. Contributions from the Botanical Laboratory, vol. 11. Botany; Botany. Figs. 3-9.—Somatic metaphase plates of poinsettias: fig. 3, Euphorbia pulcherrima var. white, 20=28; fig. 4, E. pulcherrima var. oak, 2n=28; fig. 5, E. pulcherrima var. oakXwhite, 2n=28; fig. 6, E. pulcherrima, 20=28; fig. 7, E. geniculata, 20=28; fig. 8, E. dentata, 20 = 28; fig. 9, E. heterophylla, 20 = 56. X2000. 682 BOTANICAL GAZETTE [JUNE den (2). This hybrid has pink bracts and leaves similar to the oak variety. No electrophoretic curve is given for this cross. All of the species investigated in this group which have
. Contributions from the Botanical Laboratory, vol. 11. Botany; Botany. Figs. 3-9.—Somatic metaphase plates of poinsettias: fig. 3, Euphorbia pulcherrima var. white, 20=28; fig. 4, E. pulcherrima var. oak, 2n=28; fig. 5, E. pulcherrima var. oakXwhite, 2n=28; fig. 6, E. pulcherrima, 20=28; fig. 7, E. geniculata, 20=28; fig. 8, E. dentata, 20 = 28; fig. 9, E. heterophylla, 20 = 56. X2000. 682 BOTANICAL GAZETTE [JUNE den (2). This hybrid has pink bracts and leaves similar to the oak variety. No electrophoretic curve is given for this cross. All of the species investigated in this group which have similar surfaces on their latex particles, as shown by the resemblance of the curves and the position of the isoelectric points (table I), have also like chromosome numbers. Although the curve of E. gemculatais somewhat divergent, it likewise has a diploid number of 28. On the other hand, E. heterophylla appears to be tetraploid with a somatic complement of 56 chromosomes, and it is therefore genetically very different from the other species. TABLE I Chromosome numbers and isoelectric POINTS of poinsettias Species E. deotata E. pulcherrima • E. pulcherrima var. white E. pulcherrima var. oak • • E. pulcherrima var. whiteXoak. E. geoiculata E. heterophylla Latex isoelectric POINT (pH) 3 9 3 3 3 3 4 8 9 9 7 7 I Chromo- some NUM- BER (2N) 28 28 28 28 28 28 56 In this connection it is interesting to note that Zade, by the im- munological reactions of the seed proteins (16), was able to separate re varLs species of Triticun. and into groups which are dentical with those already formulated on a taxonomic basis. In a study of the chromosomes of TriHcum^ Sakamura (12) and later SAX (13 reported that each group has different chromosome num- bers The haploid numbers are as follows: emkorn group = 7, em- ^e 'groupixl and spelt group = .x. Kihara (7) likewise showed The ime Vol relationship between the eh,omo»„e nurnbe s of different species of Avena and the groups propose
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