234 



LOWER EOCEXE FLORAS OF SOUTHEASTER^- NORTH AMERICA. 



Amtiiii; tile (■i)Ut('iu]K)r:i]'y spocii's of Cassia 

 in llic Wilcox gi-oup, the species uiuler discus- 

 sion reseiiihles more or less the smaller lauc(>o- 

 lute-poiuted species, Cassia faydtcitsis. Cassia 

 marsJi<i]1ensis. and Cassia tt'iinesseensis, but is 

 ])erfectly tlistinct from these. It is somewliat 

 simihir to Citsulpiuites mississippiensis, wliich 

 is, however, a much smaller, coriaceous form 

 with moi'e promiu(Mit venation. Cassia tvil- 

 coxiana .;iv<'rages ahout the same siz(>, hut has 

 less fuJl margins and a broadly rounded instead 

 of a narrowed apex. Sojiltora irilro.riana is 

 generally elliptical in outline and has more 

 numerous secondaries and a more coriaceous 

 textm-(\ Cassia glenni is very similar to Cassia 

 sapindoichs Knowlton of the flora of the Raton 

 formation in the soutlii'rn Rocky Mountain 

 jirovince. Two fine specimens wen' figured 

 from Tennessee by Lesquereux in 1869 and 

 referred to Andromeda. 



Occurrence. — Holly Springs and Early Grove, 

 Mai-shaU County, Miss, (collected by E. W. 

 Berry). Lagrange formation (in beds of Wil- 

 cox age); Somerville, Fayette County, Tenn. 

 (collected by J. M. Safford); li miles west of 

 Grand Junction, in Fayette County, Tenn. 

 (coUected ])y L. C. Glenn (U. S. National Mu- 

 seum, No, 34,5.-)) and E. W. Berry) : bed of 

 Mobley Creek, 4 miles southwest of Trenton, 

 Gibson County, Tenn. (collected bv Bruce 

 Wade); and Wickliffe, BaUard Countv, Kv. 

 (coUected by L. C. Glenn). 



Collections. — U. S. National Museum. 



Cassia glenni major Berry, n. var. 

 Plate CXI, figure 4. 



Description. — Leaflets relatively large, ovate 

 and approximately equilateral in general 

 outline, the base broadly curieate and the tip 

 gradually naiTowed but eventually rounded. 

 Margins entire. Leaf substance thin ])ut ap- 

 parently rigid. Length ranges from 6 to 8 

 centimeters. Maximum width, in the lower 

 part of the leaflet, ranges from 2.2 to 2.8 cen- 

 timeters. Petiohdes stout, expanded, ahout 

 2 inillim(>ters in length. Midrib stout, promi- 

 nent, slightly curved. Secondaries thin, 

 equally spaced, diverging from the midrib at 

 angles of about 4.5°, regularly curved, campto- 

 dromc. Tertiaries thin l)ut well marked. 



Tliis species gi-eatly resembles some of the 

 leaflets of Cassia glenni Beny as well as those 



of Cassia cmarginata Berry, Ixitli of whicli are 

 normally much smaller. It differs from Cas- 

 sia glenni, to which it appears to lie most 

 closely allied, not only in size but in th(> de- 

 velopment of ii petiolule and the prominence 

 of the tertiary venation. The figured type 

 shows two superposed leafl(>ts, whicli if they 

 are from a single h'af, as seems ])robable, ex- 

 hil)it considerable variation in size. 



Occim-ence. — Lagrange formation (in beds of 

 Wilcox age), Puryear, Henry Countv, Tenn. 

 (collected by E. W. Berry). 



Collection. — U. S. National Museum. 



Cassia lowii Berry, n. sp. 

 Plate LII, figures 7-<). 



Description. — Leaflets differing in size and 

 outline, grouped as a single species because of 

 their intimate association in tlie rocks and tlie 

 exact agreement in venation of the different 

 forms. Outline ranges from lanceolate to ovate 

 as a rule slightly inequilateral. Tips range 

 from narrowly pointed through broadly jiointcd 

 to emarginate forms. Bases rather uniformly 

 cuneate pointed. Length ranges from 4. .5 to 7 

 centimeters. Maximum widtli at or generally 

 slightly below the middle, ranging from 1..5 to 

 2.75 centimeters. Margins entire. Leaf sub- 

 stance thin. Petiolule short, greatly enlarged, 

 in many specimens curved, 2 to 3 millimeters 

 in length. Midrib stout throughout its length, 

 sligiitly prominent, generally curved, longi- 

 tudinally striated. wSecondaries thin, scarcely 

 differentiated from the tertiaries; they diverge 

 from the midrii) at angles ranging from 30° to 

 45° and curve in long ascending camptodrome 

 curves subparallel with the lower lateral 

 margins. Tertiaries very fine but well marked, 

 forming an ascending anastomosing network. 

 Ai'eolation fine, mostly pentagonal. 



This species, which is common in the Grenada 

 formation of Grenada, Miss., shows similarities 

 in some of its varial)lo forms to certain other 

 Wilcox species of Leguminoste, and possibly it 

 shonld 1)(^ segregated into two species, thus 

 placing the emarginate leaflets in a distinct 

 categor\-. All the specimens, however, are 

 closely related by identical charactei's of tex- 

 ture and venation, sind as very many modern 

 species show similar variations from acnto to 

 emarginate tips it has seemed better to regard 

 these forms as constituting a single species. 



