ST. JOHNS-WORT FAMILY. 83 



*+ -^ Pod plainly 1-celled, with 3 parietal placentae. 

 = Leaves very narroto. 



H. dolabrifdrme, Vent. Branched from decumbent base 6'-20' high ; 

 leaves linear-lanceolate, mostly acute ; cyme few flowered, leafy ; sepals 

 oblong or ovate-lanceolate, h' long ; pod ovate-conic, pointed. Kv. and 

 Tenn. 



H. cistif61ium, Lam. Cistus-leaved S. Nearly simple, l°-2° high ; 

 leaves diverging, oblong-linear (2' long), mostly obtuse ; flowers numerous, 

 small, in a naked flat cyme ; sepals ovate ; pod globular. Rocky banks, 



= = Leaves elliptic or nearly ovate. 



H. ellipticum. Hook. Elliptical-leaved S. 10'-20' high ; leaves 

 spreading, oblong, thin ; flowers rather few, pale ; sepals oblong ; the pod 

 purple, ovoid, very obtuse. Wet soil, N. 



H. virg^tum. Lam. Branchy S. Wet pine barrens from New Jersey 

 S. Stem sharply 4-angled (l°-2° high), smooth ; leaves ovate or lance- 

 oblong ; flowers scattered along the ascending branches of the cyme, 

 small, copper-yellow ; styles slender. 



H. pil6sum, Walt. Hairy S. Wet pine barrens S. Stem terete, 

 and with the lance-ovate leaves roughish-downy ; styles short. 



* * * Stamens many in S or 5 clusters ; styles 3, not united ; petals with 



black dots. 21 



H. perforatum, Linn. Co:mmon S. Upright stems branching ; leaves 

 oblong or linear- oblong, with pellucid dots ; flowers rather large, in open 

 leafy cymes ; the deep yellow petals twice the length of the lanceolate, 

 acute sepals; juice very acrid. Nat. from J^u., a troublesome weed in 

 fields, etc. ; spreads by runners from the base. 



H. maculitum, Walt. Spotted S. Stem 2° high, sparingly branched ; 

 leaves oblong, slightly clasping, having black as well as pellucid dots ; 

 flowers rather small, crowded ; petals light yellow and black-lined as well 

 as dotted ; sepals oblong ; styles not longer than the pod. Common. 



* * * » Stamens definite (5-12), distinct or in 3 clusters ; styles 3, not 



united; stems 4-angled. 



+- Leaves conspicuous and spreading ; flowers in cymes. 



H. miitiluin, Linn. Small S. Slender, much-branched and leafy up 

 to the flowers, 6'-20' high ; leaves partly clasping, thin, 5-nerved, ovate 

 or oblong ; petals pale yellow. Common in low grounds. 



H. gymn^thum, Engelm. & Gray. Stem almost simple, strict, l°-3° 

 high ; leaves clasping, the floral ones reduced to awl-shaped bracts. 



H. Canad^nae, Linn. Stem and branches strictly erect ; leaves linear 

 or lanceolate, 3-nerved at the base ; petals copper-yellow. Wet sandy soil. 



■t- -4- Leaves erect, awl-shaped or scale-like and minute ; flowers very 

 small and scattered along the numerous bushy and wiry slender branches. 



H. Drummdndii, Torr. & Gray. Leaves linear-awl-shaped ; flowers 

 short-pediceled ; pods not longer than the calyx. 111., W. and S. 



H. nudicatile, Walt. Orange Grass or Pineweed. Leaves reduced to 

 minute, awl-shaped, appressed scales ; flowers sessile on the wiry branches ; 

 slender pods much exceeding the calyx. Common in dry, sterile soil. 



3. ELODES, MARSH ST. JOHN'S-WORT. (Greek: marsh.) 11 



E. campanulita, Pursh. l°-2° high ; leaves closely sessile or clasp- 

 ing by a liroad base ; filaments united below the middle. Swamps. 



E. petiol^ta, rursh. Taller; leaves tapering into a short petiole; 

 filaments united beyond the middle. Va., S. and W. 



