OLDER POTOMAC OF VIRGINIA AND MARYLAND. 563 



mm., the true base not being shown. There are indications on the sides 

 of teeth of the same nature as in P. marylandica. The fragment is some- 

 what puckered longitudinally, which obscures the nerves. The latter 

 seem to be more numerous and more closely placed in the central part of 

 the leaf than they are in P. marylandica, and to be stronger here. This 

 specimen is shown in PL CXVII, Fig. 7." 



The true place of this peculiar plant is doubtful. In a number of 

 points it resembles some forms of Plantago, and it may be compared with 

 P. virgmica L. From this resemblance the generic name is formed. The 

 inflorescence also seems to indicate an affinity with Plantago. Several 

 specimens show this inflorescence. The most complete form is given in 

 PI. CXVIII, Fig. 1, which shows an oblong elliptical imprint of a spike- 

 like form, borne on a peduncle which is only partially preserved. This is 

 associated with leaves of the plant now in question. In Fig. 2, similar 

 forms, mounted on long, slender, naked scapes, may be seen attached to 

 the rootstock from which the leaves arise. Those seen in Fig. 2 are incom- 

 plete, the tops being broken oft". The one given in Fig. 1 is nearly entire 

 and is oblong elliptical in form, with a length of 22 mm. and a width of 12 

 mm. It seems to have been a chaffy spike, but it is not well enough 

 preserved for the details to be made out. The peduncles, as shown in Fig. 

 2, are at least 4 cm. long and not more than 1^ mm. wide. In shape this 

 spike agrees pretty well with an undeveloped spike of Plantago virginica 

 L. Fig. 2 gives the most complete specimen of the plant, as it shows the 

 rootstock with leaves and scapes rising from it. 



Prote^phyllum dentatum Fontaine. 



PL CXVIII, Figs. 3, 4. 



1889. Protexfhyllum dentatum Font.: Potomac Flora (Monogr. U. S. GeoL Surv., 

 VoL XV), p. 286, pi. clvi, fig. 7; pi. cLxxii, figs. 1,4; pi. clxxiii, figs. 12, 14. 



Fifteen specimens of Protecephyllum dentatum occur in the collections 

 now being described. They are in the form of more or less complete, 

 detached leaves. Some of these are more complete than those described 

 in Monograph XV. The leaves of this plant, as there stated, are among 



« Professor Fontaine was in doubt as to whether this specimen really belonged to P. marylandica, and 

 left it undetermined. An examination of the specimens in the light of the drawings leaves no doubt in my 

 mind on this point, and I take the responsibility of including it. — L. F. W. 



