UliXANDRIA MONOGYNIA 215 



B. Flowees incomplete. 

 a* Perianth corolla-like, f Flowers -with a Spathe. 



168. PONTEDERIA. L. Nutt. Gen. 315. 

 [In honor of Julius Pontedera, Professor of Botany at Padua.] 



Perianth tubular, G-cleft, bilabiate ; under side of the tube perforated 

 with 3 longitudinal clefts ; the base or lower half calycine, pereistent. 

 Stamens unequally inserted, 3 near the base, and 3 near the summit, 

 of the tube. Ovary superior. Utricle muricate, 1 -seeded. 



Herbaceous aquatics : leaves chiefly radical, sheathing at base, with parallel reins ; 

 flowers mostly h>spikes. Nat. Ord. 246. Lindl. Pontbdbbeji. 



1. P. cord vta, L. Leaves subradical, sagittate-cordate ; flowers in 

 crowded spikes. Beck, Bot. p. 368. 



Cordate Poxtedkria. Vulgo— Pickerel weed. 



Root perennial, fasciculate. Leaves 4 to 6 or 8 inches long, and 2 to 4 inehos wide* 

 tapering to the apex, but rather obtuse, entire, sagittate-cordate at base, petiolate, 

 glabrous, somewhat fleshy. Scape I to 2 feet long, bearing one leaf, with the base 

 of the petiole tubular and sheathing. Spathe oblong, just below the spike, sheath- 

 ing the stout pubescent peduncle. Plovers sessile, aggregated by Cwos ani tbreesi 

 in a terminal spike about 3 inches in length. Perianth with the limb bright blue, 

 bilabiate ; upper lip flat, 3-cleft, lobes oblong, one of them with a yellowish spot in 

 the centre; lower lip deeply 3-parted, lobes linear-oblong; tube greenish, calyx- 

 like, curved, pubescent, with 3 gashes, or slits, on the inner curve. Stamens about 

 as long as the perianth. Style shorter than the stamens. Utricle covered by the 

 persistent base of the perianth, with 6 crested undulate ridges. 



Bab. Margin of the Schuylkill, at Black Rock : rare. Fl. July— Aug. Fr. Sept. 



Obs. This has only been found along the Schuylkill, in this County,— where it 

 was collected by Mr. John Marshall, in 1829. It is very abundant in the 

 marshes, along the tide waters. One or two other species have been enumerated 

 in the United States ; which, however, Dr. Torrey considers as nothing more than 

 varieties. 



169. ALLIUM. L. JSTutt. Gen.247. 

 [Supposed to be from the Celtic, All ; signifying hot, or acrid.g 



Perianth 6-partcd, generally spreading. Filaments sometimes tricus- 

 pidate. Ovary superior. Capsule 3-celled, 3-valved, few-seeded. Spathe 

 membranaceous. 



Herbaceous: strongly odorous, when bruised ; bulbous at the root; leaves fistular 

 or flat j flowers in a dense terminal umbel, or head ; umbel in some species bulbi* 

 fcrous. Nat. ord. 247. Lindl. Asphodbleje. 



* Leaves fistular and terete. 



1. A. tine alb, L. Stem somewhat leafy; umbel often bulbifertus; 

 filaments alternately tricuspidate. Beck 9 Bot. p. 363. 



Vine Allium. Vulgd— Garlic. Field Garlic Crow Garlic. 



Gallice — Ail des Vignes. Germanice — Acker Lauch. 



