HARSHBERGER— STUDY OF THE CLOVERS. 139 



Seedling Clovers. 



An examination of the large number of seedlings raised from seeds 

 obtained from the different places mentioned above shows that they 

 may be classified into several groups according to the sizes of the 

 cotyledons. The following details are taken from the natural-sized 

 drawings of all the seedlings raised during their experimental study 

 (Plates I, II, III). The species of Trifolium with large cotyledons 

 are : alexandriniun, angnstifolium, incarnatum, pannonicum, pratense. 

 Those with middle-sized seed leaves are : agrarium, alpestre, angusti- 

 folium, maritimum, medium, procumhens, ochroleucum, reclinatiim, 

 spumosumr, striatum, suhterraneum. The clovers which showed small 

 cotyledons on germination are : arvense, aureum, badium, hdansce, 

 hocconi, campestre, cernuum, elegans, filifonne, glomeratum, john- 

 stoni, lupinaster, minus, montanum, patens, perreymondt, resupi- 

 natum, rubens, scabrum, spadiceum-, sujfocatum. The clovers with 

 narrow cotyledons are : agrarium, angustifolium, bocconi, campestre, 

 filiforme, glomeratum, maritimum, patens, reclinatum, repens, sca- 

 brum. Those with broad seed leaves are : alexandrinum, alpestre, 

 badium, elegans, incarnatum, lupinaster, minus, ochroleucum, pan- 

 nonicum, pratense, resupinatum, spadiceum, spumosum, stellatum. 

 The length of the hypocotyl and radicle together varied from 7 mm. 

 in T. johnstoni, 8 mm. in T. scabrum, to 60 mm. in T. incarnatum. 

 All of the radicles developed root hairs in greater or less numbers. 

 The accompanying plates (Plates I-III) give the general form and 

 appearance of the clover seedlings examined. 



Morphologic Variations in the Clovers. 



It is not intended to make an exhaustive survey of morphologic 

 variations in the clovers, but to briefly describe those which came 

 under the personal observations of the writer. 



Double-headed Red Clover. — In July, 191 1, at Belmar, N. J., were 

 found two red clover plants in which the heads were double. The 

 twin heads were separated down to the middle and were united by 

 their lower halves. The flowers were of the usual structure and 

 color. 



