FLORA OF THE WOODBIXE SAND AT ARTITITRS BIATFF, TEX. 



171 



This description was based upon very frag- 

 mentary material from the Atane beds of Green- 

 land, from wliieli, nevertlieless, Ileer reeon- 

 strueted the supposed outline of the perfect 

 leaf. To judu:e by the specimens referred to 

 this species by Lesquereux and Newberry it 

 was an exceedin<ily variable form. In plan it 

 is trilobate, but the subsidiary lobes ileveloped 

 upon both the median anil the lateral lobes in 

 some specimens obscure this trilobate character 

 and suggest Cisftites parvlfoliuK Berry, of the 

 Albian of America and Europe; Ci.tsites 

 dentatolohatiis Lesquereux, of the Dakota sand- 

 stone; Cissites panduratufi Knowlton, of the 

 Vermejo, Mesaverde, and Ripley formations; 

 or Cissus vitifolia Velcnovsky, of the Ceno- 

 manian of Bohemia. 



The primaries are stout and three in number; 

 they may diverge from the top of the stout 

 petiole or be suprabasilar; in many specimens 

 the branches of the laterals approach so near 

 the base that the leaves have the appearance of 

 being palmately ."S-veined. 



This species is common but fragmentary in 

 the Raritan formation; it ranges from 7 to 10 

 centimeters in length and from 6 to 12 centi- 

 meters between the tips of the main lateral 

 lobes. The sinuses are all rounded, and the 

 main ones may be deep or shallow. The frag- 

 ment from Long Island referred to this species 

 by Hollick is, as he remarks, exceedingly unsatis- 

 factory and doubtful. The species occurs also 

 in the Dakota sandstone of Kansas, and a 

 closely related variety has been foimd in the 

 Magothy formation of Maryland. Typical 

 material is present in the Tuscaloosa formation 

 of Alabama. It is represented by a scanty 

 amount of incomplete material at Arthurs 

 Bluffs, Tex. 



The genus Cissites was erected b}' Heer in 

 1866 for the species Cissites insignis, from the 

 Dakota sandstone of Nebraska, which present- 

 ed points of affinity with the genus Cissus of 

 Linne. It is a largelj' developed t3"pe in the 

 upper half of the Cretaceous sj^stem but was 

 replaced after Eocene time by forms which are 

 definitely referable to modern allied genera 

 such as Cissus and Vitis. 



Order MALVALES. 



FamUy STEBCULIACEAE. 



Genus STERCtTLIA Llnne. 



Slerculia luguliriK Lesquereux? 



Pint.' X.W'VI. ti!,Mirc (i. 



Slerniha liigubrig lx?,s(iupreux. The rretacoouB an^l Tit- 

 liary floras, p. 81, pi. fi, fiss. 1-.3, 188.1. 

 Herry, Torrey Hot. Cliil) Hull., vol. 3n. p. 3n!». pi. :u, 

 fiR. 2, 1912. 



Leaves variable in size, often large, deeply 

 palmately trilobate. Length from \2 to 24 

 centimeters. Texture coriaceous. Margins 

 entire. Base cimeate, decurront. Lobes nar- 

 row linear-lanceolate, acuminate. Primaries 

 three, stout, prominent, diverging from the top 

 of the thick petiole at acute angles. Second- 

 aries thin, camptodromo, mostly inunersed in 

 the thick substance of the leaf. 



This striking species was described from 

 specimens collected in the so-called Dakota 

 sandstone near Golden, Colo. 1 1 is ver}' similar 

 to Sterculia ciiffwondensis Berry,''* of the ^fag- 

 othj^ formation of New Jersey and Delaware. 



This species is apparently represented at 

 Arthurs Bluff, Tex., by the single specimen 

 figured, which agrees very well with the Da- 

 kota sandstone forms of Sterculia luguhris. 

 The reference is queried, as the specimen may 

 represent an exceedingh' slender, elongated, 

 almost parallel-margined form of Aralia well- 

 infjtoniann Lesiiuereux, which is so common at 

 this locality. 



Order THYMELEALES. 



Family LATIRACEAE. 



Genus BENZOIN Fabricius. 



Benzoin venustum (Lesquereux/ Knowlton. 



Plate XX.XVITI, figure 2. 



Lindera venusia Lesquereux, U. S. Geol. Survey Mon. 17, 



p. 95, pi. 16, fiss. 1, 2, 1892. 

 Benzoin venustum (Lesquereux) Knowlton, U. S. Geol. 



Survey Bull. 152, p. 17, 1898. 

 Berry, Torrey I?ot. Club liull., vol. ."9, p. 399, 1912. 



Leaves of variable size, trilobate, separated 

 by narrow ultimately rounded sinuses about 



■1 liorry, E. W., New York Bot. (Jarden Bull., vol. 3, p. 8S, pi. «, tic. 5, 



1(K«. 



