. Class-book of botany [microform] : being outlines of the structures, physiology, and classification of plants : with a flora of the United States and Canada. Botany; Botany; Plants; Plants; Botanique; Botanique; Plantes; Botanique. PHYLLOTAXV, OR LUAF ARRANGEMENT. 49 lie 231. The alder cycle. In the alder, birch, sedges, &c., the cycle is not com- plete until the fovrth leaf is reached. The fourth leaf stands over the tirst, the tifth over the second, &c., forming tliree vertical rows. Here call the cycle 4-; 1 denotes the turns, 3 the leaves, and this fraction itself the angular dis
. Class-book of botany [microform] : being outlines of the structures, physiology, and classification of plants : with a flora of the United States and Canada. Botany; Botany; Plants; Plants; Botanique; Botanique; Plantes; Botanique. PHYLLOTAXV, OR LUAF ARRANGEMENT. 49 lie 231. The alder cycle. In the alder, birch, sedges, &c., the cycle is not com- plete until the fovrth leaf is reached. The fourth leaf stands over the tirst, the tifth over the second, &c., forming tliree vertical rows. Here call the cycle 4-; 1 denotes the turns, 3 the leaves, and this fraction itself the angular distance (J- of 3(50*'). 232. The cherry cycle. In the cherry, app) , peach, oak, willow, etc., neither the third nor tlie fourth leafj but the sixth, stands over the first; and in order to reach it the thread makes two turns around the stem. The sixth leaf is over the lirst, the seventh over the second, &c., forming five vertical rows. Cnll this the f cycle; 2 denotes the turns, 5 the leaves in the cycle, and the fraction itself the n- gular distance (f of 360°). * 233. The Osaqe-orange cycle. In the common hedge plant, Osape-orange, the holly, evening primrose, flax, etc., we find no leaf exactly over the first until we come to the 9th, aud in reaching it the spiral makes three turns. Here the leaves form eight vertical rows. It is a f cycle ; 3 the number of turns, 8 the number of leaves, and the fraction the angular distance between the leaves (f of 360°). 234. The cycles compared. These several fractions which represent the above cyclf'H fi>—Ti a series as follows: ^, ^, ^, f, in which each term is the sum of the two preceUiu-:. The fiflli terms in order will, therefore, be J>^; aud this arrangement is actually realized iu. 9fi. Phyllotnxy of the i-ono (cycle ;j*,) f Pinns serotiiia. it", cherry nycle (j), as Been from nbuve, forming iit'cessurily thut kind uf utbtivutiou called quinoiintiul. 235. The white pine cycle. In the young shoots of the white pine,
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Keywords: ., bookcentury1800, bookdecade, booksubjectbotany, booksubjectplants
