EQUISETALES— OALAMARIE.E— ANNULARIA. ] 63 



Several specimens appear to represent a variation, perhaps of varietal 

 rank, which is presumably that designated by Lesquereux in the list of 

 plants from Henry County, Missouri,^ as Annularia longifolia var. angustifolia. 

 The verticils, which have the diameter of the normal type, seem to be 

 rather fewer leaved, the leaves being- more slender and tapering from the 

 middle upward to an acute point. The midrib is quite distinct. In form 

 it approaches very close to A. radiata Brongn., though really bound by its 

 essential characters to A. stellata. 



At first I was disposed to reg'ard this form as a case of inrolled margins 

 in the latter species, as indeed seems to be the condition in some of the 

 specimens labeled with the name of this variety in the collections of the 

 United States National Museuni; but a more careful examination leads me 

 to the conclusion that the continuance of its varietal distinction may serve a 

 useful purpose. Though somewhat larger, it strongly resembles the figures 

 of Annularia elegans given by Grand 'Eury in his most interesting work on 

 the flora of the basin of Grard.^ The plant listed by Mr. Gr. Hambach^ as 

 Annularia angustifolia in the enumeration of the Missouri fossil flora is prob- 

 ably this variety. 



Localities. — Deepwater, U. S. Nat. Mus., 5448; Pitcher's coal bank, U. S. 

 Nat. Mus., 5447. 



Annularia sphenophylloides (Zenk.) Gutb. 



1699. Rubeola mineralis Luidius, Lithophyl. Brit., p. 12, no. 202. 



1771. Rubia sylvestris Volkmann, Walcli, ISTaturgesch. Verst., vol. iii, p. 117, ])1. oj, fig. 1. 



ISOi. Rubia sylvestris Parkinson, Org. Rem., p. 428, pi. v, fig. 3. 



1828. Annularia brevifolia Brouguiart, Prodrome, p. 156. 



1819. Annularia brevifolia Bronguiart, Tableau, p. 53. 



1853. Annularia brevifolia Brongn., iSTewberry, Annals Science, Cleveland, vol. 1, p. 97. 



1876. Annularia brevifolia Brongn., Heer, Fl. Foss. Helv., p. 51, pi. xix, figs. 6-9.- 



1880. Annularia brevifolia Brongn., Ferd. Eoemer, Lethaea Geogn., vol. 1, p. 150, 



fig. 7. 



1880. Annularia brevifolia Brongn., SichimTper, in Zittel: Handbucli Paheont., vol. ii, 



p. 167, fig. 127. 



1883. Annularia brevifolia Brongn., Schenk, in Richthofen : China, vol. iv, p. 233, pi. xl. 



1887. Annularia brevifolia Brongn., Stnr, Calaniar. Schatzlar. Sch., p. 223, pi. xvib, 



figs. 3, 4. 



1888. Annularia brevifolia Brongn., Toula, Die Steinkohlen, p. 204, pi. v, fig. 14. 



> Coal Flora, vol. 3, p. 879. 



2 g^ol. pal. bassin boaill. Gard, 1890, p. 201, pi. xvii, fig. 6. 



3 Bull. Geol. Surv. Missouri, No. 1, 1890, p. 83. 



