MONARDA FISTULOSA. 



115 



vials receiving but 1 visit to 26 for those of P. gracilis in the natural position. 

 The latter as the standard was about twice as attractive as P. secundi- 

 florus, P. barbatus, and Scrophularia in a mixed bouquet. 



Table 81. — Competition of Pentstemon gracilis standard and a mixed bouquet. 



MONARDA FISTULOSA. 



Comparison. — A large number of species were used in competition 

 with Monarda, in natural, bouquet, and group installations. The only one 

 to resemble it at all closely was Gilia aggregata, with long, tubular pink 

 corollas in an elongated cluster. The gamopetalous flowers of Gentiana 

 parryi and Campanula rotundifolia departed widely in shape, color, and 

 arrangement, as did also the zygomorphic Delphinium and the actino- 

 morphic Geranium, Chamaenerium, and Calochortus gunnisoni. This was 

 essentially true also of the three composites Achillea millefolium, Aster 

 bigelovi, and Erigeron macranthus, the first with white rays and the last 

 two with purple ones (plates 6, 7, 8, and 10). 



Experiments. — These include natural and bouquet competition, and 

 the competition results of the Monarda calendars given in the preceding 

 chapter. 



Summary. — In natural competition with Geranium caespitosum, Cam- 

 panula rotundifolia, and Achillea millefolium, Monarda was slightly less 

 attractive than Geranium, owing to the decided preference of Bombus and 

 Halictus for the latter. When Monarda was the standard in competition 

 with a bouquet of Gentiana, Erigeron, and Calochortus, it was about twice 



