. Brigham Young University science bulletin. Biology -- Periodicals. 100 Bricham Young University Science Bulletin in awn length of the putative parents (see Table 12). Several additional collection sites had popu- lations with intiogression patterns similar to that of Raymondville, including Pavvelekville, Pettus, and Rio Grande City (Fig. 60). Chloris andropogonoides x C. verticillata The collection site for this population is in Edwards County, Texas, on the grounds of the Texas A and M Experimental Station about 25 miles northwest of Rock Springs (Fig. 60). While "good" Cliloris
. Brigham Young University science bulletin. Biology -- Periodicals. 100 Bricham Young University Science Bulletin in awn length of the putative parents (see Table 12). Several additional collection sites had popu- lations with intiogression patterns similar to that of Raymondville, including Pavvelekville, Pettus, and Rio Grande City (Fig. 60). Chloris andropogonoides x C. verticillata The collection site for this population is in Edwards County, Texas, on the grounds of the Texas A and M Experimental Station about 25 miles northwest of Rock Springs (Fig. 60). While "good" Cliloris andropogonoides and C. verticillata arc present in abundance, C. ciicul- lata was not observed in the area. The mass collection of plants made in this area is repre- sented in Fig. 64. Unlike previous scatter diagrams, the inter- mediate populations shown in Fig. 64 are not of obvious parentage. On the basis of the species present, it would be expected that the recombinants would fill the areas between C. verticillata and C. andropogonoides in the graph, though certainly more long-awned inter- mediates similar to C. andropogonoides are present than in either of the previous two popu- lations discussed. The unexpected position of the remaining intennediate plants might be the result of the presence at some time in the past of C. cucuUata in the area, still showing its in- fluence on the remaining population. A more likely possibilit\', however, is that the inter- mediates merely represent recombinants of some of the more extreme morphological \'ar- iants of C. andropogonoides and C. verticillata. This population was collected when the plants were in seed and cytological studies were not possible. I have been unable to find additional popu- lations that I feel are representative of this species combination. Chloris cucullata is nearly ubiquitous in areas in which C. andropogonoides and C. verticillata arc sympatric and usually enters into the introgression pattern when present. C
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