20 ANALYTICAL KEY. 



Pistils 2 as to their ovaries, these making many-seeded pods, but i-ase 

 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 

 PistU 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.. 366 

 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 : 

 placenta parietal — 

 Juice milky : leaves short-petioled, 



(Allamanda) DOGBANE F. 283 

 Juice not milky, bitter : stem leaves sessile, 



GENTIAN F. 291 

 Alternate or some opposite, without stipules : ovary 

 and pod 1-celled with 2 parietal placentse — 

 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-clef t at the apex, 



POLEMONIUM F. 295 

 Alternate, pinnate and tendril-bearing, lowest leaf- 

 lets imitating leafy stipules, 



(Cobsea) 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 



