1 66 NEW YORK STATE MUSEUM 



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

 Sepals four, in unequal pairs; 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 A s c y r u m h \- p e r i c o i d e s 

 Sepals and petals usually five 



Petals pink or greenish purple, 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 Ijud 



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

 Leaves nonnal 



Styles five, large perennials 



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



5 Hypericum a s c y r o n 

 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 



Styles 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 prolificum 



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 7 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 |) t i c u m 

 Capsules completely three-celled; styles separate 



Leaves linear or oblong; sepals lanceolate. Introduced 

 from Europe 11 Hypericum perforatum 



