TO STUDIES IN THE VEGETATION OF THE STATE 



canadensis is a perennial mesopliyte, occurring at a few sta- 

 tions in draws and ravines, and liaving tlie same distribution 

 as Galium tiivctorum. Toward tlie middle of Maj' the large 

 white blossoms of A nemone begin to appear and continue for 

 about a month. Phlox pilosa is a perennial mesophyte found 

 siiarsely in meadows. Its cymes of bright pink or purple 

 fragrant blossoms, with now and then a white flowered indi- 

 vidual, lend a decided tone to the floral aspect. The hypo- 

 crateriform corolla is nectar-bearing and the stamens are un- 

 equally inserted upon its tubes above the style. If allogamy 

 is not secured through insect visitors, autogamy may result 

 from pollen falling upon the receptive stigmas. On account 

 of its grass-like leaves, Phlox practically disappears wath the 

 close of anthesis. Tradesoantia virginiana is noted only 

 sparsely at a few stations in the meadow formation. These 

 plants develop from perennial roots, and during the vernal 

 period produce bunches of showy blue, pink, or purplish flow- 

 ers. On account of its semblance to the facies, the plant dis- 

 appears with the close of anthesis. Another pleiocyclic spe- 

 cies occurring with sparse or subcopious abundance through- 

 out meadow formations is Zizia aurea. This plant begins blos- 

 soming about the middle of May and continues for a month, 

 varying the aspect with yellow here and there. 



Tripsacum dactyloides is found at one of two stations 

 along the margins of the sedge meadow, becoming occasion- 

 ally quite controlling. Its coarse leaves and stems, together 

 with its monoecious flowers, easily distinguish it from any 

 other grass in the prairie. The flowers are proterandrous 

 and xenogamous, the long, roughened stigmas appearing 

 after the stamens. In maturation the upper spikes ripen 

 first and with that portion of the rhachis drop oif, and thus 

 are carried away with the first flood. Tripsacum is peren- 

 nial with very thick, woody rootstalks. 



Calamagrostis canadensis is a hydrophilous, rootstalk 

 pleiocyclic growing in small clumps in the wet meadow. 

 During the flowering period these clumps are especially con- 



