20 ANALYTICAL KEY. 



Pistils 2 as to their ovaries, these makinc/ many-seeded pods, but i"age 

 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 grannlar masses, usually 10, and fixed 



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

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

 nor deeply lobed — 

 Stamens on the receptacle, or lightly cohering ahove with 

 what seems to be the (corolla: ovary l-celled, l-sccdcd, 



(iMirabilis) FOUK-OCLOCVK F. 358 

 Stamens on the receptacle, or nearly so : ovary 5-c(dled : 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 

 Starnens 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, 



LOGAN i A F. 290 

 All opposite or whorled and entii-e, vrithitut stipules : 

 ovary and pod 1-celled, several-mujiy-scedcd : 

 placentSB parietal — 

 Juice milky : leaves short-petioled, 



(Allamanda) DOGBANE F. 283 

 Juice not milkv, bitter : stem leaves sessile, 



(GENTIAN F. 291 

 Alternate or xn 111'' (i/jpusl/i', vitlionf st;,u/ps .- ovary 



andpn,/ l-rr/lr,l irilh '2 luirirf a //,/,!,;■ uftr, — 



Smootli marsh i>v waiev plants: leaves round- 

 heart-shaped, entire, or of IJ 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. 295 

 Alternate, pinnate and tendril-bearing, lowest leaf- 

 lets imitating leafv stipules, 



(Cobira) POLEMONIUM F. 295 

 Alternate, at least not opposite, vithont stipules: 

 stamens 5, rarely 4: orury 2-5-cpllpd — 

 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 

 Tivo or rarely more many-orided 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 SURF. 7.'50 



