116

Salsify, 170

Salsola, 126

Sand-bur, 112

Sand plantain, 158

Sand rocket, 135

Sandwort, 129

Saponaria, 129

Scarlet clover, 141

Scleria, 128

Scrophulaceae, 156

Secale, 116

Sedge family, 118

Sedum, 138

Self-heal, 155

Setaria glauca, viridis, 117

Sheep sorrel, 122

Shepherd's purse, 134

Sherardia, 159

Shore knot-weed, 120

Sida, 146

Silene, 129, 130

Silvery cinquefoil, 138

Sisymbrium, 137

Sleepy catchfly, 129

Slender pigweed, 127

Slender nettle, 119

Slender rush, 118

Small alyssum, 132

Smaller burdock, 162

Small-flowered crane's bill, 142

Small-flowered crowfoot, 131

Small-fruited false flax, 134

Smut-weed, 120

Solanaceae, 155

Solanum, 155, 156

Sonchus, 169

Sorrel, 121

Sour dock, 121

Sow-thistle, 169

Spanish dodder, 151

Spear grass, 116

Speedwell, 157

Spergula, 130

SPIKE'LET, a small or secondary spike, as found in grasses.

Spotted spurge, 144

Spring clotbur, 171

Spring sow-thistle, 169

Spurge family, 143

Spurry, 130

Squirrel-tail grass, 115

St. John's-wort family, 147

Star thistle, 163

Stellaria, 131

STER'ILE, not fertile.

Stick-seed, 152

Stink grass, 115

Stipa spartea, 117

Stonecrop, mossy, 138

Stork's-bill, 142

STRI'ATE, striped with parallel ridges and grooves.

Swallow-wort, 149

Swamp begger-ticks, 163

Sweet clover, 140

Sweet everlasting, 166

Syntherisma, 113

Tall buttercup, 131

Tall mustard, 137

Taraxacum, 170

Teasel family, 160

Thistle, 164

Thistle, Russian, 126

Thorn apple, 155

Three-seeded mercury, 143

Thyme-leaved sandwort, 129

Thyme-leaved speedwell, 157

Thyme-leaved spurge, 144

Toad-flax, 156

Tragopogon, 170

Treacle mustard, 135

Trefoil, 139

Trifolium, 141, 142

TRUN'CATE, terminating abruptly, as though cut off or flattened
at the end. Compare Premorse and Succise.

TU'BER-CLE, a swollen part or a root due to bacteria. Usually
applies to such as possess the power to fix nitrogen; a little
tuber.

Tumbleweed, 127

Tumbling mustard, 137

Umbelliferae, 148

Upright spotted spurge, 144

Urtica, 119

Velvet leaf, 145

Velvet-leaved mullein, 157

Verbascum, 156, 157

Verbena, 153