LYTHUACE.E. (LOOSESTRIFE FAMILY.) 133 



Augu'Jt. Stem 1°-1|° higli. Leaves rarely 1' long. Flowers I'-lj' in 

 diameter. 



6. B,. serrulata, Nutt. Low ; stem simple, 4-anglecl, smootli ; leaves 

 smooth above ; calyx glandular-bristly ; cyme leafy, 1 - 6-flowered. — Open flat 

 pine barrens, near the coast, Florida, Georgia, and westward. July and August. 

 — Stem 2' -6' high Leaves and flowers smaller than in the preceding. 



-I- H- Flowers yelloio. 



7. R. lutea, Walt. Stem at length much l)ranched, 4-angled, bristly ; 

 leaves smoothish, bristly serrulate, tiie lower ones obovate and obtuse, the upper 

 lanceolate and acute ; cymes numerous ; calyx short and smooth ; flowers 

 small. — Pine-barren swamps, Florida to North Carolina, and westward. July 

 and August. — Stem 1° high. Petals more persistent than those of the other 

 species. 



Order 52. LYTHRACE^. (Loosestrife Family.) 



Chiefly herbs, witli opposite or -whorled and entire leaves, without stip- 

 ules. Flowers mostly axillary. — Calyx tubular, persistent, 4 - 7-toothed, 

 free from tlie 2 - 4-celled ovary. Petals as many as the teeth of the calyx 

 and inserted into its throat, deciduous, sometimes wanting. Stamens as 

 many as the petals, or 2-4 times as many, inserted below the petals. 

 Anthers short, iutrorse. Style solitary. Capsule enclosed in the calyx, 

 1 - 4-celled, few or many-seeded. Placentie central. Seeds anatropous, 

 without albumen. — Sinuses of the calyx often api)endaged. Stigma capi- 

 tate, or rarely 2-lobed. 



Synopsis. 



* Calyx regular. 



1. IIYPOBRYCIITA. Calyx hemispherical. Petals none. Stigma 2-lobed. Capsule 2-celled 



2. AMM.\NNIA. Calyx campanulate. Stigma capitate. Capsule 4-cellcd. 



3. LYTIIRUM. Calyx cylindrical, striate. Capsule oblong, 2-cellr(l. 



4. NES.i;A. Calyx short, even. Capsule globose, 3- 5-celled- St,.^i;:eus 10. 



* * Calyx gibbous at the base. 



5. CUPIIEA. Calyx tubular, 12-ribbed. Stamens mostly 12. Capsule early ruptured. 



1. HYPOBRYCHIA, M. A. Curtis. 



Calyx hemispherical or campanulate, 4-lobed. Petals none. Stamens 2-4. 

 Style very short: stigma 2lobcd. Capsule globose, 2-ccl led. — A submerged 

 aquatic herb, with long filiform stems, opposite crowded pellucid linear leaves, 

 and minute sessile axillary flowers. 



1. H. Nuttallii, Torr. &, Gray. — Ponds and still water, "West Florida to 

 North Carolina, and westward. June- Aug. —Stems I°-2° long. Leaves 1' 

 long, acute. Flowers not larger than a pin's liead. 

 12 



