MONOTROPA. 10-1. (Erica.)

uni'flora, (bird's nest, Indian-pipe, w. J. 2.) stem 1-flowered; flower nodding at first, at length erect; scales of the stem approximate. Whole plant ivory white at first. 4-8 i.

MONOTROPSIS. 10-1. (Erica.)

odora'ta, (r-w. Mar.) flowers bell-form, in aggregate heads. 3-4 i. S. MORUS. 19-4. (Urtica.) [From mauros, black, so called from the colour of the fruit of one of its species.]

ni'gra, (black mulberry, Ju. h.) leaves heart-form, ovate, or sub-5-lobed; unequally toothed, scabrous. Ex.

alba, (white mulberry, M. h.) leaves heart-form, with oblique bases, ovate or lobed, unequally serrate, smoothish. From China and Persia. Naturalized. 15-20 f.

MUCOR. 21-6. (Fungi.)

aspergillus, (mould,) stipe filiform, dichotomous; little heads terminal, subconjugate, oblong when mature. On putrid fungi in autumn.

MYLOCARUUM. 10-1. (Erica.) [From mule, a mill, and karua, a kernel.]

ligustrinum, (buckwheat-tree, w. M. h.) leaves perennial, alternate, sessile, entire, glabrous; racemes simple, terminal. 6-15 f. S.

MYOSOTIS. 5-1. (Boragineæ.) [From mus, a mouse, otus, an ear, the leaves being hairy like a mouse's ear.]

arvensis, (forget-me-not, w-b. J. .) seeds smooth; calyx-leaves oval, acuminate, very hirsute, longer than the tube of the corolla; stem very branching; racemes conjugate; leaves lance-oblong, hirsute. 4-8 i.

palus'tris, (scorpion-grass, b. M. 2.) leaves lance-oval, rough; border of the corolla longer than the tube; flowers very small, bright blue. Wet grounds. na'na, (b. and y. 4.) leaves oblong, villose; racemes few-flowered; seeds smoothish. S.

MYOSUROS. 5-13. (Ranunculacea.) [From mus, mouse, and oura, tail.]

mini'mus, (Ap. .) leaves linear, entire; seed 1-flowered; stamens 5-8; petals anther-form. 2-4 i. S.

MYRICA. 20-4. (Amentacea.) [The name is derived from the Greek, its original meaning is uncertain.]

gale, (Dutch-myrtle, sweet-gale, M. h.) leaves wedge-lanceolate, serrate at the apex, obtuse-steril; aments imbricated; scales acuminate, ciliate; fruit in scaly heads, with a strong aromatic odour. 4-5 f. Bogs, mountains, and lakes.

cerife'ra, (bay-berry, wax-myrtle, g-p. M. h.) leaves acute; steril aments loose; scales acute; fruit globular, naked. On boiling, a pleasant-flavoured wax is obtained, which is used, either alone or with tallow, in making candles. 5-18 f.

MYRTUS. 11-1. (Labiata.) [From muros, perfume.]

commu'nis, (myrtle, w. Ju. h.) flowers solitary; involucrum 2-leaved ;

ovate. Ex.

NARCISSUS. 6-1. (Narcissi.)

leaves

pseudo-narcissus, (daffodil, M. 2) spatha_1-flowered; nectary bell-form, erect, crisped, equalling the ovate petals. Ex.

tazet"ta, (polyanthos, M. 4.) spatha many-flowered; nectary bell-form, plicate, truncate, thrice as short as the petals; petals alternately broader; leaves flat. Ex.

jonquilla, (jonquil, M. 4.) spatha many-flowered; nectary bell-form, short; leaves subulate.

Ex.

poeticus, (poet's narcissus, 4.) spatha 1-flowered; nectary wheel-form, very short, scarious, crenulate; leaves inflexed at the margin. Ex.

NARTHECIUM. 6-1. (Junca.) [From narthex, fennel.]

america'num, (y. Ju. 2.) racemes lax, sometimes interruptedly spiked; pedicels with a setaceous bract below the flower, and another embracing the base; filaments with very short hair; leaves narrow, ensiform flowers in a terminal spike or raceme; scape 1 f. Sandy swamps.

NELUMBIUM. 12-13. (Ranunculaceæ.)

lute'um, (water chinquepin, sacred bean, w-y. Ju. 2.) corolla many-petalled; anthers produced in a linear appendage of the extremity; leaves peltate, orbicular, very entire. Lakes. Flowers larger than those of any other plant in North America, except one species of magnolia.

NEMOMPHILA. 5—1. (Boragineæ.) [From nemos, a grove, and phileo, to love; so called from its habit.]

panicula'ta, (b. M. 3.) very hairy; radical leaves sub-pinnatifid; cauline ones angularly lobed; divisions of the calyx with minute, oval appendages; flowers on short peduncles, somewhat paniculate. Moist woods. phacelo'ides, (b. M. 7.) succulent; stem 3-sided; leaves alternate, pinnatifid; peduncles very long, 1-flowered, opposite the leaves, and terminal.

NEOTTIA. 18-1. (Orchidea.) [The name is from the Greek, and signifies bird's nest.] tortilis, (summer ladies'-tresses, w. Ju. 2.) radical leaves linear; scape sheathed; flowers spirally secund; lip somewhat 3-lobed; middle lobe larger, crenulate. 12 i.

gracilis, (ladies'-tresses, w. Ju.) radical leaves ovate; scape sheathing; flowers in a spiral row; lip obovate, curled; scape 8-12 inches, with a few sheathing leafets or scales; leaves on short petioles, sometimes falling off before the plant blossoms; flowers in a twisted spike. Var. secunda, spike scarcely twisted, flowers more slender. Dry woods.

cernua, (nodding ladies'-tresses, w. Au. 2.) leaves lanceolate, nerved; flowers in a dense spike, nodding; lip oblong, entire, acute.

NEPETA. 13-1. (Labiata.) [Name is said to have been derived from Nepet, a town in Tuscany.]

cata'ria, (catmint, catnep, b-w. 4.) hoary-pubescent; flowers in whorled spikes; leaves petioled, cordate, tooth-serrate.

NICOTIANA. 5-1. (Solanea.) [From Nicot, who first introduced it into Europe.] taba'cum, (Virginian tobacco, w-r. Ju..) leaves lance-ovate, sessile, decurrent; flowers acute. Naturalized at the north.

rustica, (common tobacco, g-y. Au. .) viscid-pubescent; stem terete; leaves petioled, ovate, very entire; tube of the corolla cylindrical, longer than the calyx; segments round, 12-18 i. Flowers in a terminal panicle or raceme. Introduced.

NIGELLA. 12-4. (Ranunculacea.) [From niger, black, on account of its black seed.] damasce'na, (fennel-flower, lady-in-the-green, b. M. .) flowers surrounded with a leafy involucrum, composed of linear bracts.

sati'va, (nutmeg-flower,) pistils 5; capsules muricate; roundish leaves subpilose, pinnatifid.

NOLINA. 6-3. (Junci.)

georgiana, (W. M. 4.) leaves long-linear, coriaceous, dry; scape with small subulate scales near the base; panicle racemose, spreading. 2-3 f.

NOSTOC. 21-4. (Algæ.)

commu'ne, on the earth; frond ventricose, gelatinous. On the earth after a storm; an inch or two in extent; olive green.

NUPHAR. 12-1. (Papaveracea.) [From the Greek, signifying water-lily.]

kalmia'na, (water-lily, Kalm's water-lily, Ju. 4.) leaves cordate, lobes near each other; calyx 5-leaved; stigma gashed, with 8-12 radiated lines leaves and flowers small.

lute'a, (yellow water-lily, y. Ju. 4.) calyx with 5 obtuse sepals; stigma entire, 16-20 rayed; leaves cordate-oval; petals much smaller than the sepals, truncate. Water.

advena, calyx with 6 sepals; petals numerous, small; petioles semi-cylindrical.

NUTTALLIA. 15-13. (Malvacea.) [In honour of Thomas Nuttall.]

digita'ta, (r. M. 4.) glaucous; lower leaves obsoletely digitate, sub-peltate; divisions linear; segments glabrous; upper leaves 3-parted and simple peduncles somewhat racemed, very long 3-4 f.

NYMPHEA. 12-1. (Papaveracea.) [From numpha, water-nymph.]

odora'ta, (pond-lily, w. Ju. 2.) leaves round-cordate, entire, sub-emarginate; lobes spreading asunder, acuminate, obtuse; petals equalling the 4-leaved calyx; stigma 16-20-rayed; flowers large, odorous. The Egyptian lotus belongs to this genus.

NYSSA. 20-5. (Æliagni.)

multiflo'ra, (sour or black gum, y-g. M. h.) leaves lanceolate, very entire, acute at each end; the petiole margined, and midrib villose; fertile peduncles many-flowered; flowers in umbellate clusters; drupe nearly round, dark blue. Low woods. 30-50 f.

biflo'ra, (tupelo-tree, swamp horn-bean,) leaves ovate-oblong, very entire, acute at each end, smooth; fertile peduncles 2-flowered; drupe oval, compressed. Swamps. 30-50 f.

OBOLARIA. 13-2. (Pediculares.)

virgin"ica, (penny-wort, r. Ap. 2.) stem simple; leaves oblong, truncate fleshy, purple beneath; flowers axillary, solitary, sessile. 3-4 i.

OCYMUM. 13-1. (Labiate.) [From okus, swift, on account of its rapid growth.] basilicum, (basil, .) leaves ovate, glabrous; calyx ciliate. 6-12 i. CENOTHERA. 8-1. (Onagræ.)

Capsules elongated, sessile.

biennis, (scabish, tree-primrose, y. J. ) stem villose, scabrous; leaves lance-ovate, flat-toothed; flowers sub-spiked, sessile; stamens shorter than the corolla. 3-5 f.

parviflo'ra, (y. Ju. 7.) stem smooth, sub-villose; leaves lance-ovate, flat; stamens longer than the corolla.

grandifloʻra, (y. Ju. ♂.) stem nearly smooth, branched; leaves ovate-lanceolate, glabrous; flowers axillary, sessile, large; petals obcordate; stamens declining, shorter than the corolla. 2-3 f. Introduced.

Capsules obovate, clavate, angular, mostly pedicelled. frutico'sa, (shrubby cenothera, sun-drop, y. Ju. 2.) pubescent; stem branching from the base, divaricate; leaves sessile, lanceolate, acute, slightly toothed, pilose; flowers in a terminal raceme; petals broad-obcordate. Shady woods. Stem 12-18 inches high, purple. Var. ambigua, has smaller flowers. hybri'da, stem erect, villose; leaves pubescent on both sides, lanceolate, remotely toothed, undulate; capsules some what spiked; flowers pale yellow. 9-18 i. chrysantha, (dwarf-scabish,) stem slender, minutely pubescent; leaves lanceolate, rather obtuse, flat, entire; segments of the calyx twice as long as the tube; capsule sessile; flowers small, bright yellow. Mountains.

OLEA. 2-1. (Jasmineæ.) [Name from the Celtic word olea, signifying oil.] america'na, (American olive, w. M. h.) leaves lanceolate-elliptic, entire; racemes compressed; bracts all persistent, connate, small. S.

europe'a, leaves lanceolate, entire; racemes axillary, crowded. The drupes when green are used for pickles, when ripe they afford the oil called olive

oil. Ex.

ONOCLEA. 21-1. (Filices.) [From onos, a vessel, and klieo, to close.]

sensibilis, (sensitive fern, J. 2.) barren frond pinnate; fertile one doubly pinnate; stem glabrous. The leafets slowly approach each other on pressing the stem in the hand.

ONOPORDON. 17-1. (Cinarocephala.)

acan"thium, (cotton thistle, p. Ju. ♂.) calyx scaly, scales spreading; leaves ovate-oblong, sinuate. Naturalized. Ex.

OPLOTHECA. 15-5. (Gerania.)

florida'na, (w. Ju.) stem erect, pubescent, with tumid joints; leaves sessile, lance-linear, scabrous above, lanuginous beneath. 3-4 f.

ORCHIS. 18-1. (Orchidea.) [A name derived from the Greek.]

spectabi'lis, (r. M. 4.) lip obovate, undivided, crenate, retuse; petals straight;

lateral ones longest; spur clavate, shorter than the germ; bracts longer than the flowers; stem leafless. 3-6 i.

tridentalla, (w. Ju. 2.) lip ovate-lanceolate, obtuse, 3-toothed; petals obtuse; spur filiform, longer than the germ. 6-12 i.

fla'va, (y. Ju. 2) lip 3-cleft, entire; middle division larger; spike compact; bracts longer than the flower. 1-2 f.

fimbria'ta, (p. Ju. 2) lip 3-parted, lobes all incisely fimbriate, and wedgeform; segments of the perianth oval, spreading, fimbriate toothed; spur filiform, clavate, longer than the germ; leaves broad-lanceolate; purple flowers, in a large spike. 2 f. Meadows.

psyco'des, (y. J. 4.) lip 3-parted, many-cleft; segments of the perianth obtuse; spur filiform, clavate, of the length of the germ; flowers in a large, terminal spike.

cilia'ris, (orange, y. J. h.) lip oblong-lanceolate, pinnately ciliate, twice as long as the germ. Stem 1-2 f. Leafy; smooth. Swamps.

dilita'ta, (giant orchis, w-y. J. h.) spur shorter than the germ; lip entire, linear, with the base dilated, of the length of the spur; stem leafy. In woods the flowers are green, in meadows, white. 1-4 f.

bractea'ta, (vegetable satyr, g-w. M. h.) lip linear, emarginate, obsoletely 3toothed; spur short, sub-inflated, somewhat 2-lobed; bracts twice as long as the flowers, leaf-like, spreading; root palmate. 6-10 i.

ORIGANUM. 13-1. (Labiata.) [From oros, a mountain, and gano, to rejoice, so called because it grows upon the mountain sides.]

vulga're, (wild marjoram, r. Ju. 4) spikes round, panicled, heaped; bracts ovate, longer than the calyx. 1-2 f

majora'na, (sweet marjoram, h.) spikes roundish, ternate, compact, peduncled; leaves petioled, oval, obtuse, smoothish. 6-12 i. Ex.

ORNITHOGALUM. 6-1. (Asphodeli.) [From ornis, a bird, and gala, milk, from the colour of its flowers.]

umbella'tum, (star of Bethlehem, M. 4.) flowers corymbed, peduncles longer than the bracts; filaments subulate. Naturalized. 6-8 i.

bracteatum, (p. 4.) scape bracted, 1-flowered, terete; petals lance-oblong, obtusish; filaments linear; leaves channelled, filiform. 4 i. S.

ORNUS. 2-1. (Jasmineæ.) [From the Hebrew, orn, an ash.]

america'na, (M. h.) leafets broad-ovate, serrate, terminal one obcordate. Shady woods. Resembles the genus Fraxinus.

euro'pea, affords the manna of commerce. by some to be but a variety of this. Ex.

The American Ornus is thought

OROBANCHE. 13-2. (Pediculares.) [From orobos, the wild pea, and agcho, to suffocate, so called because it twines around the Orobos and destroys it.]

uniflo'ra, (cancer-root, b-w. M. 4.) stem very short; peduncles 2, elongated, scape-form, 1-flowered, naked; scales smooth, concave; lobes of the corolla oblong-oval, with a pubescent, coloured margin. 4-6 f. Parasitic. Woods. america'na, (Ju. 2.) stem simple, covered with ovate-lanceolate, imbricate scales; spike terminal, smooth; corolla recurved; stamens exserted; flowers brownish yellow, the spike covered by the scales of the stem. 6-8 i. Parasitic. Woods.

OROBUS. 16-10. (Leguminosa.) [From erepto, to eat, the root being considered nutritious.] dis''par, (ervum, w-y. J. 4.) leaves unequally pinnate; leafets linear, obtuse; stipules ovate, acute; racemes sessile.

tubero'sus, (the heath-pea.) The Scotch islanders chew the root; they hold the plant in high esteem. Ex.

ORONTIUM. 6-1. (Aroidea.) [From Orontes.]

aquaticum, (golden club, y. M. 4.) leaves all radical, lance-ovate; scape cylindrical, spiked; flowers with a peculiar smell. Water. 1-2 f.

ORTHOCARPUS. 13-2. (Pediculares.) [From orthos, erect, and carpos, fruit.] lute'us, (y. Ju.) stem simple, terete, hirsute; leaves alternate, sessile, acute, entire; calyx-bracts and leaves viscid-pubescent. 12-14 i. S.

ORYZA. 6-2. (Graminea.) [From orez, Arabian.]

sati'va, (rice,.) culm jointed; leaves clasping; panicle terminal. Ex.

OSMUNDA. 21-1. (Filices.) [From Osmund, who first used it as a medicine.] cinnamo'mea, (flowering-fern, y. J. 2.) barren frond doubly pinnatifid; segments oval, entire; fertile fronds with opposite racemes, woolly. 3-6 f. OSTRYA. 19-12. (Amentacea.) [From oseon, a bone, on account of its hardness.] virgin'ica, (iron-wood, hop-hornbeam, g. M. ħ.) leaves alternate, ovate-oblong, sub-cordate, acuminate, unequally serrate; strobilums oblong-ovate. A small tree with very hard and heavy wood. Fertile flowers enlarged into a sort of oblong cone, resembling the common hop. Woods. Can. to Car.

OXALIS. 10-5. (Gerania.) [From oxus, sour, on account of the juice.]

acetosella, (wood-sorrel, w. r. M. 2.) stemless; scape 1-flowered, longer than the leaves; leaves ternate, broad-obcordate, with rounded lobes; styles as long as the inner stamens; root dentate.

violacea, (violet wood-sorrel, p. J. 4.) stemless; scape umbelliferous, 3-9flowered; flowers nodding; leaves ternate, obcordate, smooth; styles shorter than the outer stamens. Scape 4-6 i. Rocky woods.

stric'ta, (upright wood-sorrel, y. J..) hairy; stem erect, sometimes procumbent, branched; umbels about as long as the leaves; leaves ternate, obcordate; petals obovate, entire; styles as long as the inner stamens. 4-10 1. Sandy fields. Flowers small, 4-6 in an umbel.

OXYCOCCUS. 8-1. (Ericea.) [From orus, sour, and coccus, a berry.]

macrocarpus, (cranberry, r. J. h.) creeping; stem ascending; leaves oblong, flattish, obtuse, becoming white beneath; pedicels elongated; divisions of the corolla lance-linear; berry large, bright scarlet. Wet grounds. palustris, (J. h.) divisions of the corolla ovate; berries purple, smaller than the preceding. Alpine bogs.

OXYTROPIS. 16-10. (Leguminosa.)

lombes'tii, (p. Ju. 4.) stemless, silky-pilose; leafets numerous, oblong, acute at each end; scape about equal to the leaves; spikes oblong, capitate; bracts lance-linear, about equal to the calyx.

PEONIA. 12-3. (Papaveracea.) [From Paon, who is said to have first applied it to medicinal purposes.]

officinalis, (peony, r. J. 2.) leaves decompound; leafets lobed, lobes broadlanceolate; capsules downy. Ex.

PANAX. 5-2. (Araliæ.) [From pan, all, and akos, medicine, on account of its great virtues.] quinquefo'lia, (ginseng, w. M. 4.) root fusiform; leaves ternate, or quinate; leafets oval, acuminate, petioled-serrate. 1-2 f.

trifolium, (dwarf ginseng.) root tuberous, roundish; stem simple, smooth; leaves ternate; leafets sub-sessile, lance-oblong, serrate; styles often 3; berry 3-seeded. Woods. 4-6 i.

PANCRATIUM. 6-1. (Narcissi.) [From pan, all, and krateo, to conquer, supposed by the ancients to have been a powerful medicine.]

mexicanum, (w. M. 4.) spatha about 2-flowered; leaves lance-oblong; 6 teeth of the nectary bearing stamens, 6 simple. 18-24 i. S.

PANICUM. 3-2. (Gramineæ.)

crus-galli, (barn-grass, Au. .) racemes alternate and in pairs; compound rachis 5-angled; glumes terminating in hispid bristles; sheath glabrous

2-4 f.

PAPAVER. 12-1. (Papaveraceae.) [From pappa, pap, so called because nurses mixed this plant in children's food to make them sleep.]

somnif"erum, (opium poppy, J. .) calyx and capsule glabrous; leaves clasping, gashed, glaucous. Ex.

rhe as, (red corn-poppy, r. J.) capsules glabrous, sub-globose; stems manyflowered, pilose; leaves gash-pinnatifid. Ex.

nudicau'le, (y. .) capsule hispid; scape 1-flowered, naked, hispid; leaves sub-pinnate; leafets lanceolate, lower ones somewhat gashed.

PARMELLA. 21-5. (Alga) [From parme, shield, and eilo, to enclose.]

capera'ta, (shield lichen,) frond orbicular, pale yellow, becoming green, rugose, at length granulated, dark and hispid beneath; lobes plicate, sinuate