42 CLUSIACE^. (BALSAM-TREE FAMILY.) 



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

 capsule; stamens 6-12. (H. parviflorum, Muhl. H. quinquenervium, Walt.) 

 Ditches and low grounds, common. June-August. Stem 1 high. 

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



17. H. Canadense, L. Stems simple or branched, 4-anglod ; leaves lin- 

 ear or linear-lanceolate, the upper ones acute, sessile ; sepals lanceolate, acute, 

 longer than the petals, shorter than the oblong (brown) capsule. Wet sandy 

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

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



* * Flowers scattered on the slender branches : 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 branched ; leaves lin- 

 ear or the lower ones oblong, acute, appressed ; sepals barely 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 3-celled, 3-valved, many-seeded. Smooth perennial herbs. 

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



1. E. Virginica, 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- 

 oled, obscurely dotted beneath; stamens united above the middle. "With the 

 preceding. July and August. Stem 2 high. 



ORDER 19. CL,USIACE^E. (BALSAM-TREE FAMILY.) 



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

 dotless leaves articulated with the stem, and regular hypogynous flowers. 

 Sepals 3-6. Petals 4-9. Stamens mostly numerous, distinct or variously 

 united. Ovary 1 - many-celled, few - many-ovuled. Style single, often 

 none. Fruit capsular, baccate, or drupaceous. Seeds without albumen. 

 Embryo straight. Cotyledons thick, distinct or united. 



1. CLITSIA, L. 



Calyx 2-bracted, of 6 imbricated, colored sepals. Petals 4-9. Stamens nu- 

 merous, the filaments united at the base into a thick and fleshy tube. Ovary 



