. Botany for academies and colleges: consisting of plant development and structure from seaweed to clematis. Botany; 1889. 86 ACADEMIC 107) and Mint; here the leaves are also Decussate (L. decusso, I cut across), each pair standing at a right angle to the pair below it. Op- posite leaves are Whorled (Verti- cillate) when standing in threes, fours, etc., on the same circum- ferent line, as in the Woodruff (Pig. 110) and Oleander. Al- TBENATK leaves stand one above another at regular angles on dif- ferent circumferent lines, as in the Sweet Gale (Fig. Ill), the Cherry, etc. Alternate le
. Botany for academies and colleges: consisting of plant development and structure from seaweed to clematis. Botany; 1889. 86 ACADEMIC 107) and Mint; here the leaves are also Decussate (L. decusso, I cut across), each pair standing at a right angle to the pair below it. Op- posite leaves are Whorled (Verti- cillate) when standing in threes, fours, etc., on the same circum- ferent line, as in the Woodruff (Pig. 110) and Oleander. Al- TBENATK leaves stand one above another at regular angles on dif- ferent circumferent lines, as in the Sweet Gale (Fig. Ill), the Cherry, etc. Alternate leaves are Fascicti- late when bundled in twos, threes, etc., as in the Pines; Rosulate (rose-like) when separate but closely ar- ranged, as in the House-Leek and Ply- Trap (Fig. 112). 182. Spiral Arrangement.âAll leaves have an established order of arrangement, which is uniform in plants of the same species. In the strictly Alternate arrangement, like that of the Lime (in which the leaves stand above one another on opposite sides of the stem), if we fix a thread to the lowest node, or leaf-bud, and wind it around the stem from node to node, we shall form a spiral like the thread of a cork- screw. Taking the first round as the expression of the circumference or circle, 360°, the second node is half-way round, 180° from the first; the third is exactly above the first, completing the circuit. This is called the J cycle: 1, the numer- ator, names the number of cycles or circuits; 2, the denominator, names the number of nodes passed in completing it. This is also called Distichous^ or two- ranked (Gr. dis, twice, stikos, row). In the Sedges 3 nodes are passed ; this is the | cycle, or Tris- tichous. In the Cherry two cir- cuits are made and five nodes passed before the leaf (6th) stands over the first; this is the â J cycle, called Quincuncial (L. quinque, five). Much more in- tricate cycles are found in the Plantain, House-Leek, and Pine Cone. ria. 112.âFly-Xrap (Drosertt r
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