120 NYMPH^A-ORCHIS. 



NYMPH^A. 12—1. (Papaveracece.) [Frftm numpha, water-nymph.] 

 odora'ta, (pond-lily, w. Ju. %.^ leaves round-cordate, entire, sub-emarginaie : 

 lobes spreading asunder, acunainate, obtuse; petals equalling the 4-leave(J 

 calyx ; stigma 16-20-rayed ; flowers large, odorous. The Egyptian lotus 

 belongs to this genus. 



NYSSA. 20-5. {Mliagni.). 



muUiJlo'ra, (sour or black gum, y-g. M. T^.) leaves lanceolate, very enure, 

 acute at each end ; the petiole margined, and midrib villose ; fertile pe- 

 duncles many-flowered; flowers iu umbellate clusters; drupe nearly round, 

 dark blue. Low woods. 30-50 f. 



bijio'ra, (tupelo-tree, swamp horn-bean,) leaves ovate-oblong, very entire, 

 acute at each end, smooth ; fertile peduncles 2-flowered ; drupe oval, com- 

 pressed. Swamps. 30-50 f. 



OBOLARIA. 13—2. {Pedicular es.) 

 virgin'Hca, (penny-wort, r. Ap. %.) stem simple ; leaves oblong, truncate 

 fleshy, purple beneath ; flowers axillary, solitary, sessile. 3-4 i. 



OCYMUM. 13—1. (Labial(B.) [From okus, swift, on account of its rapid growtli.] 

 basWicura, (basil, ©.) leaves ovate, glabrous; calyx ciliate. 6-12 i.- 

 CENOTHERA. 8—1. (.Onagrce.) 



Capsules elongated, sessile. 

 bien"nis, (scabish, tree-primrose, y. J. J^.) stem villose, scabrous; leaves 

 lance-ovate, flat-toothed ; flowers sub-spiked, sessile ; stamens shorter thaa 

 the corolla. 3-5 f. 

 parvijlo'ra, (y. Ju. rf.) stem smooth, sub-villose ; leaves lance-ovate, flat ; sta- 



mens longer than the corolla. 

 grandijln'ra, (y. Ju. cf.) stem nearly smooth, branched; leaves ovate-lanceo- 

 late, glabrous; flowers axillary, sessile, large; petals obcordate ; stamens 

 declining, shorter than the corolla. 2-3 f. Introduced. 



Capsules obovate, clavate, angular, mosthj pedicelled. 



frutico'sa, (shrubby Oenothera, sun-drop, y. Ju. 91) 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. amhigvM, has smaller flowers. 



hybri'da, stem erect, villose; leaves pubescent on both sides, lanceolate, re- 

 motely toothed, undulate ; capsules somewhat spiked; flowers pale yellow. 

 9-18 i. 



chrysa/i"t/ia, (dwarf-scabish,) stem slender, minutely pubescent ; leaves lan- 

 ceolate, rather obtuse, flat, entire ; segments of the calyx twice as long as 

 the tube ; capsule sessile ; flowers small, bright yellow. Mountains. 



OI>EA. 2—1. {Jaaminem.) [Name from tlie Celtic word oha, signifying oil.] 

 america'na, (American olive, w. M. T7.) leaves lanceolate-elliptic, entire; ra- 

 cemes 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 aflbrd the oil called olive 

 oil. Ex. 

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

 scnsi'bilis, (sensitive fern, J. Tj..) barren frond pinnate ; fertile one doubly pin- 

 nate ; stem glabrous. The leafets slowly approach each other on pressing 

 the stem in the hand. 

 ONOPORUON. 17—1. iCinarocephal(B.) 

 acan"ihium, (cotton thistle, p. Ju. (^.) calyx scaly, scales spreadmg; leaves 

 ovate-oblong, sinuate. Naturalized. Ex. 

 OPLOTHECA. 15—5. {Gerania.-) 

 Jlorida'na, (w. Ju.) stem erect, pubescent, with tumid joints; leaves sessile, 

 lance-linear, scabrous above, lanuginous beneath. 3-4 f. 

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

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



