KMT. 159 



in open naked cymes (rarely in close heads, surrounded by a 

 showy, corolla-like involucre). Trees, shrubs, or herbs. 



Comus (698). 

 Fruit a pod, globular, or short and 4-sided, cubic. 

 Leaves mostly alternate, rarely opposite, lanceolate, rarely 

 ovate. Flowers axillary, yellow, or reddish. 



Ludwigia (700). 



278. Style 1 .279 



Styles 2. Petals strap-shaped. Stamens 8, but 



only 4 of them perfect 129 



. Styles 2, divergent. Petals 4 (or 5), ovate. Calyx 

 hemispherical, 4- (or 5-) toothed, somewhat adhei-ent. Petals 

 4 (or 5). Stamens 8 (or 10). Flowers rarely all fertile, per- 

 fect, and complete. Often also marginal and radiant ones 

 present, consisting merely of a broad, rotate, 4-lobed, colored 

 calyx, lacking petals, stamens, and pistils. Pod opening by 

 a hole between the styles. Shrubs. Leaves opposite, ovate, 

 rarely cordate, pointed, serrate. Inflorescence cymose. 



Hydrangea arborescens, L. 



379. Ovary hemispherical or globular. Fruit a berry or a 

 pod 280 



Ovary oblong or linear. Fruit a pod, 4-celled 

 (4-valved or indehisoent), rarely at length 1-celled 281 



380. Ovary hemispherical. Fruit a berry. (Oxycoccus). 



514 

 Ovary globular. Fruit a 4-celled pod, with 4 

 central, prominent placentje. Seeds many. Petals oblique, 

 inserted with the stamens at the summit of the 4-cleft calyx- 

 tube. Anthers oblong or linear, 1-celled, opening by termi- 

 nal pores, and sometimes spurred at the back. Leaves oppo- 

 site, 3- to 5-nerved, ovate-oblong, or lanceolate. Stem terete, 

 or square, often winged along the angles. Rhezia. 



281. Calyx-tube not prolonged beyond the ovary. . . .282 

 Calyx-tube prolonged beyond the ovary. Leaves 



always alternate i 283 



282. Seeds with a large downy tuft at the apex. Leaves 

 chiefly opposite, at least the lower ones, or scattered. Pod 

 linear. Flowers violet, purple, or white. lEpilobiuiu. 



Seeds not coniose, but naked. Leaves alternate, 



