1 66 NEW YORK STATE MUSEUM 



Key to the New York State Species of the Saint John's-wort Family 



Sepals four, in unequal yjairs; petals also four 



Stems erect, i to 2 feet high; leaves clasping, styles three to four 



I A s c y r u m s t a n s 



Stems diffusely branched, 5 to 10 inches high; leaves sessile; styles two 



2 Ascyrum hypericoides 

 Sepals and petals usually five 



Petals pink or greenish ]jurple, imbricated in the bud; leaves sessile; capsules red- 

 purple 3 T r i a d e n u m v i r g i n i c u m 



Petals yellow, convolute in the bud 



Leaves reduced to minute appressed scales ...4 Sarothra gentianoides 

 Leaves normal 



Styles five, large perennials 



Flowers i to 2 inches broad; capsules three-fourths of an inch long 



5 Hypericum ascyron 

 Flowers one-half to i inch broad; capsules about one-half of an inch 



long 6 Hypericum k a 1 m i a n u m 



Stvles three or rarely four 



Tall leafy shrubs with numerous flowers 



Flowers one-half to three-fourths of an inch broad; pods one-third 



to one-half of an inch long ... 7 Hypericum p r o 1 i f i c u m 



Flowers one-third to one-half of an inch broad; pods one-sixth to 



one-fourth of an inch long. . . 8 Hypericum d e n s i f 1 o r u m 



Herbaceous perennials, or woody at the base only 



Stamens numerous (fifteen to forty); flowers one-fourth to i inch 

 broad 

 Capsules one-celled or incompletely three to four-celled 



Capsules incompletely three to four-celled by the pro- 

 jecting placentae; leaves oblong 



9 Hypericum adpressum 

 Capsules strictly one-celled; placentae parietal; styles 



united into a beak, separate above; leaves elliptic 



10 Hypericum e 1 1 i p t i c u m 

 Capsules completely three-celled; styles separate 



Leaves linear or oblong; sepals lanceolate. Introduced 

 from Europe 11 Hypericum perforatum 



