316 Systematic Paleontology 



Equisetum Burchaedti (Dunker) Brongniart 

 Plate XLI, Figs. 3-6 



Eguisetites Burchardti Dunker, 1846, Monog. norddeutsch. Wealdenbild., 



p. 2, pi. V, fig. 7. 

 CarpoUthus cordatus Dunker, 1846, loc. cit., p. 22, pi. ii, figs. 7, 10. 

 CarpoUthus Huttoni Dunker, 1846, loc. cit., p. 22, pi. ii, fig. 8. 

 CarpoUthus Lindleyanus Dunker, 1846, loc. cit., p. 22, pi. ii, fig. 7. 

 Equisetum Burchardti Brongniart, 1849, Tableau, p. 107. 

 Equisetites Burchardti Unger, 1850, Gen. et Sp., p. 59. 



Eguisetites Burchardti Ettings., 1851, Haidinger Abh.., vol. iv, Abth. 1, p. 65. 

 Equisetites Burchardti Ettings., 1852, Abh. k. geol. Reichs., Band i, Abth. 



iii, 1852, p. 10, pi. i, figs. 3, 4. 

 Equisetum Burchardti Schimper, 1869, Traite Pal. Veget, tome, i, p. 264; 



tome iii, 1874, p. 453. 

 Cycadinocarpus ? cordatus Schimper, 1870, Traite Pal. Veget., tome ii, p. 



211. 

 Cycadinocarpus f Huttoni Schimper, 1870, loc. cit., p. 210. 

 Cycadinocarpus Lindleyanus Schimper, 1870, loc. cit., p. 210. 

 Equisetum Burchardti Schenk, 1871, Palseont., Band xix, p. 205 (3), pi. 



xxii (i), figs. 1-5. 

 Equisetites Burchardti Renault, 1882, Cours bot. foss., tome ii, p. 151. 

 Equisetites Burchardti Saporta, 1890, Compt. Rend., tome cxi, p. 250. 

 Equisetum virginicum Fontaine, 1890, Mon. U. S. Geol. Surv., vol. xv, 1889, 



p. 63, pi. i, figs. 1-6, 8; pi. ii, figs. 1-3, 6, 7, 9. 

 Equisetum marylandicum Fontaine, 1890, Mon. U. S. Geol. Surv., vol. xv, 



1889, p. 65, pi. ii, fig. 10. 

 Rhizome of Equisetum sp. ? Fontaine, 1890, Mon. U. S. G«ol. Surv., vol. xv, 



1889, p. 66, pi. clxx, fig. 8, 

 Equisetites Burchardti, Seward, 1894, Wealden Fl., pt. i, p. 27, pi. i, figs. 



5, 6. 

 Equisetum Burchardti Saporta, 1897, Fl. Foss. Port, p. 66, pi. xv, fig. 7. 

 Equisetum, virginicum Fontaine, 1899, in Ward, 19th Ann. Rept. U. S. Geol. 



Surv., pt. ii, p. 650 pi. clx, fig. 1. 

 Equisetum virginicum Fontaine, 1906, in Ward, Mon. U. S. Geol. Surv., vol. 



xlviii, 1905, pp. 483, 486, 519. 

 Equisetum marylandicum Fontaine, 1906, in Ward, Mon. U. S. Geol. Surv., 



vol. xlviii, 1905, pp. 517, 557, pi. cix, fig. 10. 



Description. — " Equisetites caule tenni multiarticulato striate, striis 

 subacutis, viii-x, seque distantibus, vaginis tumidis lanceolato-dentatis/' — 

 Dunker, 1846. 



Stems branching freely, the branches slender or approaching the 

 stems in size, ranging from 1.5 mm. to 8 mm. in diameter. Internodes 

 .8 cm. to 2.2 cm. in length. Sheaths slightly swollen, 2 mm. to 10 mm. 



