Archive image from page 522 of A dictionary of the flowering. A dictionary of the flowering plants and ferns . dictionaryofflow00will Year: 1919 PHYLLO- 5°7 Phyllarthron DC. Bignoniaceae (4). 6 Madag., Mascarenes. The 1. is reduced to a jointed winged petiole. Phyllepidum Rafin. Amarantaceae (inc. sed.). Gen. dubium. i N. Am. Phyllis L. Rubiaceae (n. 7). i Canaries, Madeira. Phyllitis Ludwig. Polypodiaceae. 10 trop. and subtrop. Phyllo- (Gr. pref.), -phyllous (suff.), leaf; -clade, a stem structure usu. ± flattened and serving 1. purposes, Asparagus, Baccharis, Bos- siaea, Carmichaelia, ffibb
Archive image from page 522 of A dictionary of the flowering. A dictionary of the flowering plants and ferns . dictionaryofflow00will Year: 1919 PHYLLO- 5°7 Phyllarthron DC. Bignoniaceae (4). 6 Madag., Mascarenes. The 1. is reduced to a jointed winged petiole. Phyllepidum Rafin. Amarantaceae (inc. sed.). Gen. dubium. i N. Am. Phyllis L. Rubiaceae (n. 7). i Canaries, Madeira. Phyllitis Ludwig. Polypodiaceae. 10 trop. and subtrop. Phyllo- (Gr. pref.), -phyllous (suff.), leaf; -clade, a stem structure usu. ± flattened and serving 1. purposes, Asparagus, Baccharis, Bos- siaea, Carmichaelia, ffibbertia, Lathyrus, Leinna, Miiehlenbeckia, Oxalis, Phyllanthus, Phyllocladns, RHSCHS, Semele; -de, a petiole flattened and green, taking over , Acacia, Oxalis; -dy, change of fl. organs to 1.; -me, a leaf structure; -taxy, the arrange- ment of the 1. upon the stem. It follows definite rules, esp. in flowering-plants, though it varies within certain narrow limits. The 1. may be several at each node (in whorls), or two (usu. opposite), or one (alternate). When the stem is so short that the 1., as in the primrose or dandelion, are all crowded together and spring from the level of the ground, they are said to be 'radical.' In the first two cases the I. at one node usu. stand above the gaps at the node below. In the case of alt. 1. there is found to be a fairly constant angle between each 1. and the next one above it, in Plantago (fig.) this angle is f of the whole circumference measured the nearest way. This fraction f represents the phyllotaxy. Twist- ing excepted the 1. will stand in 8 vertical rows, each divided from the next by \ of the circum- ference. Leaf 2 will be f, 3 will be f, 4 will be f, 5 will be V-> 6 will be Y-, 7 will be V, 8 will be -V~> and 9 will be -\4-, of the circumference from leaf i, immediately over it, and three turns of the spiral aboveit. Hence the rule for determining phyllotaxy: start from any 1. A and draw a spiral round t
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