4.4.6 AL1SMACE.E. (M'ATKU-I'LANTAIX FAMILY.) 



short. Achenium I -seeded, 2-8-keeled on the back. — Hoots fibrous. Leaves 

 mostly oval or cordate, nerved, shorter than the scape. Flowers white. 



1. A. Plantago, L. Leaves long-petioled, ovate or oblong, acute, rounded 

 or cordate at the base, 3-9-nerved ; panicle large, lax, the whorled branches and 

 elongated filiform pedicels bracted at the base; aehenia ohtuse, 15-20 in a 

 whorl. (A. trivialis, and A. parviflora, Pursh.) — Ditches and margins of ponds 

 in the upper districts, Georgia, and northward. July and Aug. — Leaves 2'-4' 

 long. Panicle 1 ° - 2° long. 



3. ECHINODORUS, Eiehard. 



Flower-; perfect, mostly in whorled raeemes. Sepals 3. Petals 3, imbricated 

 in the bud, withering. Stamens few or numerous. Ovaries few or many, im- 

 hrieated, funning ribbed aehenia in fruit, usually beaked with the persistent 

 Style. — Herbs, with petioled nerved leaves. Heads mostly bur-like. 



1. E. parvulus, Engelm. Small; leaves laneeolate or spatnlate, nio>tly 

 acute, finely nerved and somewhat pinnatelv-vcincd, commonly shorter than the 

 single or clustered 1 - 6-flowered scapes; flowers mostly clustered or umbelled, 

 on long bracted pedicels which are recurved in fruit, Stamens 9; aehenia few, 

 shorter than the ovate sepals, obovate, flattened at the sides, and surrounded 

 with 5 prominent ribs, beakless. — Margins of shallow ponds, Middle Florida, 

 and westward. July and Aug. — Scapes l'-4' high. Aehenia black and 

 shining. 



2. E. l'OStratUS, Engelm. Leaves varying from lanceolate to ovate, acute 

 at each end, or rounded or cordate at the base, 5-ncrved, about as long as the 

 petiole; scape rigid, erect, longer than the leaves; whorls few; pedicels erector 

 spreading; sepals ovate, manynerved, Bhorterthan the oval bur-like head ; sta- 

 mens 12; style longer than the ovary; aehenia numerous, Btrongly :i ribbed on 

 the back, with fainter lateral and intermediate ribs, beaked with the long persist- 

 ent style. — South Florida, and westward. — Scape simple, 3'- 8' high, or oc- 

 casionally 2° high and paniculately branched. Leaves l'-2' long. Flowers 5" 



wide. 



3. E. radicans, Engelm. Leaves large, long-petioled, ovate, cordate or 

 truncate at tin- base, obtuse, 7-9-ribbed; scape elongated, prostrate, rooting and 

 proliferous; whorls several, remote; pedicels Blender, spreading, or recurved; 

 BtamenB about 20 ; style shorter than the ovary ; heads globose, longer than the 

 many-nerved sepals ; aehenia very numerous, Bhort-beaked, ribbed and slightly 



denticulate on the back. (Alisma radicans, Xutl.) — Swamps, Florida to North 

 Carolina, and westward. July - Sept. — Scape 2° -4° long Leaves 3' -8' long. 

 flowers x"- 12" wide. 



4. SAGITTARIA, L. Abrow-gbasb, 



Flower- monoecious, in a whorled raceme, die upper one- sterile. SepalBS, 



tent. Petals 3, imbricated in the bud, withering. Stamen- few or many. 



Ovaries crowded In s globular head. Aehenia Bat, membranaceous, fringed. — 



Marsh or aquatic herbs, with scape like stoma, ami variously-shaped nerved and 



