122 OSMUNDA-PARMELLA. 



OSMUNDA. 21—1. (Filices.) [From Osmund, who first used it as a medicine.] 

 cinnamo'mea, (flowering-fern, y. J. %.) barren frond doubly pinnatifid ; sag- 

 ments oval, entire; fertile fronds with opposite racemes, woolly. 3-6 L 

 OSTRYA. 19—12. (Amentacecc.) [From oseon, a bone, on account of its hardness. j 

 virgin"ica, (iron-wood, hop-hornbeam, g-. M. Yi-) leaves alternate, ovate-ob- 

 iong, 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, (Oerania.) [From oims, sour, on account of tlie juice.] 



acetoscV'la, (wood-sorrel, w. r. M. %..) stemless ; scape 1-flowered, longer 

 than the leaves; leaves ternate, broad-obcordate, with rounded lobes; styles 

 as long as the inner stamens ; root dentate. 



viola'cea, (violet wood-sorrel, p. J. %.) stemless ; scape umbelliferous, 3-9- 

 flowered; 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 procum- 

 bent, branched ; umbels about as long as the leaves ; leaves ternate, obcor- 

 date ; petals obovate, entire ; styles as long as the inner stamens. 4-10 i. 

 Sandy fields. Flowers small, 4-6 in an umbel. 

 OXYCOCCUS. 8—1. iErice<z.) [From oxus, sour, and coccus, a berry.] 



macrocar"jms, (cranberry, r. J. Tj.) creeping; stem ascending; leaves oblong, 

 flattish, obtuse, becoming white beneath ; pedicels elongated; divisions ot 

 the corolla lance-linear ; berry large, bright scarlet. Wet grounds. 



palus"triz, (J. 1^.) divisions of the corolla ovate; berries purple, smaller than 

 the preceding. Alpine bogs. 

 OXYTROPIS. 16—10. (Leguminoscb.) 



lombes"tii, (p. Ju. %.) 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. 



P.S;ONIA. 12—3. (Papaveracea.) [From Pmon, who is said to have first applied it to medi- 

 cinal purposes.] 



officina'lis, (peony, r. J. 1\..) leaves decompound ; leafets lobed, lobes broad- 

 lanceolate ; capsules downy. Ex. 

 PANAX. 5—2, (Arali(B.) [From pan, all, and akos, medicine, on account of its great virtues.] 



quinquefo'lia. (ginseng, w. M. TJ..) root fusiform; leaves ternate, or quinate ; 

 leafets oval, acuminate, petioled-serrate. 1-2 f. 



trifo'liuvi, (dwarf ginseng,) root tuberous, roundish; stem simple, smooth; 

 leaves ternate ; leafets sub-sessile, lance-oblong, serrate; styles often 3; ber- 

 ry 3-seeded. Woods. 4-6 i. 



PANCRATIUM. 6—1. (Narcissi.) [From joan, all, and Ara^eo, to conquer, supposed by the 

 ancients to have been a powerful medicine.] 

 Tuexica'nuvi, (w. M. '2J..) spatha about 2-flowered; leaves lance-oblong; 6 

 teeth of the nectary bearing stamens, 6 simple. 18-24 i. S. 



PANICUM. 3—2. (Graminem.') 

 crus-gaV'li, (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. (Papaveracea.) [From pa^jpa, pap, so called because nurses mixed thio 

 plant in children's food to malte them sleep.] 

 somnif'erum, (opium poppy, J. ©.) calyx and capsule glabrous; leaves clasp- 

 ing, gashed, glaucous. Ex- 

 rhe'as, (red corn-poppy, r. J. ©.) capsules glabrous, sub-globose ; stems many- 

 flowered, pilose ; leaves gash-pinnatifid. Ex. 

 nudicau'le, (y. g'.) capsule hispid; scape 1-flowered, naked, hispid; leaves 

 sub-pinnate ; leafets lanceolate, lower ones somewhat gashed. 



PARMELLA. 21—5. {Alga.) [From porme, shield, and ez7o, to enclose.] 



capera'ta, (shield lichen,) frond orbicular, pale yellow, becoming green, ru- 

 gose, at length granulated, dark and hispid beneath ; \obes plicate, sinuate- 



