INDEX. 
Nipadites turgidus, Bowerd., 150, 151. 
umbonatus, Bowerb., 144, 152. 
Niphobolus adnascens, Kaulf., 201, 
Nitraria, 233. 
retusa, 250. 
Nitzschia flexella, Suring., 278. 
linearis, W. Sm., 278. 
minutissima, W. Sm., 278. 
parvula, W. Sm., 278, 
Nostoe humifusum, Ca7m., 269. 
sphericum, Vaucher, 269, 276. 
Nostocacer, 264, 269. 
Nuphar advena, Ait., 469. 
Nyctaginez, 188. 
N ympheea alba, Linn., 469. 
tuberosa, Pazne, 468, 469. 
Nymphezacee, 468. 
Ocellularia crispata, Muell. Arg., 452. 
dilatata, Muell. Arg., 452. 
efformata, 452. 
elabens, Muell. Arg., 452. 
emersella, Muell. Arg., 453. 
Glaziovii, Muell. Arg., 451. 
latilabra, 452. 
pulchra, Muell. Arg., 452. 
schizostoma, Muell. Arg., 451, 452, 
453, 454. 
Ochna multiflora, DC., 477, 
Ochnacex, 477. 
Ochradenus baccatus, 247, 259. 
Ochrosia parviflora, Hens/., 184, 205. 
Ocimum Basilicum, Linn., 188, 
gratissimum, Linn., 188. 
Octoclinis, F. Mueller, 15. 
Odina nigritana, 75. 
Odontidium mutabile, W. Sm., 278. 
Odontolejeunea, 336. 
peruviana, 348, 
Odontoschisma, Dum., 355. 
prostratum, Spruce, 355. 
Olacines, 172, 479. 
Oldenburgia, 34. 
Oldenlandia feetida, Forst., 180, 204. 
paniculata, Linn., 180, 204. 
Oleacese, 86, 184. 
Oligomeris subulata, 247, 259. 
Olneya, 487. 
Omorica, 29. 
Omphalanthus, Lindenb. § Nees, 334. 
filiformis, Nees, 334. 
Onagracee, 125. 
Onagrariex, 496. 
Ononis, 226. 
repens, 223, 224. 
spinosa, Linn., 223. 
, var, horrida, 223. 
, var. inermis, 223, 
, var. repens, 223. 
Onosma, 125. 
551 
Opegrapha angulosa, Muel/, Arg., 
457. 
atratula, Muell. Arg., 456. 
chloroconia, Muell. Arg., 45 
fertilis, Muell, Arg., 456. 
melanogramma, Krempelh., 456. 
palmicola, Muell. Arg., 456. 
rigida, Fée, 462, 
tartarea, Muell. Arg., 457, 
ulcerata, Muell. Arg., 456. 
Ophioglossum pendulum, Linn., 202, 
Ophrys, 252, 
Oplismenus Burmanni, Beauv., 197, 
compositus, Roem. § Schilt., 198, 
207 
Orchide, 194, 382, 
Orchids, 66. 
Orchis, 252. 
Origin of Plant-Structures by Self-Adap- 
tation to the Environment, exem- 
plified by Desert or Xerophilous 
Plants, by G. Henslow, 218. 
Orithyia, sp., 139. 
Ornithogalum Eckloni, Schlecht., 379, 
426. 
Oscillariacer, 264, 273. 
Ostrya, 527. 
carpinifolia, Zorr. § Gray, 527. 
Ouratea, 477 note. 
Oxalis, 59, 475. 
Acetosella, Zinn., 475. 
cernua, 234, 235 note. 
corniculata, Linn., 171, 475, 476. 
floribunda, 475. 
oregana, Nuitt., 476. 
pubescens, H. B. & K., 476. 
purpurata, Jacg., 475. 
stricta, Linn., 475. 
Oxycedrus, Spach, 13. 
Oxygraphis glacialis, 103. 
Oxytropis, 103, 105, 125, 128, 135, 
486 
densa, Benth.?, 111, 128. 
microphylla, DC., 111, 128. 
physocarpa, Ledeb., 111, 128. 
Stracheyana, Benzh., 112. 
tatarica, Jacquem., 112, 128. 
Pachylepis, Brongn., 15. 
Pachysandra, 521. 
procumbens, Michx., 521, 
Peederia, 502. 
Paleokeura, 147, 148, 149. 
Pellegriniana, Massal., 150. 
Palicourea rigida, 229, 
strepitans, 229. 
Paliurus australis, Gaertn., 481. 
Paline, 195. 
