, 220. 

 Scorpioid (inflorescence). Circinately coiled 



while in the bud. 143. 

 Seed, 152; appendages, 155; ecology, 158; 



origin, 15 ; processes leading to formation 



of, 116 ; study of, 7, 145. 

 Seed coats, how removed by seedling, 22. 

 Seedlings, development, 12, 20. 

 Seed plants, 14. 

 Seed rudiments (ovules), 15. 

 Seeds, dispersal, 158; ejected, 155; from 



mummy cases, 19 ; in forest soil, 19 ; rest- 

 ing state, 19 ; store of food, 19 ; vitality, 



19. 

 Segment. One of the parts of a leaf or other 



like organ thaj is cleft or divided, 96. 

 Selaginella, 166, 207. 

 Self-fertilization. 118 ; prevented, 119. 

 Sensitive Plant (Exp. 19), 68. 

 Sepal. A division of a calyx. 110. 

 Septicidal (capsule). Dehiscing through the 



partitions and between the cells. 151. 

 Septifragal. The valves breaking from the 



septa in dehiscence. 151. 

 Septum. Any kind of partition. 

 Sequoias, 63. 



Serrate. Having teeth pointing forward. 94. 

 Serrulate. Finely serrate. 

 Sessile. Without footstalk of any kind. 

 Setaceous. Bristlelike. 

 Setose. Beset with bristles. 



