6 Muhlenbergia, Volume 9g 
is omitted, although Lathyrus, Lupinus, Medicago and Pisum, 
also common and important genera, are well illustrated. In the 
text on page 77 we find Medicago and Trigonella inentioned and 
a reference to the figures. The seedlings of Medicago sativa, pl. 
7. f/ 15. does not resenble a seedling grown from ordinary com- 
mercial alfalfa seed of the present day, which is supposed to be 
Medicago sativa. Under Trifolium we have only the word 
“idem,” referring to it as the same as Trigonella and Medicago, 
but without a figure of any species of Trifolium. 
The first leaf of most of the species of American clovers 
resembles Medicago. ‘The group illustrated here may be con- 
sidered typical, but other groups vary considerably from these. 
Although the genus Trifolium has always been considered to 
have the first leaf simple, we have found that iu one of the 
groups to be discussed in a later paper, the first leaf is distinctly 
trifoliolate. This last observation is interesting, as it was evi- 
dently not observed by De Candolle, since he states the follow- 
ing on pages 8% and 89: ‘Les Trifles, dont j’ai observe ’une diz- 
aine appartenant ’a toutes les sections du genre, ne different point 
des Trigonelles et des Melilots par les caracteres generaux.” 
The cotyledons in all the groups of clovers that we have 
studied are very similar. They are somewhat fleshy and g'ab- 
rous, and generally oblong or elliptical in outline. The mar- 
gins are entire. The difference is chiefly in the size, the length 
-f the petiole, and the manner in which it is attached to the 
lamina. 
The plate here shown is prepared especially to show that 
7. amoenum and T. dichotomum are distinct species. 7. amoe- 
num, f. 1. 1s densely hairy on both surfaces of the first leaf and 
has a broad notch at the apex, while 7: dichotomum is glabrous 
on both surfaces and slightly emarginate. 
The drawings will also show that there is a good specific 
character in the first leaf. The trifoliolate leaves which develop 
later vary to a very great extent in shape and margination, but 
the character of the primordial leaf is constant. Occasionally 
we have found a monstrosity in a seedling having three cotyledons 
