284 



LOWER KOCEXE FLORAS OF SOUTHEASTERN XOKTU AMERICA. 



by L. C. JohusDU, No. 25811. Grenada fdnua- 

 tion, Grenada, Grenada County, Miss, (col- 

 IcH-ted by E. X. Lowe and E. W. Berry). 

 Collections. — U. S. National Museum. 



RjiAMXis PiRYEAUEXsis Berry, n. sp. 

 Plate LXIV, fi^nire 7. 



Description. — Leaves relatively small, ])road- 

 ly lanceolate in general outline. Length al)Out 

 6 centimeters. Maximum widtli, at or above 

 the mid(Ue, al)out 2. .5 centimeters. From the 

 wid<>st portion the lamina narrows abruptly in 

 botli directions, the apex and base- being about 

 ef|ually acuminate. Margins eutir(> in the hnver 

 half of the leaf, above which they are full and 

 more or less midulate and have somewhat vari- 

 able, small dentate to serrate teeth, which are 

 as numerous as the secondaries in this portion 

 of the leaf. Leaf substance thin but apparently 

 of considerable consistency. Petiole short and 

 stout, about 3.5 millimeters in length. Midrib 

 broad but not prominent, generally straight. 

 Secondaries thin, numerous, regularly spaced, 

 subparallel; about eiglit pairs diverge from 

 the midrib at angles of 25° to 40°, curve regu- 

 larly upward, and are camptodrome close to 

 the margins. Tertiaries very thin and close, 

 percurrent, typically rhamnaceous, joined by 

 numerous very thin nervilles, forming a very 

 fine areolation. 



This species is readily distinguishable from 

 the larger, entire-margineil species of Rhanmus, 

 which characterize the ^Yilcox flora. The only 

 similar form is Rhamnites humelia/orrnis Berry, 

 which occurs m the Wilcox of Texas. That 

 species is al)out the same size as the present 

 species, but has less numerous forked seconda- 

 ries and the margin is merely undulate or 

 feebly crenate and not dentate or serrate. 



Several existing species are very similar to 

 the present form. 



Occurrence. — Lagrange formation (in beds of 

 Wilcox age), Puryear, Henry County, Tenn. 

 (collected by E. W. Berry). 



Collection. — U. S. National Museum. 



RiiAMXis EOLKiMTKTS Berry, n. sp. 

 Plates LXIX, )if,'ure 4, and LXXI, figure 2. 

 Description. — Leaves medimn in size, ovate- 

 lanceolate in outline. Length a])Out 10 centi- 

 meters. Maxinmm width, in the middle part 

 of the leaf, about 3.75 centimeters. A small 

 leaf from the vicinity of Naborton, I^a., is 7 

 centhneters long and has a maximum width of 



l.S centimeters. Aj)e\ narrowed and bluntly 

 pointed. Ba.se about e(|ually jxiinied. Margins 

 full and evenly rotnuled, entire but more or less 

 irregularly undulale. Texture snbcoriaceous. 

 Petiole very stout, cm-vcMJ, abotit 1.75 centi- 

 meters in length. Midril) stout , rather straight, 

 prominent on tlu^ lower sin-face of the leaf. 

 Secondaries stout and prominent, about eight 

 irregularly s])aced ])airs; tliey diverge from the 

 midrib at angles of about 50° and curve regu- 

 larly upward, het'omc parallel with the mar- 

 ghis in tlieir njijier courses, and are campto- 

 drome. Tertiaries of two kinds — relatively 

 stout branches from the midrib, one between 

 each adjacent pair of secondaries, with which 

 they are approximately parallel, becoming thin 

 distad and obsolete about halfway to the mar- 

 gins, and tliin, mmierous, mostly percurrent 

 nervilles. 



This species approaches Rhdninus inarginatus 

 Lescjuereux in ajipearance, but is somewhat 

 smaller and more pouitcd, has thinner petiole 

 and venation and fewer secondaries, which arch 

 at a greater distance from the margii^s, and is 

 further distinguished by the stout tertiary 

 branches fi'om the midrib and ])y the direction 

 of the percurrent nervilles. It is practically 

 identical with the form from Point of Rocks, 

 Wyo., which Lesquereux ' identifies as Conius 

 rhamnifolitt Weber, but which is probably not 

 that species. The Wilcox species is very simi- 

 lar in size and outline Imt has stouter and 

 fewer secondaries, whose angle of divergence is 

 slighth' smaller. 



Occurrence. — Lagrange formation (in beds of 

 Wilcox age), Puryear, Henry County, Tenji. 

 (collected by E. W. Berry), and Ilatchie River 

 near Shandy, Tenn. (collected by L. C. John- 

 son in clav ironstone in 1889). Wilcox group, 

 sec. 28, t". 13 N., R. 12 W., and sec. 13, T. 12 

 N., R. 12 W., De Soto Parish, La. (collected 

 by G. C. Matson and O. B. Hopkins). 



CoUedions.—V. S. National Museum. 



Rhamnus coushatta I'jerry, n. s]). 

 Plato LXVlll, figure 1. 

 Rhamnus clrhunii Lesquereux. Iltillick, in Harris, G. D., 

 and Veatch, A. C, A preliminary report on the 

 geology of Louisiana, p. 280, pi. 47, fig. 1, 1K99. 

 Andromeda eolignUica. Veatch, U. S. Geol. Siu-voy Prof. 

 Paper 46, pi. 17, fig. 2, 190(i. 

 Description. — Leaves oblong-ovate in general 

 outline, the tip pointed and the base rounded 



1 Lesquereux, Leo, The Tertiary flora, p. 2-!4, pi. 42, flg. 6, 1878. 



