215 



2509. Euphorbia stictospora Engelm. Bet. Mex. Bound. Surv. 187 



(iS59)- 



2510. Euphorbia zygophylloides Boiss. Cent. Euph. 10 (i860). 



CALLITRICHACE^.* 



I. CALLITRICHE L. Sp. PI. 969 (1753)- 



251 1. Callitriche Austini Engelm. in A. Gray, Man. Ed. 5, 428 



(1867). 

 Callitriche terrestre Raf. Med. Rep. (II.) 5 : 358 (1808) ? 

 Callitriche deflexa var. Austini Hegelm. Verb. Bot. Ver. 

 Brand. 9 : 15 (1867). 



2512. Callitriche bifida (L.) Morong. 



Callitriche paliistris var. bifida L. Sp. PI. 969 (1753). 

 CallitricJie autinnnalis L. Fl. Suec. Ed. 2, 4 (1755). 



2513. Callitriche heterophylla Pursh, Fl. Am. Sept. 3 (1814). 



2514. Callitriche palustris L. Sp. PI. 969 (1753). 



Callitriche verna L. Fl. Suec. Ed. 2, 4 (1755). 



EMPETRACEiE.t 



I. COREMA Don, Edinb. New Phil. Journ. 15: 67, (1826-27). 

 [Oakesia Tuckerm. in Hook. Lond. Journ. Bot. i : 445 (1842).] 



2515. Corema Conradi Torr.; Lond. Encyc. Trees, 1092(1842). 



Empetrum Cotiradi Tow. Ann. Lye. N. Y. 4: 83 (1837). 



2. EMPETRUM L. Sp. PI. 1022 (1753). 



2516. Empetrum nigrum L. Sp. PI. 1022 (1753). 



BUXACE/E.t 



I. PACHYSANDRA Michx. Fl. Bor. Am. 2 : 177, /. 45 (1803). 



2517. Pachysandra procumbens Michx. Fl. Bor. Am. 2 : 178, /. 



45 (1803). 



* Contributed by Dr. Thomas Morong. 

 f Contributed by Prof. John M. Coulter. 



