ST. JOHN'S-WORT FAMILY. 83 



*+ *+ Pod plainly l-celled, with 3 parietal placenta. 

 = Leaves very narrow. 



H. dolabrif6rme, Vent. Branched from decumbent base 6'-20' high ; 

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

 oblong or ovate-lanceolate, i' long; pod ovate-conic, pointed. Ky. 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, 

 0. to Iowa and S. 



H. elllpticum, 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. virgatum, 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. pildsum, Walt. HAIRY S. Wet pine barrens S. Stem terete, 

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



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

 black dots. 2Z 



H. perforatum, Linn. COMJION 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 Eu., a troublesome weed in 

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



H. maculatum, 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. mtltilum, 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. gymnanthum, Engelm. & Gray. Stem almost simple, strict, l-3 

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



H. Canade"nse, Linn. Stem and branches strictly erect ; leaves linear 

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



*- H- 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. nudicaiile^Walt. ORANGE GRASS or PINEWEED. Leaves reduced to 

 minute, awl-shapetl, 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.') 2/ 



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

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



E. petiolata, Pursh. Taller ; leaves tapering into a short petiole ; 

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



