Index 



1211 



PAGE 



speciosa 706 



strigosa 705 



tetragona var. longistipata 706 



triloba 707 



triloba var. parviflora 1077 



Oleaceae 752 



Onion, nodding 310 



Onoclea 45 



sensibilis 45 



sensibilis f. hemiphyllodes 45 



sensibilis f. obtusilobata 45 



Struthiopteris 44 



Onagraceae 699 



Onopordum 1003 



Acanthium 1003 



Onosmodium 794 



hispidissimum 794 



molle 1083 



occidentale 1083 



virginianum 1083 



Ophioglossaceae 37 



Ophioglossum 37 



Engelmanni 38 



vulgatum 37 



vulgatum f. pseudopodum 37 



Opulaster intermedins 526 



opulifolius 526 



Opuntia 694 



humifusa 694 



Opuntia 694 



vulgaris 694 



Orach 425 



halberdleaved 426 



narrowleaf 425 



spear 426 



Orchard grass HI 



Orchid, cranefly 350 



fringeless purple 343 



grass-pink 347 



green fringe 343 



Hooker 342 



large roundleaf 342 



northern green 341 



prairie white fringe 343 



satyr 340 



small green wood 341 



small purple fringe 343 



tubercled 340 



white bog 341 



yellow fringe 34; 



Orchidaceae 33d 



Orchis 339 



showy 



spectabilis *39 



Omithogalum 31 a 



umbellatum 315 



PAGE 



Orobanchaceae 860 



( )robanche 860 



fasciculata var. typica 861 



ludoviciana var. genuina 861 



u ni Mm a var. typica 861 



Oryzeae 145 



Oryzopsis 137 



asperifolia 137 



pungens 137 



racemosa 137 



Osage-orange 395 



Osier, common 1039 



Osmorhiza 719 



Claytoni 719 



longistylis 719 



longistylis var. brachycoma 720 



longistylis var. villicaulis 720 



Osmunda 40 



cinnamomea 41 



cinnamomea f. auriculata 11 



cinnamomea f. incisa 42 



cinnamomea f. frondosa 42 



Claytoniana 41 



regalis 41 



regalis var. spectabilis 41 



Osmundaceae 40 



Ostrya 373 



virginiana 373 



virginiana f. glandulosa 374 



Otophylla auriculata 853 



Oxalidaceae 626 



Oxalis 626 



Acetosella 1069 



Brittoniae 628 



corniculata 629 



europaea 629 



europaea var. Bushii f. subglabrata 629 

 europaea var. Bushii f. vestita. . . . 629 



europaea f. cymosa 629 



europaea f. villicaulis 629 



filipes ,; - s 



florida 628 



grandis 627 



montana 1069 



repens u -~ 



stricta 628 



stricta var. piletocarpa 628 



stricta f. viridiflora 628 



violacea 627 



violacea var. trichophora 627 



Oxybaphus 433 



albidus IO 44 



hirsutus 1044 



linearis 1044 



nyctagineus 433 



Oxy coccus macrocarpos 744 



Oxycoccus 744 



