215 d 
2509. Euphorbia stictospora Engelm. Bot. Mex. Bound. Surv. 187 
(185 
2510. Euphorbia zygophylloides Boiss. Cent. Euph. 10 (1860). 
CALLITRICHACE A: 
A 
1. CALLITRICHE L. Sp. Pl. 969 (1753). 
2511. Callitriche Austini Engelm. in A. Gray, Man. Ed. s, 428 
(1867). 
Callitriche terrestre Raf. Med. Rep. (IL) 5: 358 (1808)? 
Callitriche deflexa var. Austini Hegelm. Verh. Bot. Ver. 
Brand. 9: 15 (1867). 
2512. Callitriche bifida (L.) Morong. 
Callitriche palustris var. bifida L. Sp. PL 969 (1753). 
Callitriche autumnalis L. Fl. Suec. Ed. 2, 4 (1755). 
2513. Callitriche heterophylla Pursh, Fl. Am. Sept. 3 (1814). 
2514. Callitriche palustris L. Sp. Pl. 969 (1753). 
Callitriche verna L. Fl. Suec. Ed. 2, 4 (1755). 
EMPETRACEAZE.t 
I. COREMA Don, Edinb. New Phil. Journ. 15: 63 (1826-27). 
[Oakesta Tuckerm. in Hook. Lond. Journ. Bot. 1: 445 (1842).] 
2515. Corema Conradi Torr.; Lond. Encyc. Trees, 1092 (1842). 
Empetrum Conradi 'Torr. Ann. Lyc. N. Y. 4: 83 (1837). 
2. EMPETRUM L. Sp. Pl. 1022 (1753). 
2516. Empetrum nigrum L. Sp. Pl. 1022 (1753). 
BUXACEZE.Tt 
1. PACHYSANDRA Michx. Fl. Bor. Am. 2: 177, £ 45 (1803). 
2517. Pachysandra procumbens Michx. Fl. Bor. Am. 2: 178, 7. 
45 (1803). 
* Contributed by Dr. Thomas Morong. . 
+ Contributed by Prof. John M. Coulter. 
