NO. 2229. FOSSIL PLANTS FROM BOLIVIA— BERRY. 129 



see in these forms any relation to Myrica and regard them as repre- 

 senting a species of Weinmannia, thus making two species of this 

 genus in the Potosi flora. It is well marked specifically from the 

 other species of Weinmannia, which is a smaller, more coarsely toothed 

 leaflet with a narrow base and rounded apex. 

 Plesioty pes. —Cat. No. 35126, U.S.N.M. 



Family MIMOSACEAE. 



Genus ACACIA Willdenow. 



ACACIA UNINERVIFOLIA Engelhardt. 



Plate 15, figs. 14, 15. 



Acacia uninervifolia Engelhardt, Sitz. Naturw. Geeell. Isis in Dresden, 1894, 

 Abh. 1, p. 11, pi. 1, figs. 10, 11, 20. 



Description. — Leaflets or phyllodes sessile, somewhat variable in 

 size, slightly or not at all inequilateral, lanceolate to linear lanceolate 

 in outline, with an equally acuminate apex and base. . Margins entire 

 Texture coriaceous. Length, ranging from 1 to 2.25 cm. Maximum 

 width, in the middle of the leaflet, ranging from 1 to 3.5 mm. Midrib 

 relatively stout and prominent on the lower surface of the leaflets. 

 Secondaries thin, numerous, regularly spaced and subparallel; about 

 15 pairs diverge from the midrib at angles of about 45°, curving 

 regularly upward and ultimately camptodrome. Tertiary venation 

 obsolete by immersion. 



This species is common at Potosi and also occurs sparingly at 

 Corocoro. It was described by Engelhardt* in 1894, who compared 

 it with the phyllodes of the existing Acacia paradoxa De Candolle. 

 Engelhardt's figure 20 shows a relatively shorter and wider form and 

 may represent a leaflet of Machaerium eriocarpoides Engelhardt. 



The present species is similar to Mimosites Engelhardti Berry, 

 Machaerium eriocarpoides Engelhardt, and Enterolohium grandifolium 

 Engelhardt. It is relatively longer and narrower than any of these 

 and may be readily distinguished by the accompanying illustrations 

 showing its extremes of size. 



Plesioty pes. —C&t. No. 35085, 35086, U.S.N.M. 



ACACIA DIMIDIATO-CORDATA Engelhardt. 



Plate 15, figs. 16, 17, 18. 



Acacia dimidiato-cordata Engelhardt, Sitz. Naturw. Gesell. Isis in Dresden, 1894 , 

 Abh. 1, p. 11, pi. 1, fig. 51. 



Description. — Leaves even pinnate, leaflets small, sessile, elliptica 

 m outline, with a rounded apex and an inequilateral base. Margins 

 full and rounded, entire. Texture subcoriaceous. Length ranging 

 from 2 to 8 mm. Maximum width ranging from 1 to 4 mm. Midrib 



« Sitz. Naturf. Gesell. Isis in Dresden, 1894, Abh. 1, p. 11. 

 3343— 19— Proe.N.M. vol.54 10 



