OLDKK POTOMAC OF VIKdlMA AM» .MAliVLAND. 4S9 



The followiiiii" s|)C('i('s wore found at these localities: 



Araucarit cs a(|uit'iisis Font , 1 a])('cini('n. 



Baicropsis i'oliosa Font 1 spcciuu'ii. 



Carpdlithus lirookciisis Fdiit _ 2 s])('ciiiu'iis. 



ColastrDpliyllum allja'domus Ward n. sp 1 s])('ciin('n. 



Ficopliyiluin cucalypt'oidcs Font- _ _ o spccinicns. 



Gh'ptostri)l)iis ('I'axodiuiu) lirnokciisis (Font.) Ward _.!.'■! spccinicns. 



Glyptostrohns l)ru()konsis angustil'olius (Font.; Kn .") sijccinicns. 



Gl}'pt()st.ri)l)us ranu).sus Font. n. comb. [Taxodiuin ({il_v|)t,ostrohu.s) 



ramosnni Fonl.l 1 specimen. 



Sapindopsis nia>inil'olia Font 3 specimens. 



Sa])indopsis tcmiincrvis Font 1 specimen. 



Sapindojisis variabilis Font 2S specimens. 



Sequoia cycadopsis Font 1 specimen. 



Sphenolepidium Knrriamim (Dunk.) Heer 1 specimen. 



Sphenole))i(lium Sternl)cr<i'ianum dcnsifoiium Font 3 specimens. 



C'ELASTRorilYLLUM ALU.EDOMIS Wardu. S|)." 



PI. CVIII, Fi,i;. :;. 

 Glyptostrobus liHooKKNsis AXGVSTiFOLUs (Fontaine) Knowlton. 



PI. CVIII, Fig. 4. 

 18S9. Taxodium {Glyptostrobus) hrooJcense angustifoliuin Font. : Potomac Flora 



(Monogr. U. S. Geol. Surv., Vol. XV), p. 256, pi. clxvii, figs. 1, la. 

 1898. Ghiptostrohus hrool-ense a ngust't folium (Font.) Kn.: Bid!. U. S. Geo]. Surv., 

 No. 152, p. 112. 

 Five specimens of this plant were collected by Professor Ward and 

 Mr. Mason in the light-colored clays that immediately overlie the orig- 

 inal Mount Vernon plant bed and that belong to the Brooke horizon. 

 The best of these is shown in PI. CVIII, Fig. 4. 



"In my .study ot these collections mentioned above (p. 493) I provisionally identified this leaf with 

 CelastrofliijUuia Brittonianum Holliclv (Newberry, Flora of tlie Amboy Clays: Monogr. U. S. Geol. Surv., Vol. 

 XXVI, p. 10.'), pi. xlii, figs. 37, 38, 46, 47), but did not describe it. Professor Fontaine returned it with the 

 request that I treat it, a.s he W!i.s not acquainted with that species. A closer examination shows that it is 

 not that spe(^ics, but a new one. It may be descrilied as follows: 



Ijeaf ovate-lanceolate, rounded at the base and apex, uncqual-side<l, crenate-toothed, 4 cm. long exclusive 

 of the petiole, w'hich is wanting, IG mm. wide at the middle; midrib strong and straight, secondary nerves 

 camptodrome, deliciitc. curving forward, forking and anastomosing midway between the midril) and the mar- 

 gin, the tiranchcs forming festoons along the margins. 



Tills pretty little leaf, perfect except the petiole, w'as collected on May 14, 1893 (see p. 494), at the 

 locality previou.sly discovered by Mr. William Hunter in the White House Bluff. The name alludes to 

 the locality. The foundations of the former "White House" mav' still be seen on the banli of the Potomac 

 at the foot of the bluff not far from the plant locality. This house was once a favorite resting place for fisher- 

 men and river men, and later a resort for excursionists from .\lexandria and Washington, and the pavilion 

 erected for dancing had not yet fallen m at the time of my first visit to the place. — L. F. W 



