96 



Index 



Red Oak 21 



Red Plum 35 



Red Root 48 



Red Wild Columbine 29 



Retama 36 



Rhamnus caroliniana Walt 49 



Rhombolytrum albescens Nash 14 



Rhus canadensis var. trilobata Gray. . 47 

 Rhus copallina var. lanceolata A. 



Gray 47 



Rhus radicans L 47 



Rhus Toxicodendron L 47 



Rhus virens Lindh 47 



Rhynchosia texana Torr and Gray. . 37 



Ricinus communis L 46 



Rivina humilis L 26 



Rock-brush 37 



Rock Moss 34 



Rock-rose 52 



Roripa abtusa Brit 33 



Roripa Nasturtium Rusby 33 



Rosinweed 83 



Rough Pigweed 26 



Rubus trivialis Michx 34 



Rudbeckia amplexicaulis Cass 81 



Rudbeckia bicolor Nutt 82 



Ruellia Drummondiana A. Gray 72 



Ruellia tuberosa L 72 



Rulac texana Small 48 



Rumex altissimus Wood 24 



Rumex Berlandieri Meisn (?) 24 



Rumex crispus L 24 



Rush 17 



Sabina sabinoides Small (Juniperus 



sabinoides Sargent 7 



Sabina virginiana Antoine ( Juniperus 



virginiana L 7 



Sagina decumbens T. and G 28 



Sagittaria platyphyUa J. G. Smith . . 8 



Sabbatia campestris Nutt 60 



Salix nigra Marsh 21 



Salvia coccinea L 69 



Salvia farinacea Benth 69 



Salvia Roemeriana Scheele 69 



Salviastrum texanum Scheele 69 



Sambucus canadensis L 74 



Samolus cuneatus Small 58 



Samolus floribundus H.B.K 58 



Band Bur 9 



Sand Parsley 56 



Sanvitalia ocymoides DC 82 



Sandwort 28 



Sanicula canadensis L 57 



Sanicula gregaria Bicknell 57 



Sapindus Drummondii 48 



Schizachyrium scoparium Nash (An- 



dropogon scoparius Michx 9 



Schmaltzia lanceolata Small 47 



Schmaltzia trilobata Small 47 



Schmaltzia virens Small 47 



Schoenocaulon Drummondii A. Gray.. 17 



Schrankia uncinata Willd 35 



Scirpus validus Vani 15 



Sclerocarpus uniserialis B. and H. . . 82 



Scutellaria Drummondii Benth 69 



Scutellaria resinosa Torr 69 



Sedum Nuttalianum Ref 84 



Sedum pulchellum Michx 34 



Sieglingia mutica Kuntze 14 



Selaginella apus Spring 7 



Selaginella arenicola Underw 7 



Senecio ampullaceus Hook 85 



Senecio lobatus Pers 85 



Senecio obovatus Muhl 86 



Senna 36 



Sensitive Briar 35 



Serinea oppositifolia Kuntze 87 



Sesban macrocarpa Muhl 40 



Sesbania 40 



Sesbania Cavanillesii Wats 37 



Setaria glauca L 10 



Setaria verticillata Beauv 10 



Shepherd's Purse 31 



Shield Fern 5 



Shin Oak 21 



Shittimwood 58 



Shooting Star 58 



Sicyos angulata L 76 



Sida diffusa H.B.K 51 



Sida fdipes A. Gray 51 



Sida filiformis Moris 51 



Sida hastata St. Hil 51 



S. physocalyx A. Gray 51 



Sida spinosa L 51 



Sieglingia albescens Kuntze 14 



Silene antirrhina L 29 



Silphium albiflorum Gray 83 



SUphium asperrimum Hook 83 



Siphonoglossa pilosella Torr 72 



S. brachycarpa Richards 33 



Sisymbrium canescens var. brachy- 

 carpa Watt 33 



Sisyrinchium minus Engelm. & Gray 20 



Sisyrinchium pruinosum Bicknell... 20 



Sitilias grandiflora Greene 87 



Stilias multicalis Green 87 



Skullcap 69 



Skunk Bush 42 



Skunk Bush 47 



Sleepy Catchfly 29 



Slender Bladder-pod 32 



Small-leaved Mulberry 23 



Smart Weed 24 



Smilax Bona-nox L 19 



Snakeroot 57 



Snapdragon 70 



Sneezeweed 84 



Snow-on-the-mountain 45 



Soapberry 48 



Solanum carolinense L 65 



Solanum eleagnifolium Cav 65 



Solanum heterodoxum Dunal 65 



Solanum nigrum L 65 



Solanum rostratum Dunal 65 



Solanum Torreyi A. Gray 65 



Solanum triquetrum Cav 65 



Solidago canadensis L 80 



Solidago nemoralis Ait 80 



Sonchus asper All 87 



Sonchus oleraceus L 87 



Sophia millefolia Rybd 33 



Sophora affinis T. and G 40 



Sophora secunidflora DC 40 



Sorghastrum nutans Nash 9 



Sorghum halepense Pers 9 



Sour Grass 42 



Sour Grass 41 



Sow Thistle 87 



Spanish Bayonet 19 



Spanish Buckeye 48 



Spanish Moss 17 



Spearmint 68 



Specularia biflora Gray 76 



Specularia coloradoensis Buckl 76 



Specularia leptocarpa Gray 76 



Specularia perfoliata A. DC 76 



Speedwell 71 



Spermolepis echinatus Heller 57 



Spice Bush 53 



