PLANTS OF SOUTHERN NEW JERSEY. 551 



Order PARIETALES. 



Family HYPERICACE^. St. John's-worts. 

 a. Sepals 4, one pair narrower than the other, petals 4, yellow. 



b. Plant low, 1-2.5 dm. high, leaves sessile, flowers 15-25 mm. broad. 



Ascyrum hypericoides, p. 552 

 bb. Plant taller, 3-6 dm. high, leaves clasping, flowers 12-18 mm. broad. 



A. stans, p. 552 

 aa. Sepals and petals 5. 

 b. Petals yellow. 



c. Leaves reduced to minute appressed scales. 



Sarothra gentianoides, p. 557 

 cc. Leaves not reduced to scales. 



d. Styles 5, flowers 40-60 mm. broad. Hypericum ascyron, p. 552 

 dd. Styles 3 (rarely 4). 



e. Stamens numerous, always more than 12. 



/. Shrubby, 5-20 dm. high, flowers 8-12 mm. broad. 



H. densiftorum, p. 553 

 ff. Not shrubby, 2-9 dm. high. 



g. Stamens in three to five clusters, petals with black 

 dots or Hnes. 

 h. Leaves oblong or linear, 10-20 mm. long, dots 

 only in the margin of the petals. 



[H. perforatum]* 



hh. Leaves oblong, 20-80 mm. long, several rows of 



dots or lines on the petals. H. pimctahim, p. 555 



gg. Stamens not in clusters, petals without black dots. 



h. Leaves lanceolate or oblong, margins revolute. 



H. adpressum, p. 553 

 hh. Leaves elliptic or oval, spreading, flowers pale 

 yellow. H. ellipticum, p. 554 



hhh. Leaves oval, erect and appressed, flowers cop- 

 per yellow. H. virgatum ovalifolium, p. 554 

 ggg. Stamens 5-12. 



h. Flowers small, usually 4-5 mm. broad. 

 i. Cyme leafy-bracted, leaves elliptic. 



H. boreale, p. 555 

 a. Cyme subulate-bracted. 



y. Leaves ovate, oblong or elliptic. 



H. mutilum, p. 555 

 jj. Leaves ovate deltoid. 



H. gymnanthuni, p. 556 



///. Leaves Hnear obtuse. H. canadense, p. 556 



hh. Flowers 6-10 mm. broad, plants 3-9 dm. high. 



H. majus, p. 556 

 bb. Petals red purple, leaves ovate obtuse, plant 3-5 dm. high. 



* Common St. John's-wort, a weed. 



