134 THE AMERICAN MIDLAND NATURALIST. 
ALSINE MACROTHECA (Hornem.) Arenaria macrotheca 
Hornem.; Tissa macrotheca Britton 
ALSINE LEUCANTHA (Greene) Tissa leucantha Greene 
ALSINE GREENEI, nom. nov. Tvissa pallida Greene; Britton 
Torr. Club Bul. (16) : 128. 1889. Not Alsine pallida Dum. 
ALSINE VALIDA (Greene) Tissa valida Greene 
ALSINE LUTEOLA (Greene) Tissa luteola Greene 
ALSINE MEXICANA (Hemsl.) Spergularia mexicana 
Hemsl.; Tissa mexicana Britton 
ALSINE PLATENSIS (Cambess) Balardia platensis Cambess; 
Lepigonium gracile S. Wats.; Spergularia platensis Fenzl.; 
Tissa gracilis Britton; Spergularia gracilis Robinson. 
ALSINE BRACTEATA (Robinson) Spergularia salsuginea var. 
bracteata Robinson; S. diandra Robinson; Tissa bracteata 
Small. 
ALSINE SPARSIFLORA (Greene) Tissa sparsiflora Greene 
ORTHILIA Raf. Aut. Bot. 103. 1840. 
Ramischia Opiz, Seznam 82. 1852. 
Actinocyclus Klotzsch,, Akad. Monats Berlin (1857): 14. 1857. 
ORTHILIA SECUNDA (L.) House, comb. nov. 
Pyrola secunda L. Sp. Pl. 396. 1753. 
R. secundiflora Opiz, 1. ¢. 
Actinocyclus secundus Klotzsch, 1. c. 
R. secunda Garcke, Fl. Deuts. Ed. 4, 222. 1858. 
O. parvifolia Raf., 1. ¢. 
In our northern swamps, merging into the var. OBTUSATA 
(Turcez.) House, comb. nov. (Pyrola secunda var. obtusata 
Turcz.), originally described from northern Asia and Europe, 
but which appears to be practically the same as described by 
Paine (Cat. Pl. Oneida County 135. 1865), as var.. pumila. 
All intermediate forms between the typical species and the 
var. obtusata, occur in a swamp near Newcomb, New York. 
An additional species of this genus occurs in Mexico. 
ORTHILIA ELATIOR (Lang) House, comb. nov. (Actinocyclus 
secundus elatior Lange; Ramischia elatior Rydberg), 
BRAXILIA Raf. Aut. Bot. 102. 1840. 
Eralebenia Opiz, Seznam 41. 1852. 
Amelia Alef. Linnaea (28): 25. 1856, 
