trianthemoides, 876 



verrucosum, 879 

 Setaria, 332 



geniculata, 332 



glauca, 334 



lutescens, 334 



magna, 334 



verticillata, 334 

 Seutera palustris, 1349 

 Seymouria macrophylla, 



1495 

 Shade betony, 1431 

 Shade mud-flower, 1487 

 Shadow-witch, 723 

 Shagbark hickory, 775 

 Sheep sorrel, 798 

 Shellbark, 775 

 Shepherd's purse, 985 

 Shinnersia rivularis, 1599 

 Shooting-star, 1281 

 Short-awn foxtail, 236 

 Short-beaked sedge, 499 

 Showy-milkweed, 1340 

 Shrubby 



-alkali aster, 1621 



-cinquefoil, 1025 



-St. John's-wort, 1133 

 Shumac, 1093 

 Sibara, 965 



virginica. 965 

 Sicklegrass. 218 

 Sicyos, 1571 



angulatus, 1571 

 Sida, 1124 



alba, 1125 



hederacea, 1124 



leprosa 



hederacea, 1124 



rhombifolia, 1125 

 Sidalcea, 1114 



Candida, 1117 



neomexicana, 1114, 1117 

 Sieversia turbinata, 1035 

 Silene, 887 



acaulis 



subacaulescens, 887 

 Silkweed, 1339 

 Silver 



-bells, 1299 



Carolina-, 1299 



-plumegrass, 336 



-saltbush, 851 

 Silverhead, 868 

 Silverweed, 1031 

 Silvery desert willow, 761 

 Sisymbrium. 965 



altissimum, 965 

 Sisyrinchium, 673 



angustifolium, 675 



atlanticum, 675 



bermudianum, 675 



biforme, 676 



Brownii, 675 



cernuum, 674 



demissum, 676 



dimorphum, 676 



exile, 675 



gramineum, 675 



graminioides, 675 



laxum, 675 



longipedunculatum, 676 



longipes, 674 



micranthum, 675 



minus, 675 



montanum, 675 



rosulatum, 675 



sagittiferum, 675 



texanum, 675 



Thurowii, 675 

 Sium, 1234 



cicutaefolium, 1237 



suave, 1234 

 Skullcap, 1412 



mad-dog-, 1416 



marsh-, 1415 



rough-, 1412 

 Skunk-cabbage, 655 

 Slender 



-bog-orchid, 709 



-button weed, 1552 



-clubmoss, 41 



-hair grass, 222 



-rush, 618 



-water-nymph, 126 

 Slough grass, American-, 



259 

 Small butterwort, 5, 1522 

 Small wood orchid, 5, 710 

 Smartweed, 4, 897, 820 



-dodder, 1362 



perennial-, 826 



pink-, 823 



water-, 820, 826 



willow-, 823 

 Smilacaceae, 663 

 Smilacina, 657 



stellata, 657 

 Smilax, 663 



laurifolia, 663 



rotundifolia, 663 

 quadrangularis, 664 



Walteri, 664 

 Smooth 



-alder, 782 



-barked cottonwood, 739 



-buttonweed, 1552 



-cordgrass, 262 



-scouring-rush, 46 



-yellow violet, 1 152 

 Smother-weed, 843 



Smutgrass, 252 

 Snakeroot 



black-, 653 



button-, 1254, 1595 

 Snakeweed. 817, 1608 

 Sneezeweed, 1677, 1679 



orange. 1678 

 Snow-berry, 1560 

 Snowdrop-tree, 1299 

 Snowy orchid, 5, 700 

 Soapwort gentian, 1326 

 Soft rush, 612 

 Soft-stem bulrush, 363 

 Solanaceae, 1449 

 Solanum. 1449, 1450 



Douglasii, 145ft 



Melongena, 1449 



nigrum, 1450 



nodifloruT,,, 1450 



tuberosum, 1449 

 Solidago, 1362, 1365, 1367, 

 1368, 1609, 1610, 

 1611 



altissima, 1613 

 canescens, 1613 

 pluricephala, 1613 



angustifolia, 1612 



arizonica, 1613 



aspera, 1612 



caesia, 1612 



decumbens, 1615 



gigantea, 1613 

 leiophylla, 1613 



occidentalis, 1615 



rugosa, 1613 

 aspera, 1613 

 celtidifolia, 1612 



salicina, 1612 



sempervirens 

 mexicana, 1612 

 sempervirens, 1612 



spathulata 

 nana, 1615 



striata, 1612 



ulmifolia, 1612 

 Solomon's seal, false, 657 

 Sombrerillo, 1219 

 Sophronanthe pilosa, 1467 

 Sorghum, 338 



halepense, 338 

 Sorrel 



heart-, 800 



mountain-, 796 



sheep-, 798 

 Sour 



-bush. 1395 



-clover, 1047 



-dock, 802 



-gum, 1262 



1771 



