Lily family, 119 Linaria, 156 LIN´E-AR, very narrow with the margins parallel or nearly so. Lithospermum, 153 Low cudweed, 166 Lucerne, 140 Lotus, 139 Low hop-clover, 141 Madder family, 159 Mallow, 145, 146 Mallow family, 145 Malva, 146 Malvaceae, 145, 146 Mammoth clover, 141 Many-seeded goosefoot, 126 Maple-leaved goosefoot, 125 Marsh elder, 167 Marubium, 154 May-weed, 161 Medicago, 139, 140 Melilotus, 140 Mexican tea, 125 Milfoil, 160 Milkweed, 149 Milkweed family, 149 Millimeter, see last page of this bulletin Mint family, 154 m. m. Millimeter, see ruled lines on last page, 139 Mollugo, 128 Morning-glory family, 150 Mossy stonecrop, 138 Motherwort, 154 Moth mullein, 156 Mouse-ear chickweed, 129 Mouse-ear hawkweed, 167 Mullein, 156, 157 Musquash-root, 148 Mustard, 133, 134, 135 Mustard family, 132 Narrow-leaved dock, 122 Narrow-leaved hawk's beard, 165 Narrow-leaved plantain, 158 Nepeta, 154 Neslia, 137 Nettle family, 119 Nettle-leaved vervain, 153 Night-flowering catchfly, 130 Nightshade, 156 Night-shade family, 155 Nonesuch, 139 Nut-grass, 118 Oak-leaved goosefoot, 125 Oat, wild, 110 OB-LAN´CE-O-LATE, lanceolate in form, but tapering toward the base more than toward the apex. OB´LONG, longer than wide with nearly parallel sides. Compare Oval. OB-O´VATE, a flat body broader toward the apex than the base. See Ovate. OB-O´VOID, a solid body broader towards the apex than the base. See Ovoid. OB-TUSE´, having a rounded end or apex; blunt. Oenothera, 147 Old witch grass, 115 Onagraceae, 147 Orache, spreading, 124 Orpine family, 138 O´VAL, about twice as long as broad, with regular curved outlines, broadly elliptical. O´VATE, like a longitudinal section of an ordinary hen's egg, with the attachment, if any, at the broad end. O´VOID, the shape of a hen's egg and attached, if at all, at the large end. Ovoid spike rush, 118 Ox-eye daisy, 163 Oyster-plant, 170 Paint brush, 167 PA´LE-A, PA´LET, the upper bract which with the floral glume incloses the flower in grasses. Pale persicaria, 120 Panicum, 113 Panicum capillare, 115 Panicum, smooth, 115 Papaveraceae, 132 Parsley family, 148 Parsnip, wild, 149 Pastinaca, 149 Patience dock, 123 Pennsylvania persicaria, 120 Penny cress, 137 Peppergrass, 135, 136 Persicaria, dock-leaved, 120 Pigeon grass, 117 Pigweed, 124 Pigweed family, 124 Pink family, 128 Plantago, 158, 159 Plantain family, 158 Poa annua, 116 Poa compressa, 116 Poa, flat-stemmed, 116 Poa pratensis, 116 Poison hemlock, 148 Poison ivy, 145 Polygonaceae, 119 Polygonum, 119-120 Poppy family, 132 Porcupine grass, 117 Portulaca, 131 Portulacaceae, 131 Potentilla, 138, 139