HARSHBERGER— STUDY OF THE CLOVERS. 141 



Four red clover plants had leaves with glabrous (smooth) petioles 

 and 96 red clover plants of my collection had petioles that were 

 hirsute. Five clover plants in one hundred had blotched leaves and 

 95 were unblotched. This descriptive presentation of the statistical 

 study of one hundred red clover plants has been adopted instead of 

 the tabular form to save the cost of the printing of the accumulated 

 data in the form of a table. 



Clover Habitats and Growth Forms. 



The various habitats described with reference to the species of 

 clover found growing in them were taken from the descriptive labels 

 of the herbarium sheets found in the herbarium of the Botanical 

 Department, University of Pennsylvania, the Academy of Natural 

 Sciences of Philadelphia, the U. S. National Herbarium, Washington, 

 D. C, the New York Botanical Gardens, and Kew Gardens, London, 

 England. The habitats are arranged beginning with the hydrophytic 

 ones and ending with the driest, most xerophytic ones. 



JVct Places. — Trifolium amplectens (California), anodon (Cali- 

 fornia), arizonicum (California), barbigerum (California), bolanderi 

 (California), cyathiferum (California, Oregon), harneyensis (Ore- 

 gon), hozvellii (Oregon), megacephalum (Oregon), melananthum 

 (California), microcephahtm (Washington), oreganum (Washing- 

 ton), pauciflorum (Washington), pedunculatum (Oregon), rydbergii 

 (Montana), scabrellum (California), splendens (California), trun- 

 ■catum (California), variegatum (California). 



Salt Marsh Edge. — Trifolium flavulum (California). 



Gravelly River Bar. — Trifolium heterodon (Washington). 



Meadows. — Trifolium andrewsii (California), beckwithii (Ore- 

 gon), harneyensis (Oregon), involucratum, (Washington), longipes 

 (California), macrcei (California), monanthum (California), plu- 

 mosum (Idaho), polydon (California), refiexum (Arkansas), rusbyi 

 (California), spinulosum (California), tridentatum (California), 

 triste (California), wormskioldii (California). 



Pampas. — Trifolium w^tthewsii (Argentina) . 



Prairies. — Trifolium altissimum (Washington), amphianthum 

 (Texas), bejariense (Texas), carolinianumr (Texas), douglasii 

 (Washington), pauciflorum (Cahfornia). 



