OCTANDRIA.— MONOGYNIA. 165 



tricose calyx. Recept. lunulate, pedicellate. 

 Seeds numerous. 



269. (ENOTHERA. Cal. tubular, 4-cleft; segments 



deflexed, deciduous. Pet. 4. Stig. 4-cleft. 

 Caps. 4-celled, 4-valved. Seeds naked, affixed 

 to a central, 4-sided receptacle. 



270. GAURA. Cal. 4-cleft, tubular. Cor. 4-petalled, 



ascending. Nut quadrangular 1 -seeded. 



271. EPILOB1UM. Cal 4-cleft, tubular. Cor. 4-petal- 



led. Caps, oblong, inferior. Seeds comose. 



272. OXYCOCCUS. Cal. superior, 4-toothed. Cor. 



4-parted; segments sublinear, revolute. Filam. 

 connivent ; Anth. tubular, 2-parted. Berry 

 many-seeded. 



** Flowers inferior. 



J73. MENZIESIA. Cal. 1-leaved. Cor. monopeta- 

 lous, ovate. Filam. inserted into the receptacle ; 

 anth. awnless. Caps, superior, 4-celled ; dis- 

 sepiments formed by the inflexed margins of the 

 valves. Seeds numerous, oblong. 



274. ACER. Flowers mostly polygamous. Cal. 5- 



cleft. Pet. 5 or 0. Samaras 2, winged, united at 

 the base, by abortion 1- seeded. 



275. DIRCA. Cal. 0. Cor. tubular ; border obsolete. 



Stam. unequal, exserted. Berry 1-seeded. 

 27G. JEFFERSONIA. Cal. 4— 5-leaved. Cor. 8-pe- 

 talled. Caps, obovate, substipitate 1-celled, 

 opening below the summit by a semicircular 

 foramen. Seeds numerous, arillate at the base, 



TRIGYNIA. 



J77. POLYGONUM. Perianth 5-parted, petaloid, in 

 ferior. Nut 1-seeded, mostly angular. 



MONOGYNIA. 



18, R1JEXIA. Melaslomacece. 



I. It. virginica: stem with winged angles, somewhat 

 hairy ; leaves sessile, ovate-lanceolate, serrate 



