. The elements of materia medica and therapeutics (Volume 2) . THE GRASS TRIBE. 59 2. , De Cand.—ENDOGENS. MONOCOTYLEDONES, JuS8. Fig. Endogens, or Monocotyledons. q. Transverse section of an endogenous stem, show-ing the absence of medullary rays and of annuallayers. u. Stem and leaves of an endogen, showing thealternated sheathing leaves, with parallelveins. r. Germinating seed of Tradescantia erislata, show- ing the plumule rupturing the coleoptilum, withthe radicle and railicels. s. Sections of a germinating seed, showing the coty-ledon remaining in the testa. t. Germinatin
. The elements of materia medica and therapeutics (Volume 2) . THE GRASS TRIBE. 59 2. , De Cand.—ENDOGENS. MONOCOTYLEDONES, JuS8. Fig. Endogens, or Monocotyledons. q. Transverse section of an endogenous stem, show-ing the absence of medullary rays and of annuallayers. u. Stem and leaves of an endogen, showing thealternated sheathing leaves, with parallelveins. r. Germinating seed of Tradescantia erislata, show- ing the plumule rupturing the coleoptilum, withthe radicle and railicels. s. Sections of a germinating seed, showing the coty-ledon remaining in the testa. t. Germinating embryo of a grass, to show the twoalternate cotyledons of unequal size, with theintermediate plumule. Essential Character.— Trunk usually cylindrical, when a terminal bud only is developed,becoming conical and branched when several develope : consisting of cellular tissue, amongwhich the vascular tissue is mixed in bundles, without any distinction of bark, wood, andpith, and destitute of medullary rays; increasing in diameter by the addition of new matterto the centre. Leaves frequently sheathing at the base, and not readily separating from
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Keywords: ., bookcentury1800, bookdecade1840, bookid, booksubjectmateriamedica
