196 THE POTOMAC OR YOUNGER MESOZOIO FLORA. 



seen 18'^'" and over, maximum width T" and over, usually remotely placed, 

 generally opposite, rarely subopposite, going off noi'mally at an angle of 

 about 45°, but often from pressure distorted in position; nerves compara- 

 tively few, forking at or near the base, parallel to near the apex, where 

 they are slightly crowded. 



Localities : Fredericksburg ; Kankey's ; near Telegraph Station ; 72d 

 mile-post, near Brooke ; Deep Bottom ; red-clay ball in banks of Dutch 

 Gap Canal ; fishing hut above Dutch Gap Canal. 



This splendid plant is quite widely diffused, but it is rare at all points 



except Fredericksburg, where it is not uncommon ; all the larger specimens 



figured come from this latter locality. PI. LXXV, Fig 1, shghtl}^ restored, 



shows that the leafy twigs must have attained great dimensions, for this is 



evidently but a small portion of the twig. PI. LXXVIII, Figs. 1, 4, nuist 



form portions of still larger twigs. Fig. 3 of this plate shows a sort of keel 



on the stem, probably due to shrinking. On this the leaves are not strictly 



distichous PI. LXXVII, Fig. 1, shows leaves of the greatest width. In 



Fig. 2 of the same plate the position of the leaves is due to distortion from 



pressure acting downwards. PI. LXXVl, Fig. 4, gives leaves of unusual 



Avidth On Fig. 5 of the same plate we see the scars left by the bud-scales 



of a terminal bud. PI. LXXVI, Fig. .S, shows at the top of the stem the 



bases of two lateral branches. It seems that this plant often continued the 



growth of its leafy branches by means of a terminal bud flanked by two 



lateral buds. On Fig. 5 there are indications at the place marked by the 



scars of the bud-scales that two lateral branches had been torn away. 



Befoi'e I saw the specimen depicted in Fig. 3 I supposed that the plant 



was a Podozaniites close to Zamitcs Giepperti Schenk.' In the character of 



the leaves it is much like this plant ; Schenk's plant is evidently much 



mutilated. 



Nageiopsis zamioides, sp. nov. 



Plate LXXIX, Figs. 1, 3 ; Plate LXXX, Figs. 1, 2, 4; Plate LXXXI, Figs. 1-6. 



Leafy twigs wide-spreading, copiously branching; leaflets varying a 

 good deal in length and width according to position, those at the base of 

 the branches sometimes unequal and much smaller than those up higher. 



'Fobs. Pflanzen der Wernsdorf. Scbichteu, PI. Ill, Fig. 6. 



