ORIGANUM-ORYZA. Igi 



lateral ones longest ; spur clavate, shorter than the germ ; bractb longer 

 than the flowers; stem leafless. 3-6 i. 



tridenta'ta, (w. Ju. %.) lip ovate-lanceolate, obtuse, 3-tootlied ; petals obtuse, 

 spur filiform, longer than the germ. 6-12 i. 



fia'va, (y. Ju. %.) lip 3-cleft, entire ; middle division larger ; spike compact ; 

 bracts longer than the flower. 1-2 f. 



fimbria' ta, (p. Ju. %.) lip 3-parted, lobes all incisely fimbriate, and wedge- 

 form; 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,(j.3.%.) lip 3-parted, many-cleft; segments of the perianth ob- 

 tuse; spur filiform, clavate, of the length of the germ; flowers in a large, 

 terminal spike. 



cilia'ris, (orange, y. J. T^.) 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. T^) spur shorter than the germ ; lip entire, lin- 

 ear, with the base dilated, of the length of the spur ; stem leafy. In woods 

 the flowers are green, in meadows, while. 1-4 f 



bractea'ta, (vegetable satyr, g-vj. M. b.) lip linear, emarginate, obsoletely 3- 

 toothed ; 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. (LabiatcB.) [From oros, a mountain, and g-ana, to rejoice, so called be- 

 cause it grows upon tlie mountain sides.] 

 vulga're, (wild marjoram, r. Ju. %.) spikes round, panicled, heaped; bracts 



ovate, longer than the calyx. 1-2 f 

 majora'na, (sweet marjoram, Tj.) spikes roundish, ternate, compact, pedun- 

 cled ; leaves petioled, oval, obtuse, smoothish. 6-12 i. Ex. 



OKNITHOGALUM. 6—1. {Asphoddi.) [From arms, a bird, and g-a/a, milli, from the colour 

 of its flowers.] 



umbella'lum, (star of Bethlehem, M. 'Zj..) flowers corymbed, peduncles longer 



than the bracts; filaments subulate. Naturalized. 6-8 i. 

 broxtea'tum, (p. %.) scape bracted, 1-flowered, terete ; petals lance-oblong, ob- 



tusish ; filaments linear ; leaves channelled, filiform. 4 i. S. 

 ORNUS. 2—1. (JasminecB.) [From the Hebrew, orn, an ash.] 

 america'na, (M. T^-) leafets broad-ovate, serrate, terminal one obcordate. 



Shady woods. Resembles the genus Fraxinus. 

 euro'pca, affords the manna of commerce. The American Ornus is thought 



by some to be but a variety of this. Ex. 



OROBANCHE. 13—2. (Pediculares.) [From oroios, the wild pea, and ag-cAo, to suffocate, 

 so called because it twines around the Orobos and destroys it.] 

 unifio'ra, (cancer-root, b-w. M. %.) 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. %..') stem simple, covered with ovate-lanceolate, imbricate 

 scales ; spike terminal, smooth ; corolla recurved ; stamens exserted ; flow- 

 ers brownish yellow, the spike covered by the scales of the stem. 6-8 i. 

 Parasitic. Woods. 



OROBUS. 16 — 10. (Leffuminosm.) [From erep/o, to eat, the root being considered nutritious.] 

 dis"par, (ervum, w-y. J. %.) 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. {Aroidem.) [From Orontes.] 

 aqvM"icum, (golden club, y. M. %..) 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-Zw.) stem simple, terete, hirsute; leaves alternate, sessile, acute, 

 entire ; calyx-bracts and leaves viscid-pubescent. 12-14 i. /S. 



ORYZA. 6—2. (GraminecB.) [From orez, Arabian.] 

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



