20 ANALYTICAL KEY. 



Pistils 2 as to their ovaries, these making many-seeded pods, but J-AOB 



stigmas and often styles also united into one 

 Pollen powdery and loose, as in ordinary plants, not in 



masses DOGBANE F. 283 



Pollen all in waxy or granular masses, usually 10, and fixed 



in pairs to 5 glands of the stigma . MILKWEED F. 286 

 Pistil one, with a single compound ovary which is not divided 



nor deeply lobed 



Stamens on the receptacle, or lightly cohering above with 

 what seems to be the corolla : ovary 1-celled, 1-seeded, 



(Mirabilis) FOUR-O'CLOCK F. 358 

 Stamens on the receptacle, or nearly so : ovary 5-celled : pod 



many-seeded HEATH F. 262 



Stamens borne on very base of the 4-8-parted corolla : the 

 cells of the ovary just as many, one ovule in each: no 

 style : berry-like fruit containing as many little stones, 



HOLLY F. 102 

 Stamens plainly borne on the^ corolla 



Leaves all radical, 1-7-ribbed: flowers in a spike: co- 

 rolla thin and becoming dry : stamens 4 : style and 

 stigma one : pod 2-celled, rarely 3-celled, opening 

 transversely .... PLANTAIN F. 356 

 Leaves on the stem 



All opposite and entire, their bases or petioles con- 

 nected by small stipules or a transverse stipu- 

 lar line : ovary and pod 2-celled, several-seeded, 



LOGANIA F. 290 



All opposite or whorled and entire, without stipules : 

 ovary and pod 1-celled, several-many-seeded ; 

 placentae parietal 

 Juice milky : leaves short-petioled, 



(Allamanda) DOGBANE F. 283 

 Juice not milky, bitter : stem leaves sessile, 



GENTIAN F. 291 

 Alternate or some opposite, loithout stipules : ovary 



and pod 1-ceHed icith 2 parietal placentas 

 Smooth marsh or water plants: leaves round- 

 heart-shaped, entire, or of 3 entire leaflets, 



GENTIAN F. 291 



More or less hairy plants : leaves mostly toothed 

 or divided: style 2-cleft, 



WATERLEAF F. 298 



Opposite, no stipules: ovary 4-celled, 4-ovuled: 

 stamens 4 : style not 3-cleft, 



VERVAIN F. 339 



Opposite or alternate, simple or compound, without 

 stipules, not twining : ovary and pod 3-celled: 

 stamens 5 : style 3-cleft at the apex, 



POLEMONIUM F. 296 



Alternate, pinnate and tendril-bearing, lowest leaf- 

 lets imitating leafy stipules, 



(Cobjea) POLEMONIUM F. 295 

 Alternate, at least not opposite, without stipules : 



stamens 5, rarely 4: ovary 2-5-celled 

 Four cells of the ovary 1-ovuled : fruit splitting 

 into little nutlets : flower-clusters coiled, 



(Heliotrope) BORAGE F. 301 

 Two or three 2-ovuled or four 1-ovuled cells: 

 seeds large : mostly twiners, 



CONVOLVULUS F. 306 

 Two or rarely more many-ovuled cells : seeds 



numerous 

 Styles 2, or rarely 3, or 2-cleft, 



WATERLEAF F. 298 

 Style and stigma only one, 



NIGHTSHADE F. 311 

 Leaves none: leafless parasitic twiners, destitute of 



green herbage .... DODDER SUBF. 730 



