90 



THE AMERICAN BOTANIST 



1 Herbaceous plants (10) 



16 Leaves opposite (17) 



17 Stamens more than twice the niniiher of petals 



Pistils many, distinct, simple Ranunculaceae. (G. 302 



Pistils three to five somewhat united Ilypericaceae. (G. 570. 



17 Stamens not more than twice the numljer of petals (18) 

 IS Pistils one or several separate, simple 



Pistils one, petals six to nine Berberidaceae. (G. 411. 



Pistils more than one 



Pistils two ; juice milky Asclepiadaceae. (G. (]f>3. B. 740) 



B. 411) 

 B. 624) 



B. 432) 



Pistils three or more 



18 Pistils united (10) 



19 Ovary adherent to tlie calyx (20) 

 20 Carpels as many as sepals 



Anthers opening down the side 

 Antliers opening at apex 



Crassvilaceae. (G. 441. B. 473) 



Onagraceae. (G. 594. B. 051) 

 Melastomaceac. (G. 593. B. 650) 



20 Carpels fewer than sepals 



Ovary many s«eded ; styles two 

 Ovary one-seeded 

 Styles two or three 

 Style one 

 10()vary free from the calyx (21) 



21 Stamens as many as petals and opposite them 

 Style and stigma, one 

 Style one ; stigma three-cleft 

 21 Stamens alternate or of different number 

 22 Leaves toothed or lobed 



Flowers four-parted ; stamens six 

 Flowers five-parted; stamens ten 



22 Leaves entire 



Petals and stamens on the calyx 

 Petals and stamens on the receptacle 

 Flowers irregular 

 Flowers regular 



Two or three-parted 

 I'ive-parted 



Leaves dotted 

 Leaves without dots 



16 Leaves alternate or plants acaulescent (23) 



23 Stamens more than twice the nunibei of petals (24) 

 24 Stamens on the receptacle (25) 



25 Carpels several, distinct or unitfd at 

 Leaves not peltate 

 Some or all of the leaves jieltate 

 25 Carpls united (20) 



2() Petals numerous, sepals four to six 

 26 Petals four to eiglit (27) 

 27 Petals five only 



Convolute in bud: sepals five v 

 Imbricate in bud 



Sepals live, leaves tubular 

 Sepals two 



Saxifragaceae. (G. 444. B. 484) 



