480 LYTHRACE^. Ammannia. 



- ' H. Nuttallii.—F c\)\is 1 diandra, Nuit. ! in DC. prodr. 3. ^;. 77. Ptilina 

 aquatica, Nutt. ! mss. 



In slow-flowing streams and ponds, Arkansas, Nuttall ! Texas, Drum- 

 moncl! Lincolnton, N. Carolina, Mr. Curtis! lllinoh, Mr. Buckley .' June- 

 Aug. — Stems 1-2 feet in length, very leafy, wlioUy immersed, or with the 

 summit floating. Leaves about an inch long, narrowly linear, acute ; the 

 uppermost, when floating, rather shorter and broader, obtuse, indistinctly 

 veined. Flowers not larger than a pin's head. Calyx slightly plaited 

 between the lobes. Stamens 2, or frequently 4, shorter than the calyx. 



2. AMMANNIA. Houst. in Linn. gen. ; Lam. ill. L 77 ; W. Sf Am. 

 jnodr. Ind. Or. l.p. 304 (excl. § 1 c^S?) 



Calyx more or less campanulate, 4-5-toothed or lobed ; the sinuses usually 

 expanding into spreading accessory teeth or horns. Petals as many as the 

 lobes of the calyx, or often wanting. Stamens as many or sometimes twice 

 as many as the lobes of the calyx. Ovary 2-4-celled : style short, or rather 

 long : stigma capitate. Capsule globose or ovoid, included in the calyx, 

 either bursting transversely or opening by valves. Seeds numerous, attach- 

 ed to thick central placenta3. — Herbaceous mostly glabrous annual plants, 

 growing in wet places, with square stems, and opposite entire leaves. Flow- 

 ers axillary, sessile or somewhat peduncled, bracteolate : petals small. 



§ Calyx ^-angled or plaited, ivitli 4 short lobes and as many small spread- 

 ing horn-like processes : pietals 4 {purplish) caducous : stamens 4 : capsule 

 ^-celled. — Ammannla propter, Am. 



/'\. A. latifolia (JAxm.) : stem erect; leaves linear-lanceolate, elongated, 

 ' acute, dilated and obtusely cordate-auriculate at the base, closely sessile ; 

 flowers 1-5 in each axil (somewhat pedunculate, at least when solitary) ; 

 style more than half the lengtli of the capsule. — Linn. spec. l.p. 119; Lam. 

 ill. t. n,f. 1; Willd.! spec. 1. p. 678; DC. prodr. 3. p. 78; Hook. cV 

 Am.! in compan. to hot. mag. 1. p. 46. A. ramosior, Linn. mant. j)' 332 ? 

 Willd. ! I. c. not of Linn. spec. 



Wet places, Illinois, Mr. Buckley! St. Louis, Drummond! Louisiana, 

 Dr. Ingalls ! Arkansas, Dr. James ! Dr. Pitcher ! July-Sept. — Stem 

 6-24 inches high, branching. Leaves 2-3 inches long; the uppermost often 

 narrowly linear. Bracteoles minute. We suspect this also occurs in the 

 Southern Atlantic States. 



2. A. hiimilis (Michx.) : stem branched from the base, ascending ; leaves 

 linear-oblong or lanceolate, obtuse, tapering at the base into a short petiole ; 

 flowers solitary in the axils of the leaves, closely sessile ; style very short, 

 or almost none.— Michx. ! fl. 1. p. 99 ; Ell. sk. 1. p. 218 ; Torr. ! fl. 1. p. 

 189; DC! I.e. A. ramosior, Linn. spec. \. p. 120; Walt. Car. p. 88; 

 not of Linn. mant. Sf subsequent authors. 



0. leaves mostly sessile, narrowed below, but more or less cordate-sagit- 

 tate at the base ; flowers about 3 in each of the lower axils, solitary above. — 

 A. ramosior, Michx. ! I. c. (at least partly) ; Ell. I. c. ; DC. ! I. c. A. pur- 

 purea, Lam. diet. 1. p. 131, fide DC. 



In wet places, Connecticut! and New York! (near the coast) to Georgia! 

 and Louisiana ! Also Oregon, on the Wahlamet, Nuttall ! P. New Jersey ! 



