130 NINTH REPORT. 



Beal's Michio-an Flora, 1904, "St. Clair Co., W. W. Ashe; Keweenaw Co., 

 O. A. Farwell.^' 



In Beal's Michigan Flora, 1904, the following species of Crataegus, besides 

 those mentioned, reported as occuring in Michigan by various collectors, 

 have not been seen from the state by the writer: 



C. acutilol)a, Sargent, Detroit, O. A. Farwell. 



C. altrix, Ashe, Detroit, 0. A. Farwell. 



C. brevispina, (Dougl.) Farwell, Keweenaw Co., 0. A. Farwell. 



C. coccinea, L. Common throughout. 



C. Crus-galli, L. Common throughout. 



C. decans, Ashe, Detroit^ 0. A. Farwell. 



C. fihpes, Ashe, St. Clair Co., W. W. Ashe. 



C. macrantha, Lodd. Common throughout. 



C. nuperia, Ashe, Detroit, 0. A. Farwell. 



C. obtecta, Ashe, Detroit; St. Clair Co., W. W. Ashe. 



C. onusta, Ashe, St. Clair Co., W. W. Ashe. 



C. pastora, Sargent, Detroit, O. A. Farwell. 



C. prunifolia (Marsh), Pers., Detroit, O. A. Farwell. 



C. pubipes, Ashe, St. Clair Co., W. W. Ashe. 



C. redolans, Ashe, Detroit, 0. A. Farwell. 



C. rotundifolia (Ehrh.), Borck., Grand Rapids, Island Lake, C. F. Wheeler. 



C. virella, Ashe, St. Clair Co., W. W. Ashe. 



Judging from the material which I have seen from other parts of the 

 lower peninsula and which is too incomplete for critical study, it seems 

 probable that there are still in the southern part of the state a large number 

 of unnamed species, and when these are all known it will not be surprising 

 if the flora of Michigan is found to contain a much larger number of species 

 than are now described. 



The collection of Crata?gus presents no practical difficulty, but it requires 

 care and patience if the material is to be really useful for study. As plants 

 of the same species often appear so different in the spring' and autumn, it 

 is necessary to mark with a number written on a parchment label or cut 

 in the bark, each plant from which specimens are taken, so that there can 

 be no mistake in securing flowering and fruiting specimens from the same 

 individual. When the flowers are gathered the stamens and styles should 

 be counted and the average number in several flowers recorded in the field 

 note book. The average diameter of the expanded flowers should also be 

 recorded, and special care should be taken to note carefully the color of the 

 anthers, that is, whether dark or light rose color, pink or pale yellow. The 

 color of the anthers is important as furnishing a good character for the de- 

 termination of species. This soon fades and it is entirely lost in drying. 

 The color in some species changes even before the flowers fade, and the safest 

 way is to take notes on the color of the anthers before the petals expand. 

 The autumn specimens should be gathered when the fruit is ripe or nearly 

 ripe. Specimens gathered in summer with only partly grown fruit are ab- 

 solutely worthless for the determination of species, and time spent in pre- 

 paring such specimens is wasted except that they may record the exist- 

 ence of plants needing further investigation. 



When the fruiting specimen is collected, the shape, size (length and di- 

 ameter), and the color of the fruit should be noted, and whether it is prui- 

 nose or not. Notes should be made also on the color of the flesh and on its 

 character, whether succulent, dry or juicy, sweet or bitter. The field notes 

 should give the date when the flowers and fruits are gathered; the size and 



