42 CLUsiACE^. (dalsam-tuee vamily.) 



lanceolate, mostly longer than the small ])etals, and equalling the (green) ovoid 

 capsule; stamens 6-12. (H. parviflorum, iluld. II. quinciuenervium, Walt.) 

 — Ditehcs anil low grounds, common. June -August. — Stem 1° high. 

 Branches of the cyme tiliform. Flowers very small, remote. 



17. H. Canadense, L. Stems simple or branclietl, 4-anglcd ; leaves lin- 

 ear or linear-lanceolate, the upper ones acute, scs.<ile ; stpals lanceolate, acute, 

 longer than the petals, shorter than the oblong (brown) capsule. — "Wet .^andy 

 places, Florida and northward. June -Oct. — Stem 4'- 12' high, with the 

 branches erect. Flowers small, copper-yellow. Stamens .5- 10. 



* * F/owers scattered on the slender hranchea : leaves minute. 



18. H. Sarothra, Michx. Stem much branched ; branches erect, filiform; 

 leaves minute, subulate, bract-like ; flowers small, sessile ; sepals scarcely half 

 as long as the lanceolate purple capsule. — Sandy old fields. Florida and north- 

 ward. June- August. — Stems 6'- 12' high. Stamens 5-10. 



19. H. Drummondii, Torr. & Gray. Stem much branche<l ; leaves lin- 

 ear or the luwcr ones oblong, acute, appressed ; sepals Ijarely shorter than the 

 ovate capsule; flowers pedicelled. — Dry barren soil, Florida, South Carolina, 

 and -westward. July and August. — Stems and branches stouter than the last. 

 Stamens 10-20. 



3. ELODEA, Adans. 



Sepals 5. Petals .5, equal-sided, imbricated in the bud. Stamens mostly 9, 

 and united in sets of three, with a scale-like gland between each set. Styles 3, 

 distinct. Capsule S-cellcd, 3-valved, many-seeded. Smooth perennial herbs. 

 Flowers rose-color, in contracted lateral and terminal cymes. 



1. E. Vil'ginica, Nutt. Leaves oblong or oval, cordate, clasping, con- 

 spicuously dotted beneath ; stamens united below the middle. — Swamps, Florida 

 and northward. July and August. — Stems terete, l°-2° high. 



2. E. petiolata, Pursh. Leaves oblong, narrowed at the base, short-peti- 

 olcd, obscurely d(jiti(l beneath; stamens united above the middle. — With the 

 preceding. July and August. — Stem 2° high. 



Order 19. CLUSIACE7E. (Balsam-Tree Family.) 



Trees or shrubs, with resinous yellow juice, opposite coriaceous entire 

 dotlcsa leaves articulated witli the stem, and reji;ular hyiwgynous flowers. 

 Si^paLs 3-6. Petals 4-9. Stamens mostly numerous, distinct or variously 

 united. Ovary 1 -many-celled, few- many-ovulcd. Style single, oflon 

 none. Fruit capsular, baccate, or drupaceous. Seeds witiiout alljuuien. 

 Embryo straight. Cotyledons thick, distinct or united. 



1. CLUSIA, L. 



Calyx 2-bractcd, of f. imbricated, colored sepals. lVtals4-0. St;nncns nu- 

 merous, the filaments united at the ba.se into a thick and lieshy tube. Ovary 



