. Chromosomes and phylogeny in Crepis. Crepis; Plants; Chromosomes. 1930] Hollingshead-Babcoek: Chromosomes and Phytogeny in Crepis 23 with the apparently constant odd number of chromosomes and the fairly high proportion of achenes obtained. Pterotheca sancta (2n = 10, fig. 15b) has chromosomes of the C. foetida type. We are indebted to Dr. M. Navashin for kindly giving us the opportunity of reproducing the figure from his slide. In this, the only plant examined, apparently one of the short chromo- some pairs was heteromorphic, the spindle-fiber attachment of one chromosome being median, and o
. Chromosomes and phylogeny in Crepis. Crepis; Plants; Chromosomes. 1930] Hollingshead-Babcoek: Chromosomes and Phytogeny in Crepis 23 with the apparently constant odd number of chromosomes and the fairly high proportion of achenes obtained. Pterotheca sancta (2n = 10, fig. 15b) has chromosomes of the C. foetida type. We are indebted to Dr. M. Navashin for kindly giving us the opportunity of reproducing the figure from his slide. In this, the only plant examined, apparently one of the short chromo- some pairs was heteromorphic, the spindle-fiber attachment of one chromosome being median, and of its mate being submedian. C. dioscoridis, C. pannonica, C. lacera, and C. chond rill aides (fig. 16) have eight chromosomes in garnitures which resemble each other and those of C. burcjensis, C. chrysantha, and C. conyzaefolia of the. C. incana Figure 17. subgenus Catonia (above). The chromosomes of dioscoridis seem to be slightly smaller and those of pannonica slightly larger than those of the other species in this group. C. incana (2« = 16, fig. 17) is probably a tetraploid species since it has 4 similar chromosomes in each set. The chromosomes resemble those of the group just described. The complexes of C. reuteriana, C. praemorsa, C. incarnata and C. palaestina (fig. 18). and of C. pulchra and C. gymnopus (fig. 19), with 8 large chromosomes, are similar, those of C. incarnata and C. praemorsa being probably indistinguishable. Each of these species is characterized by the presence of one pair of long V-shaped chromo- somes. Each has a pair of very small satellites. 'On the shortest chromosome pair of C. pulchra in well fixed, darkly stained material there could be found very small distal satellites. These have not been seen in other species. This pair of chromosomes differed in shape. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectl
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